Effects of inclined injection conditions on a rotating detonation engine performance studied via numerical simulations

The effect of inclined injection holes on the characteristics of detonation wave formation and propagation in the combustion chamber of rotating detonation engine (RDE) is conducted in a two-dimensional numerical model with a H2/air mixture. Detailed flowfield structures caused by four inclined angles of injection holes are different and each peak pressure is evaluated to reveal the intensity of detonation wave. The number, height and the propagation direction of detonation waves change significantly due to different inclined angles of injectors. Fewer waves exist as the inclined angle becomes larger. The pressure loss and velocity loss are calculated to evaluate the performance of the detonation waves. It can be found that the minimum pressure loss is in the case of 45 degree, and the minimum velocity loss achieved with the angle of 60 degree. Moreover, it can be indicated that the rotating direction coincide with the inclined orientation of injectors from the initial transient process.