Experimental investigation of combustion modes and transition mechanism in confined combustion chamber
In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhao, Jianfu [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2021transfer abstract |
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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:230 ; year:2021 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.combustflame.2021.111451 |
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| 520 | |a In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. | ||
| 520 | |a In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. | ||
| 700 | 1 | |a Zhou, Lei |4 oth | |
| 700 | 1 | |a Zhang, Xiaojun |4 oth | |
| 700 | 1 | |a Li, Kuangdi |4 oth | |
| 700 | 1 | |a Wei, Haiqiao |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 |
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10.1016/j.combustflame.2021.111451 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001629.pica (DE-627)ELV05440522X (ELSEVIER)S0010-2180(21)00191-7 DE-627 ger DE-627 rakwb eng 690 VZ 610 VZ 74.00 bkl 44.73 bkl Zhao, Jianfu verfasserin aut Experimental investigation of combustion modes and transition mechanism in confined combustion chamber 2021transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. Zhou, Lei oth Zhang, Xiaojun oth Li, Kuangdi oth Wei, Haiqiao 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:230 year:2021 pages:0 https://doi.org/10.1016/j.combustflame.2021.111451 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 230 2021 0 |
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10.1016/j.combustflame.2021.111451 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001629.pica (DE-627)ELV05440522X (ELSEVIER)S0010-2180(21)00191-7 DE-627 ger DE-627 rakwb eng 690 VZ 610 VZ 74.00 bkl 44.73 bkl Zhao, Jianfu verfasserin aut Experimental investigation of combustion modes and transition mechanism in confined combustion chamber 2021transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. Zhou, Lei oth Zhang, Xiaojun oth Li, Kuangdi oth Wei, Haiqiao 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:230 year:2021 pages:0 https://doi.org/10.1016/j.combustflame.2021.111451 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 230 2021 0 |
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10.1016/j.combustflame.2021.111451 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001629.pica (DE-627)ELV05440522X (ELSEVIER)S0010-2180(21)00191-7 DE-627 ger DE-627 rakwb eng 690 VZ 610 VZ 74.00 bkl 44.73 bkl Zhao, Jianfu verfasserin aut Experimental investigation of combustion modes and transition mechanism in confined combustion chamber 2021transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. Zhou, Lei oth Zhang, Xiaojun oth Li, Kuangdi oth Wei, Haiqiao 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:230 year:2021 pages:0 https://doi.org/10.1016/j.combustflame.2021.111451 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 230 2021 0 |
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10.1016/j.combustflame.2021.111451 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001629.pica (DE-627)ELV05440522X (ELSEVIER)S0010-2180(21)00191-7 DE-627 ger DE-627 rakwb eng 690 VZ 610 VZ 74.00 bkl 44.73 bkl Zhao, Jianfu verfasserin aut Experimental investigation of combustion modes and transition mechanism in confined combustion chamber 2021transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. Zhou, Lei oth Zhang, Xiaojun oth Li, Kuangdi oth Wei, Haiqiao 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:230 year:2021 pages:0 https://doi.org/10.1016/j.combustflame.2021.111451 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 230 2021 0 |
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10.1016/j.combustflame.2021.111451 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001629.pica (DE-627)ELV05440522X (ELSEVIER)S0010-2180(21)00191-7 DE-627 ger DE-627 rakwb eng 690 VZ 610 VZ 74.00 bkl 44.73 bkl Zhao, Jianfu verfasserin aut Experimental investigation of combustion modes and transition mechanism in confined combustion chamber 2021transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. Zhou, Lei oth Zhang, Xiaojun oth Li, Kuangdi oth Wei, Haiqiao 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:230 year:2021 pages:0 https://doi.org/10.1016/j.combustflame.2021.111451 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 230 2021 0 |
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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:230 year:2021 pages:0 |
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Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments |
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A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. 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Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments |
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experimental investigation of combustion modes and transition mechanism in confined combustion chamber |
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Experimental investigation of combustion modes and transition mechanism in confined combustion chamber |
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In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. |
| abstractGer |
In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. |
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In the present work, different combustion modes and the transition mechanism were experimentally investigated in a confined combustion chamber. A H2–O2–N2 mixture with variable oxygen concentration was used as test fuel. Different numbers of perforated plates with varying porosities were employed to change the flame propagation velocity. Depending on the initial thermodynamic conditions, four types of combustion modes were observed: normal combustion (mode 1), end-gas autoignition without detonation (mode 2), end-wall detonation (mode 3), and side-wall detonation (mode 4). It was found that with the transition of the combustion mode from mode 1 to mode 4, the overall level of pressure and pressure oscillation increased due to autoignition and detonation. Moreover, the effects of ignition delay time and flame propagation velocity on the combustion mode transition were studied. With increasing oxygen concentration, the ignition delay time was shortened, and the flame propagation was accelerated, which consequently caused the combustion mode to evolve from mode 1 to mode 4. In addition, different perforated plate configurations were employed to separately investigate the effects of the flame propagation velocity on the combustion mode transition. In summary, the combustion mode was jointly affected by the ignition delay time and flame propagation velocity. Both a shorter ignition delay time and a higher flame propagation velocity were favorable for the occurrence of autoignition and detonation. |
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Experimental investigation of combustion modes and transition mechanism in confined combustion chamber |
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