Numerical study on effect of film ejections in rotating detonation engine combustor

To solve the problem of high thermal load on the wall of the RDE （Rotating Detonation Engine），a numerical simulation of film cooling on the combustor wall of an RDE was carried out to explore the interaction between film outflow and detonation wave，oblique shock wave and flow field，as well as the film cooling characteristics on RDE wall.The results showed that the detonation wave had an obvious effect on the compression of the film and blockage of the cooling holes.The film had little effect on the overall propagation characteristics of the detonation wave.Affected by the detonation wave and the flow field of the combustor，the film outflow had periodic oscillations，which affected the cooling effect of the wall to a certain extent.Under the film cooling，the decrease of peak wall temperature was limited in the area covered by the detonation wave，but the decrease of time-average wall temperature was more than 26.9%.In the area covered by the oblique shock wave，with the increase of cooling air quantity，the decrease of peak wall temperature and time average wall temperature was more than 32.5% and 51.3%，respectively，and the cooling effect of the film on the wall covered by oblique shock wave became more significant.