| 不同射流角下等离子体激励对平板气膜冷却影响的数值研究 |
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| 引用本文： | 李国占,刘华坪,陈浮,李林熹,宋彦萍.不同射流角下等离子体激励对平板气膜冷却影响的数值研究[J].航空动力学报,2017,32(9):2088-2094. |
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| 作者姓名： | 李国占 刘华坪 陈浮 李林熹 宋彦萍 |
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| 作者单位： | 哈尔滨工业大学 能源科学与工程学院，哈尔滨 150001 |
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| 基金项目： | 国家自然科学基金（51306042） |
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| 摘 要： | 采用大涡模拟（LES）方法对有/无等离子体激励条件下不同射流角时的平板气膜冷却流场进行了对比研究。结果表明:随着射流角的增大，冷却射流对主流的穿透率与气膜孔下游回流区的范围增大，发卡涡的强度及其抬升射流的能力增强并远离壁面，导致气膜冷却效率降低，但射流角为90°时部分低能冷却流体会进入回流区引起气膜冷却效率升高，故气膜冷却效率在射流角为35°时最大，在射流角为60°时最小；等离子体激励削弱了冷却射流对主流的穿透率，其下拉诱导作用也使得发卡涡头部受到的库塔 儒科夫斯基升力以及水平涡腿间的相互诱导力减小，抑制了发卡涡的发展并促使其破碎为近壁条带结构，从而提高了气膜冷却效率，且射流角越小，上述作用效果越明显，当射流角为35°时中心线气膜冷却效率提高了55%。
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| 关 键 词： | 大涡模拟(LES) 等离子体激励 气膜冷却 射流角 肾形涡 发卡涡 冷却效率 |
| 收稿时间： | 2016/1/22 0:00:00 |
Numerical analysis of flat plate film cooling characteristics at various streamwise angles based on plasma actuation |
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| LI Guozhan,LIU Huaping,CHEN Fu,LI Linxi,SONG Yanping.Numerical analysis of flat plate film cooling characteristics at various streamwise angles based on plasma actuation[J].Journal of Aerospace Power,2017,32(9):2088-2094. |
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| Authors: | LI Guozhan LIU Huaping CHEN Fu LI Linxi SONG Yanping |
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| Abstract: | Large eddy simulations(LES) were carried out to numerically investigate the effects of streamwise angles on the film cooling performance with and without plasma actuation. Results showed that as the streamwise angle increased, the coolant penetrated deeper into the crossflow, thus the reverse flow region downstream the jet grew in size, and the strength and the lift off effect of the hairpin vortex increased, resulting in a reduction of film cooling efficiency, but at 90° angle the film cooling efficiency slightly increased since some cold fluid was entrained into its wake. As a result, the film cooling efficiency was the highest at 35°angle and the lowest at 60°angle. Due to the downward momentum of plasma actuation, the penetration of the jet into the crossflow was depressed, the Kutta Zhoukowski lift acted by the crossflow and on the head of the hairpin vortex was reduced, and the strength of the mutual induction between the feet of the hairpin vortex was decreased. Accordingly, the evolution and the lift off effect of the hairpin vortex were suppressed, thus the film cooling efficiency was enhanced and these impacts were more significant at smaller streamwise angle. At the 35° angle the centerline film cooling efficiency increased by 55% at most. |
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| Keywords: | large eddy simulation(LES) plasma actuation film cooling streamwise angle counter ratating vortex pair hairpin vortex cooling efficiency |
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