A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole
This paper reports the large eddy simulations of the effects of a saw-tooth plasma actuator and the laidback fan-shaped hole on the film cooling flow characteristics, and the numerical results are compared with a corresponding standard configuration（cylindrical hole without the sawtooth plasma actua...
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| Published in | Plasma science & technology Vol. 19; no. 8; pp. 125 - 137 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
IOP Publishing
01.08.2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1009-0630 1009-0630 |
| DOI | 10.1088/2058-6272/aa6744 |
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| Abstract | This paper reports the large eddy simulations of the effects of a saw-tooth plasma actuator and the laidback fan-shaped hole on the film cooling flow characteristics, and the numerical results are compared with a corresponding standard configuration（cylindrical hole without the sawtooth plasma actuator）. For this numerical research, the saw-tooth plasma actuator is installed just downstream of the cooling hole and a phenomenological plasma model is employed to provide the 3D plasma force vectors. The results show that thanks to the downward force and the momentum injection effect of the saw-tooth plasma actuator, the cold jet comes closer to the wall surface and extends further downstream. The saw-tooth plasma actuator also induces a new pair of vortex which weakens the strength of the counter-rotating vortex pair（CRVP） and entrains the coolant towards the wall, and thus the diffusion of the cold jet in the crossflow is suppressed.Furthermore, the laidback fan-shaped hole reduces the vertical jet velocity causing the disappearance of downstream spiral separation node vortices, this compensates for the deficiency of the saw-tooth plasma actuator. Both effects of the laidback fan-shaped hole and the saw-tooth plasma actuator effectively control the development of the CRVP whose size and strength are smaller than those of the anti-counter rotating vortex pair in the far field, thus the centerline and the spanwise-averaged film cooling efficiency are enhanced. The average film cooling efficiency is the biggest in the Fan-Dc=1 case, which is 80% bigger than that in the Fan-Dc=0 case and 288% bigger than that in the Cyl-Dc=0 case. |
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| AbstractList | This paper reports the large eddy simulations of the effects of a saw-tooth plasma actuator and the laidback fan-shaped hole on the film cooling flow characteristics, and the numerical results are compared with a corresponding standard configuration (cylindrical hole without the saw-tooth plasma actuator). For this numerical research, the saw-tooth plasma actuator is installed just downstream of the cooling hole and a phenomenological plasma model is employed to provide the 3D plasma force vectors. The results show that thanks to the downward force and the momentum injection effect of the saw-tooth plasma actuator, the cold jet comes closer to the wall surface and extends further downstream. The saw-tooth plasma actuator also induces a new pair of vortex which weakens the strength of the counter-rotating vortex pair (CRVP) and entrains the coolant towards the wall, and thus the diffusion of the cold jet in the crossflow is suppressed. Furthermore, the laidback fan-shaped hole reduces the vertical jet velocity causing the disappearance of downstream spiral separation node vortices, this compensates for the deficiency of the saw-tooth plasma actuator. Both effects of the laidback fan-shaped hole and the saw-tooth plasma actuator effectively control the development of the CRVP whose size and strength are smaller than those of the anti-counter rotating vortex pair in the far field, thus the centerline and the spanwise-averaged film cooling efficiency are enhanced. The average film cooling efficiency is the biggest in the Fan-Dc = 1 case, which is 80% bigger than that in the Fan-Dc = 0 case and 288% bigger than that in the Cyl-Dc = 0 case. This paper reports the large eddy simulations of the effects of a saw-tooth plasma actuator and the laidback fan-shaped hole on the film cooling flow characteristics, and the numerical results are compared with a corresponding standard configuration（cylindrical hole without the sawtooth plasma actuator）. For this numerical research, the saw-tooth plasma actuator is installed just downstream of the cooling hole and a phenomenological plasma model is employed to provide the 3D plasma force vectors. The results show that thanks to the downward force and the momentum injection