论文部分内容阅读
为研究并改善旋转爆震发动机的点火-起爆性能,进一步深入了解点火方式对旋转爆震发动机工作特性的影响,采用小能量火花点火装置、高能量火花点火装置、爆震管三种点火方式,进行了一系列旋转爆震发动机起爆实验,发动机采用环缝-喷孔对撞式掺混方式,燃料为H2,氧化剂为空气。实验对比研究了不同点火方式下旋转爆震发动机的点火起爆性能及点火方式对发动机工作特性影响。实验结果表明三种点火方式均成功起爆旋转爆震波,并周向稳定传播。通过对旋转爆震波起爆过程详细分析发现,不同点火方式引燃的不同初始状态的火焰均需在环形燃烧室经历一个类似DDT的火焰发展过程才能成功建立爆震波,且火焰发展过程的时间间隔表现出很强的随机性,但总体来看爆震管点火时爆震波建立时间较其他两种点火方式短。此外,该工况条件下三种点火方式起爆发动机时其工作状况可重复性均可达100%,稳定工作过程中的传播特性与点火方式无明显关系,爆震波传播频率较为稳定,在5437~6440Hz波动。
In order to study and improve the ignition / detonation performance of the rotary detonation engine, the influence of the ignition mode on the performance of the rotary detonation engine is further studied. Three kinds of ignition modes, ie, low energy spark ignition device, high energy spark ignition device and detonation tube, A series of rotary detonation engine detonation experiments were carried out. The engine adopted a ring-to-orifice colliding blending mode, the fuel was H2 and the oxidant was air. The ignition and detonation performance of the rotary detonation engine under different ignition modes and the influence of ignition mode on the engine operating characteristics were experimentally studied. Experimental results show that all three kinds of ignition methods successfully initiate the rotary detonation wave and propagate in the circumferential direction. Through the detailed analysis of the detonation process of the rotary detonation wave, it is found that the flame of different initial states ignited by different ignition methods needs to undergo a flame development process similar to DDT in the annular combustion chamber to establish the detonation wave successfully, and the time interval of the flame development process A very strong randomness, but overall the detonation wave ignition time when the detonation wave establishment time is shorter than the other two ignition methods. In addition, the working conditions repeatability up to 100% when the three ignition methods detonated under this working condition can reach 100%. The propagation characteristics during steady working have no obvious relation with ignition mode, and the propagation frequency of detonation wave is relatively stable. In 5437 ~ 6440Hz fluctuations.