Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge
A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of th...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Lefkowitz, Joseph K. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Schlagwörter: |
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| Umfang: |
12 |
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| Übergeordnetes Werk: |
Enthalten in: Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments - Lloyd, C.E.M. ELSEVIER, 2014, the journal of the Combustion Institute, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:162 ; year:2015 ; number:6 ; pages:2496-2507 ; extent:12 |
| Links: |
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| DOI / URN: |
10.1016/j.combustflame.2015.02.019 |
|---|
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ELV029285852 |
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| 245 | 1 | 0 | |a Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge |
| 264 | 1 | |c 2015transfer abstract | |
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| 520 | |a A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. | ||
| 520 | |a A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. | ||
| 650 | 7 | |a Plasma assisted combustion |2 Elsevier | |
| 650 | 7 | |a Plasma assisted ignition |2 Elsevier | |
| 650 | 7 | |a Non-equilibrium plasma |2 Elsevier | |
| 650 | 7 | |a Flame propagation |2 Elsevier | |
| 650 | 7 | |a Aircraft propulsion |2 Elsevier | |
| 700 | 1 | |a Guo, Peng |4 oth | |
| 700 | 1 | |a Ombrello, Timothy |4 oth | |
| 700 | 1 | |a Won, Sang Hee |4 oth | |
| 700 | 1 | |a Stevens, Christopher A. |4 oth | |
| 700 | 1 | |a Hoke, John L. |4 oth | |
| 700 | 1 | |a Schauer, Frederick |4 oth | |
| 700 | 1 | |a Ju, Yiguang |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Lloyd, C.E.M. ELSEVIER |t Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments |d 2014 |d the journal of the Combustion Institute |g Amsterdam [u.a.] |w (DE-627)ELV018057144 |
| 773 | 1 | 8 | |g volume:162 |g year:2015 |g number:6 |g pages:2496-2507 |g extent:12 |
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10.1016/j.combustflame.2015.02.019 doi GBV00000000000202A.pica (DE-627)ELV029285852 (ELSEVIER)S0010-2180(15)00070-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Lefkowitz, Joseph K. verfasserin aut Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. Plasma assisted combustion Elsevier Plasma assisted ignition Elsevier Non-equilibrium plasma Elsevier Flame propagation Elsevier Aircraft propulsion Elsevier Guo, Peng oth Ombrello, Timothy oth Won, Sang Hee oth Stevens, Christopher A. oth Hoke, John L. oth Schauer, Frederick oth Ju, Yiguang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:162 year:2015 number:6 pages:2496-2507 extent:12 https://doi.org/10.1016/j.combustflame.2015.02.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 162 2015 6 2496-2507 12 045F 620 |
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10.1016/j.combustflame.2015.02.019 doi GBV00000000000202A.pica (DE-627)ELV029285852 (ELSEVIER)S0010-2180(15)00070-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Lefkowitz, Joseph K. verfasserin aut Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. Plasma assisted combustion Elsevier Plasma assisted ignition Elsevier Non-equilibrium plasma Elsevier Flame propagation Elsevier Aircraft propulsion Elsevier Guo, Peng oth Ombrello, Timothy oth Won, Sang Hee oth Stevens, Christopher A. oth Hoke, John L. oth Schauer, Frederick oth Ju, Yiguang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:162 year:2015 number:6 pages:2496-2507 extent:12 https://doi.org/10.1016/j.combustflame.2015.02.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 162 2015 6 2496-2507 12 045F 620 |
| allfields_unstemmed |
10.1016/j.combustflame.2015.02.019 doi GBV00000000000202A.pica (DE-627)ELV029285852 (ELSEVIER)S0010-2180(15)00070-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Lefkowitz, Joseph K. verfasserin aut Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. Plasma assisted combustion Elsevier Plasma assisted ignition Elsevier Non-equilibrium plasma Elsevier Flame propagation Elsevier Aircraft propulsion Elsevier Guo, Peng oth Ombrello, Timothy oth Won, Sang Hee oth Stevens, Christopher A. oth Hoke, John L. oth Schauer, Frederick oth Ju, Yiguang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:162 year:2015 number:6 pages:2496-2507 extent:12 https://doi.org/10.1016/j.combustflame.2015.02.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 162 2015 6 2496-2507 12 045F 620 |
| allfieldsGer |
10.1016/j.combustflame.2015.02.019 doi GBV00000000000202A.pica (DE-627)ELV029285852 (ELSEVIER)S0010-2180(15)00070-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Lefkowitz, Joseph K. verfasserin aut Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. Plasma assisted combustion Elsevier Plasma assisted ignition Elsevier Non-equilibrium plasma Elsevier Flame propagation Elsevier Aircraft propulsion Elsevier Guo, Peng oth Ombrello, Timothy oth Won, Sang Hee oth Stevens, Christopher A. oth Hoke, John L. oth Schauer, Frederick oth Ju, Yiguang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:162 year:2015 number:6 pages:2496-2507 extent:12 https://doi.org/10.1016/j.combustflame.2015.02.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 162 2015 6 2496-2507 12 045F 620 |
