关键词: 激波；气膜；分离；逆压梯度；边界层吸除；冷却效率

Abstract: In order to study the mechanism of interaction between shock wave and cooling film and how to eliminate these influences，wall with special slots based on the flat plane model is designed. Through numerical simulation the mechanism of how the wall with slots controlling the influences of shock wave is investigated in three different conditions. The Mach number of mainstream is 3.2 and those of coolants are 1.0，0.6 and 0.4 respectively. The results of numerical simulation indicate that the wall with slots has better flow structure under the conditions of shock wave，and can reduce the size of film separation zone to a third compared with flat plane wall，and the reversed vortex pairs which are generated when film injects into mainstream are weaken to a certain extend. These changes can effectively restrict the entrainment and mixture of film. The data suggest that the film-cooling effectiveness can be improved by 6% at most when the wall is slotted and this effect is greatly related to the mass flow rate of flow through the pressure-relief slot. In addition，the results show that the model which releases the high pressure upstream has better performance than which releases the high pressure downstream under the same condition. The total pressure recovery coefficient can be maintained at a high range through reasonable arrangement of the positions and widths of slots.

Key words: Shock wave；Cooling film；Separation；Adverse pressure gradient；Boundary layer suction；Cooling effectiveness