VIV suppression for a large mass-damping cylinder attached with helical strakes
The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-dampin...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Sui, Juan [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016transfer abstract |
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| Schlagwörter: |
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| Umfang: |
22 |
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| Übergeordnetes Werk: |
Enthalten in: Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases - Brito-Zerón, P. ELSEVIER, 2013, Orlando, Fla |
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| Übergeordnetes Werk: |
volume:62 ; year:2016 ; pages:125-146 ; extent:22 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.jfluidstructs.2016.01.005 |
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ELV035383801 |
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| 245 | 1 | 0 | |a VIV suppression for a large mass-damping cylinder attached with helical strakes |
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| 520 | |a The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. | ||
| 520 | |a The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. | ||
| 650 | 7 | |a Wind tunnel experiment |2 Elsevier | |
| 650 | 7 | |a Helical strake |2 Elsevier | |
| 650 | 7 | |a VIV suppression |2 Elsevier | |
| 650 | 7 | |a Vortex-induced vibration (VIV) |2 Elsevier | |
| 700 | 1 | |a Wang, Jiasong |4 oth | |
| 700 | 1 | |a Liang, Shengping |4 oth | |
| 700 | 1 | |a Tian, Qilong |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Brito-Zerón, P. ELSEVIER |t Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases |d 2013 |g Orlando, Fla |w (DE-627)ELV017003725 |
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10.1016/j.jfluidstructs.2016.01.005 doi GBVA2016015000003.pica (DE-627)ELV035383801 (ELSEVIER)S0889-9746(16)00012-8 DE-627 ger DE-627 rakwb eng 530 530 DE-600 610 VZ 550 VZ 38.48 bkl Sui, Juan verfasserin aut VIV suppression for a large mass-damping cylinder attached with helical strakes 2016transfer abstract 22 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. Wind tunnel experiment Elsevier Helical strake Elsevier VIV suppression Elsevier Vortex-induced vibration (VIV) Elsevier Wang, Jiasong oth Liang, Shengping oth Tian, Qilong oth Enthalten in Elsevier Brito-Zerón, P. ELSEVIER Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases 2013 Orlando, Fla (DE-627)ELV017003725 volume:62 year:2016 pages:125-146 extent:22 https://doi.org/10.1016/j.jfluidstructs.2016.01.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OPC-GGO SSG-OPC-GEO 38.48 Marine Geologie VZ AR 62 2016 125-146 22 045F 530 |
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10.1016/j.jfluidstructs.2016.01.005 doi GBVA2016015000003.pica (DE-627)ELV035383801 (ELSEVIER)S0889-9746(16)00012-8 DE-627 ger DE-627 rakwb eng 530 530 DE-600 610 VZ 550 VZ 38.48 bkl Sui, Juan verfasserin aut VIV suppression for a large mass-damping cylinder attached with helical strakes 2016transfer abstract 22 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. Wind tunnel experiment Elsevier Helical strake Elsevier VIV suppression Elsevier Vortex-induced vibration (VIV) Elsevier Wang, Jiasong oth Liang, Shengping oth Tian, Qilong oth Enthalten in Elsevier Brito-Zerón, P. ELSEVIER Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases 2013 Orlando, Fla (DE-627)ELV017003725 volume:62 year:2016 pages:125-146 extent:22 https://doi.org/10.1016/j.jfluidstructs.2016.01.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OPC-GGO SSG-OPC-GEO 38.48 Marine Geologie VZ AR 62 2016 125-146 22 045F 530 |
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10.1016/j.jfluidstructs.2016.01.005 doi GBVA2016015000003.pica (DE-627)ELV035383801 (ELSEVIER)S0889-9746(16)00012-8 DE-627 ger DE-627 rakwb eng 530 530 DE-600 610 VZ 550 VZ 38.48 bkl Sui, Juan verfasserin aut VIV suppression for a large mass-damping cylinder attached with helical strakes 2016transfer abstract 22 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. Wind tunnel experiment Elsevier Helical strake Elsevier VIV suppression Elsevier Vortex-induced vibration (VIV) Elsevier Wang, Jiasong oth Liang, Shengping oth Tian, Qilong oth Enthalten in Elsevier Brito-Zerón, P. ELSEVIER Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases 2013 Orlando, Fla (DE-627)ELV017003725 volume:62 year:2016 pages:125-146 extent:22 https://doi.org/10.1016/j.jfluidstructs.2016.01.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OPC-GGO SSG-OPC-GEO 38.48 Marine Geologie VZ AR 62 2016 125-146 22 045F 530 |
