Experimental Studies of Supersonic Film Cooling with Shock Wave Interaction (II)

In connection with a previous study which indicated that film cooling effectiveness in the region of the shock wave/film cooling interaction decreases due to the decrease of the Mach number of the coolant, the occurrence of enhanced mixing was investigated. In the vicinity of the wall surface, mixing between the coolant and the primary fluid was found to be unimportant, and the coolant layer produced effective film cooling in the interaction region. Moreover, viscous effects on momentum transfer were small in interaction region. Based on this, a flow structure model simulating the pressure distribution, along with a formula for a subsonic, turbulent boundary layer predicted the separation of the film coolant.