当量比对液体燃料旋转爆轰发动机爆轰影响实验研究

Experimental Study on Effects of Equivalence Ratio on Detonation Characteristics of Liquid-Fueled Rotating Detonation Engine

为了研究液态燃料连续旋转爆轰波起爆机理和不同工况下的旋转爆轰波特性,采用了环形阵列式精细雾化装置,进行了汽油/富氧空气组合的连续旋转爆轰试验。试验成功起爆并实现了旋转爆轰波的自持传播,爆轰波传播频率为2.1-2.4k Hz,传播速度为1022.2-1171.8m/s。该发动机上旋转爆轰波始终为同向传播模态,存在单波头、双头波和多波头同时存在的混合传播模态,旋转爆轰波传播速度存在亏损。试验工况范围内,旋转爆轰波的传播速度随总推进剂的质量流量增大而增加;在一定工况范围内,同一当量比工况下,旋转爆轰波压力值随总推进剂的质量流量增大而增加;旋转爆轰波压力极大值出现在当量比1.1附近。

To study the initiation mechanism and characteristics of liquid-fueled rotating detonation wave, the gasoline/oxygen-enriched air continuous rotating detonation engine with fine atomization devices in a ringshaped arrangement has been studied experimentally under different experimental conditions. The formation and self sustaining transmission of rotating detonation wave have been realized. Its propagation frequency and rotating velocity range from 2.1 kHz to 2.4 kHz and from 1022.2 m/s to 1171.8 m/s, respectively. The rotating detonation wave propagates in one direction all the time. There are three kinds of propagation modes existing at the same time： single-wave, double-waves and multiple-waves. The propagation velocity of rotating detonation wave increases with the increase of total mass flow rate of propellant under all test conditions. However, the pressure peak of rotating detonation wave only increases with the increase of total mass flow rate of propellant under specific work conditions when the equivalence ratio is the same. The maximum of this pressure peak appears when the equivalence ratio is about 1.1.