| 旋转对气膜冷却影响的大涡模拟 |
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| 引用本文： | 刘宁,孙纪宁. 旋转对气膜冷却影响的大涡模拟[J]. 推进技术, 2011, 32(2): 245-252 |
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| 作者姓名： | 刘宁 孙纪宁 |
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| 作者单位： | 北京航空航天大学航空发动机气动热力国防科技重点实验室,北京,100191 |
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| 摘 要： | 采用大涡模拟,考察了旋转影响气膜冷却的物理机制。参考实验模型,用带有30°倾斜圆柱孔的平板模拟涡轮转子叶片的吸力面,冷气出口雷诺数为1300,冷气和主流的吹风比为0.5,计算了静止和旋转数为0.2两种条件下的流动和换热,全面展示了旋转对平均流场、涡量、湍流结构和壁面温度分布的影响,并由此对实验现象进行了解释。结果表明,旋转使气膜孔下游的对转涡对产生不对称性;旋转引发的哥氏力使气膜冷却流场中的发夹型漩涡结构向高半径方向偏移,引起涡量分布的改变;旋转破坏了发夹涡的连续性,减少了对主流的卷吸和主流传递给冷气的热量,从而提高了冷却核心区的冷却效率,与实验中观察到的现象一致。
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| 关 键 词： | 气膜冷却 大涡模拟 旋转 哥氏力 湍流结构 |
| 收稿时间： | 2009-03-24 |
| 修稿时间： | 2009-06-23 |
Large eddy simulation of the effect of rotation on film cooling |
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| LIU Ning and SUN Ji-ning. Large eddy simulation of the effect of rotation on film cooling[J]. Journal of Propulsion Technology, 2011, 32(2): 245-252 |
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| Authors: | LIU Ning and SUN Ji-ning |
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| Affiliation: | LIU Ning,SUN Ji-ning(National Key Lab.of Aircraft Engine,Beijing Univ.of Aeronautics and Astronautics,Beijing 100191,China) |
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| Abstract: | Large eddy simulation was used to investigate the influence of rotation on film cooling.Film cooling over flat plate with 30o streamwise inclined cylinder hole which had experimental data for comparison was chosen to represent the suction side of turbine rotor blade.The Reynolds number at the jet exit was 1300,and the blowing ratio was 0.5.The flow field and heat transfer without rotation and with rotating number of 0.2 were calculated.The effect of rotation was comprehensively observed by showing the varia... |
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| Keywords: | Film cooling Large eddy simulation Rotation Coriolis force Turbulence structure |
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