| Abstract:In order to investigate the mechanism of shock wave-film interaction, a flat plate with a shock-wave generator was used to
simulate the flow field inside a transonic cascade. The incident shock wave was simulated by the shock-wave generator, and the effects of
the angle and length of the wedge-shaped shock-wave generator on the flow field of flat plate film cooling were studied by numerical
calculations under supersonic conditions of an approaching Mach number of 1.45 and blowing ratios of 0.25, 0.50 and 0.75. The results
show that the angle of the generator affects shock wave intensity and the shock wave-film cooling interaction causes the boundary layer flow
separation and the formation of separation bubbles. Moreover, the size of the separation bubble increases with the increase of the shock
wave intensity; Due to the bulge formed by the separation bubble, the turning angle of the airflow increases, leading to the generation of a
local normal shock wave when the shock wave generator angle is 5° or 7°; the length of the generator affects the distance between the
incident shock wave and the expansion waves, as the generator length increases, the effect of the expansion waves on the incident shock
wave decreases. Comparative analysis reveals that an appropriate shock generator can effectively mitigate the influence of disturbing waves
within the flow field, thereby highlighting the interaction effects of shock waves on film cooling. |