effect of the saw-tooth plasma actuator, the cold jet comes closer to the wall surface and extends further downstream. The saw-tooth plasma actuator also induces a new pair of vortex which weakens the strength of the counter-rotating vortex pair（CRVP） and entrains the coolant towards the wall, and thus the diffusion of the cold jet in the crossflow is suppressed.Furthermore, the laidback fan-shaped hole reduces the vertical jet velocity causing the disappearance of downstream spiral separation node vortices, this compensates for the deficiency of the saw-tooth plasma actuator. Both effects of the laidback fan-shaped hole and the saw-tooth plasma actuator effectively control the development of the CRVP whose size and strength are smaller than those of the anti-counter rotating vortex pair in the far field, thus the centerline and the spanwise-averaged film cooling efficiency are enhanced. The average film cooling efficiency is the biggest in the Fan-Dc=1 case, which is 80% bigger than that in the Fan-Dc=0 case and 288% bigger than that in the Cyl-Dc=0 case. |
| Author | 李国占 俞建阳 刘华坪 陈浮 宋彦萍 |
| AuthorAffiliation | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001,People＇s Republic of China |
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| CitedBy_id | crossref_primary_10_1016_j_ijthermalsci_2020_106807 crossref_primary_10_1016_j_applthermaleng_2024_124404 crossref_primary_10_1016_j_ast_2021_106615 |
| Cites_doi | 10.1115/1.1860562 10.2514/6.2016-5051 10.2514/1.T3945 10.1115/1.2841118 10.1088/1009-0630/17/12/09 10.1017/S0022112094003800 10.1016/j.ijheatmasstransfer.2013.10.027 10.1146/annurev-fluid-121108-145550 10.1007/s00231-015-1672-6 10.1115/1.4032736 10.2514/6.2007-927 10.1175/1520-0493(1963)091<0099:GCEWTP>2.3.CO;2 10.1115/1.1459735 10.1016/0017-9310(74)90007-6 10.1007/s11433-011-4511-x 10.1115/1.2720508 10.1115/1.1625397 10.1088/0022-3727/46/12/125204 10.1063/1.4942606 10.1088/1009-0630/18/11/08 10.1063/1.1515103 10.1017/S0022112084000057 |
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| Copyright | 2017 Hefei Institutes of Physical Science, Chinese Academy of Sciences and IOP Publishing |
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| Notes | This paper reports the large eddy simulations of the effects of a saw-tooth plasma actuator and the laidback fan-shaped hole on the film cooling flow characteristics, and the numerical results are compared with a corresponding standard configuration（cylindrical hole without the sawtooth plasma actuator）. For this numerical research, the saw-tooth plasma actuator is installed just downstream of the cooling hole and a phenomenological plasma model is employed to provide the 3D plasma force vectors. The results show that thanks to the downward force and the momentum injection effect of the saw-tooth plasma actuator, the cold jet comes closer to the wall surface and extends further downstream. The saw-tooth plasma actuator also induces a new pair of vortex which weakens the strength of the counter-rotating vortex pair（CRVP） and entrains the coolant towards the wall, and thus the diffusion of the cold jet in the crossflow is suppressed.Furthermore, the laidback fan-shaped hole reduces the vertical jet velocity causing the disappearance of downstream spiral separation node vortices, this compensates for the deficiency of the saw-tooth plasma actuator. Both effects of the laidback fan-shaped hole and the saw-tooth plasma actuator effectively control the development of the CRVP whose size and strength are smaller than those of the anti-counter rotating vortex pair in the far field, thus the centerline and the spanwise-averaged film cooling efficiency are enhanced. The average film cooling efficiency is the biggest in the Fan-Dc=1 case, which is 80% bigger than that in the Fan-Dc=0 case and 288% bigger than that in the Cyl-Dc=0 case. actuator shaped downstream tooth averaged rotating vortex installed turbulent momentum Guozhan LI, Jianyang YU, Huaping LIU, Fu CHEN, Yanping SONG （School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People＇s Republic of China） 34-1187/TL PST-2016-0363.R3 Institute of Plasma Physics |
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| References | 11 22 12 23 24 Bauer H J (9) 2011 14 16 17 18 Joussot R (15) 2013; 46 1 2 3 4 Yu J Y (13) 2015; 17 5 6 7 8 Li G Z (19) 2016; 18 Liu Z F (21) 2014 20 10 |
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| SubjectTerms | counter rotating vortex pair film cooling large eddy simulation saw-tooth plasma actuator shaped hole 冷却效率 大涡模拟 强化 形状 气膜冷却 激励器 等离子体 锯齿形 |
| Title | A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole |
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