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10.1016/j.combustflame.2015.02.019 doi GBV00000000000202A.pica (DE-627)ELV029285852 (ELSEVIER)S0010-2180(15)00070-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Lefkowitz, Joseph K. verfasserin aut Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. Plasma assisted combustion Elsevier Plasma assisted ignition Elsevier Non-equilibrium plasma Elsevier Flame propagation Elsevier Aircraft propulsion Elsevier Guo, Peng oth Ombrello, Timothy oth Won, Sang Hee oth Stevens, Christopher A. oth Hoke, John L. oth Schauer, Frederick oth Ju, Yiguang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:162 year:2015 number:6 pages:2496-2507 extent:12 https://doi.org/10.1016/j.combustflame.2015.02.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 162 2015 6 2496-2507 12 045F 620 |
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Enthalten in Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments Amsterdam [u.a.] volume:162 year:2015 number:6 pages:2496-2507 extent:12 |
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Enthalten in Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments Amsterdam [u.a.] volume:162 year:2015 number:6 pages:2496-2507 extent:12 |
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Geographie Anthropogeographie: Allgemeines Geomedizin |
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Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge |
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A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. |
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A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. |
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A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system. |
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The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5kHz), ignition kernels formed by the discharge are each transported away from the discharge gap before the following pulse arrives. At higher pulse-repetition frequencies (⩾10kHz), multiple pulses are all coupled into a single ignition kernel, thus the resulting ignition kernel size and the total energy deposition into the kernel are increased, resulting in a faster transition into a self-propagating flame. Imaging of the NRP discharge in air revealed that at high pulse frequencies (>10kHz) and peak pulse amplitude (>9kV), the plasma emission is not quenched in-between pulses, resulting in a building up of heat and radicals in the center of the ignition kernel. Optical emission spectra revealed the presence of electronically excited N2, O, and N, as well as O+ and N+, during and between the discharge pulses. Numerical modeling of the plasma indicated that reactions of excited species mainly lead to the production of O atoms and the increase of gas temperature, which shortens induction chemistry timescales, and thus reduces the flame-development time through both kinetic and thermal mechanisms. Ignition of aviation gasoline–air mixtures by NRP discharge in a PDE also demonstrated a noticeable reduction in ignition time as compared to an automotive aftermarket multiple capacitive-discharge ignition system.</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Plasma assisted combustion</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Plasma assisted ignition</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Non-equilibrium plasma</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Flame propagation</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Aircraft propulsion</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Guo, Peng</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ombrello, Timothy</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Won, Sang Hee</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Stevens, Christopher A.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Hoke, John L.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Schauer, Frederick</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ju, Yiguang</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="n">Elsevier Science</subfield><subfield code="a">Lloyd, C.E.M. ELSEVIER</subfield><subfield code="t">Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments</subfield><subfield code="d">2014</subfield><subfield code="d">the journal of the Combustion Institute</subfield><subfield code="g">Amsterdam [u.a.]</subfield><subfield code="w">(DE-627)ELV018057144</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:162</subfield><subfield code="g">year:2015</subfield><subfield code="g">number:6</subfield><subfield code="g">pages:2496-2507</subfield><subfield code="g">extent:12</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1016/j.combustflame.2015.02.019</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ELV</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHA</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OPC-GGO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_70</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">74.00</subfield><subfield code="j">Geographie</subfield><subfield code="j">Anthropogeographie: Allgemeines</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">44.73</subfield><subfield code="j">Geomedizin</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">162</subfield><subfield code="j">2015</subfield><subfield code="e">6</subfield><subfield code="h">2496-2507</subfield><subfield code="g">12</subfield></datafield><datafield tag="953" ind1=" " ind2=" "><subfield code="2">045F</subfield><subfield code="a">620</subfield></datafield></record></collection>
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