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为了考察弯曲冷却孔通道对气膜冷却的影响,运用稳态液晶测温技术,对处于横向流中平板孤立圆形直孔和圆形弯曲孔下游的换热特性进行了实验研究。得到了吹风比为0.51、0.8、1.04、1.22下,冷却孔下游附近的冷却效率分布和传热系数的二维分布。实验结果证明:弯曲射流能够有效地提高下游的冷却效率,并且能使气膜具有较强的横向扩展能力,覆盖效果好。但由于其对主流有较强的扰动,所以会增加当地的局部传热系数。
In order to investigate the influence of the curved cooling channel on the film cooling, steady-state liquid crystal temperature measurement technique was used to study the heat transfer characteristics of the circular straight hole and circular curved hole downstream of the plate in the transverse flow. The distribution of the cooling efficiency and the two-dimensional distribution of the heat transfer coefficient near the cooling holes were obtained under the blowing ratio of 0.51,0.8,1.04,1.22. Experimental results show that the bending jet can effectively improve the downstream cooling efficiency, and can make the film have a strong horizontal expansion capability, covering effect is good. However, due to its strong disturbance to the mainstream, it will increase the local heat transfer coefficient.