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为揭示等离子体气动激励对气膜冷却效果的影响机理,采用数值模拟方法研究了不同吹风比下的冷却气流流场分布、垂直主流截面的局部速度矢量分布和温度分布情况,并与常规气膜冷却结果作对比。结果表明,等离子体气动激励能有效诱导冷却气流偏转,提高气膜贴壁效果,延缓主流和冷却气流的掺混,壁面冷却效果显著增大;在不同吹风比下,沿流动方向等离子体启动激励气膜冷却效率的变化趋势相同;在激励器表面处壁面温度略有增大,但不影响冷却效率的提高。
In order to reveal the influence mechanism of plasma aerodynamic excitation on the film cooling effect, numerical simulation was used to study the flow field distribution, the local velocity vector distribution and the temperature distribution of the cooling airflow under different blowing ratios. Cooling results for comparison. The results show that the plasma aerodynamic excitation can effectively induce the deflection of the cooling air flow and improve the adhesion effect of the air film, and retard the blending of the main flow and the cooling air flow. The cooling effect of the wall surface is significantly increased. At different blowing ratios, the plasma excitation in the flow direction The changing trend of the film cooling efficiency is the same; the wall temperature slightly increases at the surface of the actuator, but does not affect the improvement of the cooling efficiency.