一种吸气式结构脉冲爆震发动机调节特性分析

Operating characteristics analysis for air-breathing pulse detonation engine

介绍了一种吸气式脉冲爆震发动机的工作方式和推力计算方法。分析了脉冲爆震发动机的两种调节特性:变频特性和节流特性。分析表明,一定飞行状态下,当发动机可爆震混合物未充填满时,存在最佳的爆震频率,高于和低于此爆震频率都会降低脉冲爆震发动机的推进性能,此时必须采用节流的方式提高发动机推进性能。当存在多余隔离气体时,在改变爆震频率的同时增大平均供油量可以提高发动机的推进性能。因此实际调节脉冲爆震爆震发动机应尽量采用组合的调节方式。

The operation cycle and thrust calculation method for air-breathing pulse detonation engines are introduced. Two operating characteristics of pulse detonation engine are analyzed： regulation operating frequency characteristics and flow control characteristics. It is shown that an optimal operating frequency exists in a given flight regime when the detonation chamber is filled with partially detonable gas, The performance of the engine will decrease with lower or higher frequency. Thus fuel flow control method must be used to increase the performance of the engine. When there are redundant purge gases, the performance of the engine will increase with increasing operating frequency and fuel flow. Therefore, combined control method should be used for controlling pulse detonation engines.