Numerical Investigation of Flow Field in Continuous Rotating Detonation Engine Isolator

Abstract

To investigate the characteristics of the backpressure in a continuous rotating detonation engine(CRDE)isolator,the models of straight isolator and isolator with an expansion section were established. The three-dimensional numerical simulation on the isolator of the two configurations was carried out by FLURNT. The characteristics of the rotating detonation wave propagating upstream in the isolator were analyzed. The influences of different structures on the flow field structure and the forward position of the shock train were analyzed. For the same structure,the influences of the backpressure and the rotational speed on it were analyzed. The results show that the backpressure interacting with the boundary layer in the isolator can induce complex shock and expansion structures,forming a shock train. The distance forwarded by the backpressure in the isolator is related to the configuration of the isolator,and the speed and magnitude of the backpressure rotation. The relatively enhancement of the pressure resistance of the straight isolator,the increasing of the backpressure speed or pressure can increase the disturbance area. The numerical simulation results have certain reference value for the backpressure characteristics and structural design of the isolated rotating detonation engine.