脉冲爆震发动机稳定工作性能的实验研究

为了对脉冲爆震发动机不同工作频率下稳定工作范围进行深入的研究,实验对汽油/空气可爆混气在不同工作频率、不同当量比下爆震发动机模型机的爆震压力和推力进行了测试,找出了不同频率下发动机稳定工作的最大和最小当量比。实验发现,当工作频率较低时发动机的稳定工作范围较宽,随着工作频率的增大,发动机的稳定工作范围逐渐变窄。在同一工作频率下,爆震发动机的平均推力随着当量比的增加是先增后降,但变化幅度很小,而混合比冲则是随着当量比的增加急剧下降。另外,在当量比一定的情况下,脉冲爆震发动机的平均推力随着工作频率的提高接近线性增加。

Experimental study for stable operation performance of pulse detonation engine

The detonation pressure and average thrust of pulse detonation engine(PDE) prototype are measured at different operation frequency and equivalence ratio using gasoline as fuel and air as oxidizers in order to investigate the stable operation range of PDE in detail.The maximum and minimum equivalence ratio under different operation frequency are obtained successfully.The results indicate that the stable operation range is very wide when the detonation frequency is low,but the stable operation range becomes smaller when the detonation frequency becomes high progressively.The average thrust of PDE increases at the beginning but decreases in the end with the equivalence ratio increasing under the same operation frequency.However,the change extent is very small.The impulse decreases rapidly when the equivalence ratio increases.The average thrust of PDE increases linearly with the operation frequency approximately for the same equivalence ratio.