关键词: 航空、航天推进系统;爆震波;脉冲爆震发动机;自吸气+;数值仿真

Abstract: Four different types of structure to probe into the self-aspirating character of the air breathing pulse detonation engine according to the pressure variation in a cycle were studied numerically.The exploratory research shows that constant section straight detonation tube can self-aspirate from the open end at the low pressure in the tube after the purge process.However,the gas inhaled was almost totally exhaust gas which cannot be used for the next cycle.The separation of intake port and exhaust port can improve the quality of the inhaled gas.The far the intake port departs from the exhaust port the less influence the exhaust gas has and the better the self-aspiration quality will be.Pressure difference between the intake port and the exhaust port should exist.Otherwise,gas will be inhaled in from the two ports simultaneously forming gas oscillation in the tube and blocking up some exhaust-gas in the middle of the tube.With the help of designed aerodynamic valve the detonation tube can self-aspirate from the front end at the end of the purging process filling the tube with fresh air,which can be used for the next cycle.

Key words: Aerospace propulsion system;Detonation wave;Pulse detonation engine;Self-aspirate+;Numerical simulation