脉冲爆震发动机最大净推力和最佳工作频率

Maximal net thrust and optimal frequency of pulse detonation engine

为研究气动阀式脉冲爆震发动机净推力和工作频率之间的变化规律,建立了PDE净推力的近似计算模型。通过计算和试验的方法,研究了PDE能够达到的最大净推力及相应的最佳工作频率,以及爆震管长度L和PDE的阻力经验系数K1,K2等因素对PDE的最大净推力、最佳工作频率的影响。结果表明:L,K1,K2一定,PDE存在一个最佳工作频率fopt,在该频率下,PDE净推力最大。随着L增加,fopt下降;随着K1,K2增加,fopt和最大净推力都下降。研究结果对于PDE优化设计,提高PDE的工作性能具有重要的参考价值。

In order to investigate variational rule between net thrust and frequency of pulse detonation engine, a mathematic model for the net thrust of PDE is established. By means of the calculation and experiment, the maximum net thrust and the corresponding optimal frequency are analyzed, and the effects of detonation chamber length L, drag coefficients K1 and K2 on the maximum net thrust and the optimal operation frequency are analyzed. The results show that there is an optimal frequency of PDE and a corresponding maximum net thrust when L, K1 and K2 are constants. The optimal frequency decreases with the increasing value of L and the optimal frequency and the maximum net thrust all decline with the increasing value of K1 and K2. This investigation is helpful to optimize the design of PDE and to improve the performance of PDE.