H_2/Air旋转爆震发动机起爆实验研究

An Experimental Study on Initiation Process of H_2/Air Rotating Detonation Engine

为揭示旋转爆震发动机的点火特性,采用普通火花塞和高能火花塞作为发动机点火装置,对以氢气/空气为反应物的旋转爆震发动机进行了实验研究,结合高频压力测量与高速摄影结果分析了旋转爆震波的建立过程,并通过一系列点火实验得到了发动机的稳定工作范围。研究结果表明,两种点火方式均能成功起爆发动机,点火产生的燃烧波通过火焰加速与DDT过程形成旋转爆震波,增大点火能量能够大幅缩短旋转爆震波建立时间。发动机共有三种工作模式,稳定工作范围随燃料质量流量的增加而扩大,且不同工作模式会随反应物当量比的变化而相互转换。

An experimental study on a rotating detonation engine using hydrogen/air mixture was conducted to analyze the initiation process of detonation wave.Spark plug with different ignition energy were applied as the ignition device.The initiation process of rotating detonation wave was recorded and analyzed by a high frequency pressure measurement system and high-speed photographs.Series of experiments provided the operating range of the RDE.Results indicates that the engine could be successfully run by spark plug.Rotating detonation wave is formed through flame acceleration and DDT process,and the formation time of detonation wave reduces significantly with a higher ignition energy.The engine has three operation mode,and the stable operating range is extended with the increase of fuel mass rate.Different operation modes could be converted each other with the change of equivalence ratio.