带凹腔的旋转爆震发动机的工作特性研究

The effect of convergent nozzle on the operation characteristics of rotating detonation engine with cavity is investigated. The cross-correlation algorithm is applied to identify the propagation mode of detonation wave, and the stability parameters of detonation wave propagation are defined according to the loop delay of the auto-correlation. The total pressure at the combustor outlet is calculated by the average static pressure and Mach number, and then the total pressure recovery coefficient is obtained. With the decrease of nozzle outlet area, the lower boundary of detonable equivalent ratio will decrease. The stability of detonation wave propagation is less affected by the nozzle. The reduction of the nozzle outlet area is beneficial to increasing the velocity of detonation wave and the total pressure recovery coefficient of rotating detonation engine.