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大涡模拟考察了旋转状态来流条件对单孔平板气膜冷却的影响,气膜孔沿流向倾斜30°,气膜出流的雷诺数为2 600,吹风比为0.5,计算了静止和旋转数为0.02时气膜冷却的流动和换热,对比两种主流进口条件下旋转对气膜冷却的影响。计算结果表明:(1)均匀来流条件下,旋转主要使发夹涡结构产生非对称分布,裹挟气膜向高半径方向偏转;(2)充分发展的来流条件下,旋转使来流边界层内产生湍流结构,淹没了射流进入主流时产生的发夹涡,引起更强烈的射流扩散,增大了气膜覆盖范围,降低了气膜冷却效率的峰值;(3)旋转通过改变来流边界层内的湍流结构对气膜冷却的影响更显著。
Large eddy simulation studies the effect of rotational flow conditions on the cooling of single-hole flat film. The film hole is inclined by 30 ° in the flow direction, the Reynolds number of the film flow is 2 600 and the blowing ratio is 0.5. The static and rotation When the number is 0.02, the flow and heat transfer of the film cooling are compared, and the influence of the rotation on the film cooling under the two mainstream inlet conditions is compared. The results show that: (1) Under the condition of uniform flow, the rotation mainly causes the vortex structure of the hairpin to be asymmetrically distributed and the gas film to be wrapped deflects to the high radius; (2) Under the fully developed flow conditions, Turbulent structure is generated in the layer, which causes submergence of the vortex vortex generated when the jet enters the mainstream, causing more intense jet diffusion, increasing the coverage of the air film and reducing the peak value of the film cooling efficiency. (3) The influence of turbulent structure in the boundary layer on the film cooling is more significant.