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利用二维粒子图像测速(PIV)技术,在吹风比为0.5和1.0、雷诺数为480时,对平板直冷却孔和弯曲冷却孔下游湍流场的流动结构进行了测量,得到了中心截面及射流下游4个流向横截面上的平均速度、涡量分布以及烟雾显示照片,并分析了弯曲冷却孔通道对下游涡结构沿流向演化过程的影响.结果表明:冷却孔射流具有较低的射流轨迹,可以增强气膜的贴附效果,有利于提高冷却效率;弯曲冷却孔能为气膜提供较强的横向动量,使其具有较高的横向扩展能力,从而改善气膜的侧向覆盖效果.
The two-dimensional particle image velocimetry (PIV) was used to measure the flow structure of turbulent flow fields downstream of the straight cooling holes and the curved cooling holes at blow-up ratios of 0.5 and 1.0, and at a Reynolds number of 480. The center cross-section and jet The average velocities, vorticity distributions and smog photos on the four downstream cross sections were analyzed, and the influence of the curved cooling channel on the evolution of the downstream vortex structure was analyzed.The results show that the jets of the cooling holes have lower jet trajectories, Which can enhance the attachment effect of the gas film and improve the cooling efficiency. The curved cooling hole can provide a strong lateral momentum for the gas film so as to have a higher horizontal expansion capability so as to improve the lateral coverage effect of the gas film.