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10.1016/j.jfluidstructs.2016.01.005 doi GBVA2016015000003.pica (DE-627)ELV035383801 (ELSEVIER)S0889-9746(16)00012-8 DE-627 ger DE-627 rakwb eng 530 530 DE-600 610 VZ 550 VZ 38.48 bkl Sui, Juan verfasserin aut VIV suppression for a large mass-damping cylinder attached with helical strakes 2016transfer abstract 22 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. Wind tunnel experiment Elsevier Helical strake Elsevier VIV suppression Elsevier Vortex-induced vibration (VIV) Elsevier Wang, Jiasong oth Liang, Shengping oth Tian, Qilong oth Enthalten in Elsevier Brito-Zerón, P. ELSEVIER Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases 2013 Orlando, Fla (DE-627)ELV017003725 volume:62 year:2016 pages:125-146 extent:22 https://doi.org/10.1016/j.jfluidstructs.2016.01.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OPC-GGO SSG-OPC-GEO 38.48 Marine Geologie VZ AR 62 2016 125-146 22 045F 530 |
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10.1016/j.jfluidstructs.2016.01.005 doi GBVA2016015000003.pica (DE-627)ELV035383801 (ELSEVIER)S0889-9746(16)00012-8 DE-627 ger DE-627 rakwb eng 530 530 DE-600 610 VZ 550 VZ 38.48 bkl Sui, Juan verfasserin aut VIV suppression for a large mass-damping cylinder attached with helical strakes 2016transfer abstract 22 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. Wind tunnel experiment Elsevier Helical strake Elsevier VIV suppression Elsevier Vortex-induced vibration (VIV) Elsevier Wang, Jiasong oth Liang, Shengping oth Tian, Qilong oth Enthalten in Elsevier Brito-Zerón, P. ELSEVIER Safety and usefulness of minimally-invasive biopsy of minor salivary glands in internal medicine: Searching for systemic infiltrative diseases 2013 Orlando, Fla (DE-627)ELV017003725 volume:62 year:2016 pages:125-146 extent:22 https://doi.org/10.1016/j.jfluidstructs.2016.01.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OPC-GGO SSG-OPC-GEO 38.48 Marine Geologie VZ AR 62 2016 125-146 22 045F 530 |
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viv suppression for a large mass-damping cylinder attached with helical strakes |
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VIV suppression for a large mass-damping cylinder attached with helical strakes |
| abstract |
The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. |
| abstractGer |
The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. |
| abstract_unstemmed |
The experiments on vortex-induced vibration (VIV) suppression for a circular cylinder with helical strake by varying its heights, pitches, coverages and cross sections were carried out in a wind tunnel at Reynolds number (Re) ranging from 2.7×103 to 5.79×104. The bare cylinder with large mass-damping parameter (m*ζ=1.415, where m* is the mass ratio and ζ is the structural damping factor) was flexibly mounted. The response characteristics were analyzed by comparing with the classical experimental results under different mass-damping parameters. Two-degree-of-freedom (2DOF, cross-flow (CF) and in-line (IL)) displacements of the cylinder with and without helical strakes were measured by two laser sensors. All amplitude responses of cylinders attached with helical strake of m*ζ varying from 1.966 to 3.354 are less than those of the bare cylinder. The strake height and coverage have a great influence on the VIV suppression rather than the strake pitch. The helical strake of P/D=5, h/D=0.14 ("D"-type) is the most effective one, with which the VIV suppression efficiency on the root-mean-square (RMS) value of CF amplitude reaches up to over 85% and the maximum suppression efficiency reaches up to 98% at U r =20 in the peak region. Flow visualizations of bare cylinder and straked cylinder of P/D=10, h/D=0.10 on the plane perpendicular to the cylinder axis were conducted in different conditions, and it can be found that helical strake can change vibration frequencies, and suppress the vortex shedding of circular cylinder by varying the separation points, avoiding the interaction between the two shear layers, reducing the vortex structures scale, resulting in vibration suppression of bare cylinder. |
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