供油时间改变对脉冲爆震发动机工作特性的影响

为了提高脉冲爆震发动机(Pulse Detonation Engine,简称PDE)工作的协调性.试验获得汽油/空气混气点火延迟时间约为3.6 ms,缓燃向爆震转变(Deflagration-to-Detonation transition,简称DDT)过程所需时间约3.8 ms.对PDE一个工作周期进行合理的时间分配,采用电磁阀控制停止供油时间,动态压力传感器测量爆震波压力,研究PDE在一定的工作周期内的工作性能,发现对于小管径的,两相混气PDE可以不用隔离段;在亚音燃烧时段继续供油,PDE仍可以正常工作;在PDE膨胀时间段供油会使爆震波的压力峰值下降.研究的结果对提高PDE的工作频率及更好的组织两相爆震燃烧有一定的参考价值.

Investigation on the working characteristics of pulse detonation engine with changing the time of fuel injection

The investigation is aimed at the improvement of the coordination of operation for the two-phase pulse detonation engine.The time delay of ignition obtained in gasoline/air mixture by experiments was about 3.6ms.The time period of DDT process was about 3.8 ms.By sharing the total cycle time aptly and changing the time of fuel injection,the operation characteristics of PDE were researched by experiments.It was found that the period of the air purge can be eliminated in the operation of the two-phase PDE.Keeping the time of fuel injecting in the period of DDT process,the PDE prototype can operate steadily and cyclically.The time of fuel injection delays to the time period of the expansion process,the peak value of detonation pressure will be decreased.These conclusions are valuable for reference to increase operating frequency of PDE and promote the efficiency of two-phase detonation.