Guozhan LI (李国占), Jianyang YU (俞建阳), Huaping LIU (刘华坪), Fu CHEN (陈浮), Yanping SONG (宋彦萍). A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole[J]. Plasma Science and Technology, 2017, 19(8): 85505-085505. DOI: 10.1088/2058-6272/aa6744
Citation:
Guozhan LI (李国占), Jianyang YU (俞建阳), Huaping LIU (刘华坪), Fu CHEN (陈浮), Yanping SONG (宋彦萍). A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole[J]. Plasma Science and Technology, 2017, 19(8): 85505-085505. DOI: 10.1088/2058-6272/aa6744
Guozhan LI (李国占), Jianyang YU (俞建阳), Huaping LIU (刘华坪), Fu CHEN (陈浮), Yanping SONG (宋彦萍). A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole[J]. Plasma Science and Technology, 2017, 19(8): 85505-085505. DOI: 10.1088/2058-6272/aa6744
Citation:
Guozhan LI (李国占), Jianyang YU (俞建阳), Huaping LIU (刘华坪), Fu CHEN (陈浮), Yanping SONG (宋彦萍). A saw-tooth plasma actuator for film cooling efficiency enhancement of a shaped hole[J]. Plasma Science and Technology, 2017, 19(8): 85505-085505. DOI: 10.1088/2058-6272/aa6744
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Funds: This work is supported by National Natural Science Foundation of China (Grant No. 51306042) and the Fundamental Research Funds for the Central Universities (Grant No. HIT. NSRIF. 2013092).
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.
Wei YOU (尤玮), Hong LI (李弘), Wenzhe MAO (毛文哲), Wei BAI (白伟), Cui TU (涂翠), Bing LUO (罗兵), Zichao LI (李子超), Yolbarsop ADIL (阿迪里江), Jintong HU (胡金童), Bingjia XIAO (肖炳甲), Qingxi YANG (杨庆喜), Jinlin XIE (谢锦林), Tao LAN (兰涛), Adi LIU (刘阿娣), Weixing DING (丁卫星), Chijin XIAO (肖持进), Wandong LIU (刘万东). Design of the poloidal field system for KTX[J]. Plasma Science and Technology, 2018, 20(11): 115601. DOI: 10.1088/2058-6272/aac8d5
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