冷却流分段注入对超声速气膜冷却的影响

In view of the phenomenon that the incident shock wave often destroys the cooling effect in supersonic film cooling, five structures of segmented cooling-stream injection with different inlet height combinations are investigated under the constant coolant mass flow rate. The effect of segmented cooling-stream injection on supersonic film cooling with shock wave impingement is analyzed by comparing with the case of single cooling-stream injection. The results show that only part of cooling stream undergoes the local enhanced mixing effect driven by the shock wave for segmented cooling-stream injection, so segmented injection can improve the cooling effect compared with single injection. Through the comparison of cooling parameters such as average film cooling effectiveness, minimum film cooling effectiveness, film coverage rate, structure 2 has the best cooling effect among the five structures of segmented cooling-stream injection studied in the present study.