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在喷孔-喷孔和环缝-喷孔对撞式喷注模型发动机上,采用H2/O2热射流切向喷注的起爆方式进行了H2/air组合的连续旋转爆震试验,根据高频压力测量和高速摄影观测结果对爆震波传播过程进行了分析。试验发现了短暂的和可长时间维持的双波对撞传播现象,在该传播模式下燃烧室内存在两个爆震波头,但传播方向相反,周期性发生对撞,其高频压力振荡特征跟测压点距对撞点的夹角相关。初步分析了双波对撞传播过程的形成机制,认为在爆震波顶部能否形成混合气体层是实现该传播模式的关键。
In the injection hole - nozzle hole and ring seam - nozzle colliding injection engine, H2 / air combined continuous rotary detonation test was carried out by using H2 / O2 thermal jet tangential injection initiation method. According to the high frequency Pressure measurement and high-speed photography observations of the detonation wave propagation process were analyzed. It was found that the phenomenon of transient and long-term double-wave collisions was found. In this propagation mode, there were two detonation waveguides in the combustion chamber, but the propagation direction was opposite and periodic collision occurred. The characteristics of high-frequency pressure oscillation Pressure measuring point from the collision point angle related. The formation mechanism of the double-wave collision propagation is analyzed preliminarily. It is considered that the formation of a mixed gas layer at the top of the detonation wave is the key to the propagation mode.