直连式脉冲爆震发动机性能试验研究

为了掌握脉冲爆震发动机起爆和推进性能，基于汽油／空气脉冲爆震发动机模型机直连试验，开展不同工作频率下的起爆和推进性能试验研究。结果表明：模型机能在0～35Hz范围内快速起爆、稳定工作，爆燃向爆震转变距离约0．9m。随着工作频率的提高，平均推力成线形增大，但平均推力增加的斜率随着频率的升高有所降低。随着频率提高，体积比冲和混合物比冲均逐渐增加，趋势类似；频率25Hz时的体积比冲和混合物比冲最高。燃油比冲随着频率提高显著增加，单位燃油消耗率则逐渐降低；频率超过25Hz时，燃油比冲和单位燃油消耗率变化不大。

Experimental Investigation on the Detonation and Propulsion Performance of a Direct-Connected Pulse Detonation Engine

In order to predominate the performance of detonation initiation and propulsion, based on the direct connected test of a gasoline/air pulse detonation engine（PDE） mock-up, the corresponding detonation initiation and propulsion experiments at different operation frequencies are carried out. The results indicate that detona tions are fully developed quickly in the PDE mock-up at the operation frequency range of 0-35 Hz, in which the deflagration to detonation transition（DDT） distance is about 0.9 m（from the ignition）. As the operation fre quency increases, the PDE average thrust increases linearly while the increasing slope decreases slightly. The volume specific impulse and mixture specific impulse are of the similar change trend with the operation frequen cy. The maximum values of volume specific impulse and mixture specific impulse are both obtained at the opera tion frequency of 25 Hz. Meanwhile, the fuel specific impulse increases dramatically and the specific fuel con sumption decreases gradually. When the operation frequency exceeds 25 Hz, the fuel specific impulse and spe cific fuel consumption changs slightly.