论文部分内容阅读
为研究旋转爆震发动机(Rotating Detonation Engine,RDE)工作过程中火焰与压力波的传播特性,在采用非预混喷注方式的H2/Air发动机模型上进行实验,采用的测量装置包括离子探针、高频压力传感器和高速摄影。结合离子信号曲线、压力曲线和高速摄影图片,分析了从点火到形成稳定旋转爆震波的过程,从测量结果中观察到了燃烧波的对撞现象及火焰与压力波的发展过程;在RDE的稳定工作过程中,火焰与压力波耦合,通过分析离子信号曲线,发现离燃烧室入口较近的点受新鲜反应物喷注的影响较大,并解释了实验所得爆震波的速度亏损和压力峰值相比于理论C-J(Chapman-Jouguet)值偏低的现象;在RDE熄火过程中也观察到了压力波和火焰的耦合,但离子信号峰值、压力峰值及压力波瞬时传播速度持续下降,一段时间后,发动机熄火。这些研究结论对理解RDE中旋转爆震波的起始和传播机理具有一定的参考价值。
In order to study the propagation characteristics of flame and pressure wave during the operation of Rotating Detonation Engine (RDE), an experiment was carried out on a H2 / Air engine model using a non-premixed injection method. The measuring device used included an ion probe , High-frequency pressure sensor and high-speed photography. Combining with the ion signal curve, pressure curve and high-speed photogrammetry, the process from ignition to formation of a stable rotating detonation wave was analyzed. The phenomena of the collision of the combustion wave and the development of flame and pressure wave were observed from the measurement results. During the working process, the flame and the pressure wave were coupled. By analyzing the curve of the ion signal, it was found that the point nearer to the inlet of the combustion chamber was greatly affected by the injection of fresh reactant. The experimental results showed that the velocity loss and pressure peak phase of the detonation wave Compared with the low value of CJ (Chapman-Jouguet) theory, the coupling of pressure wave and flame was also observed during the turn-off of RDE. However, the peak value of ion signal, the peak of pressure and the instantaneous propagation velocity of pressure wave continued to decrease. After a period of time, Engine stalls. These findings have some reference value for understanding the initiation and propagation mechanism of rotary detonation wave in RDE.