氧化剂环缝宽度对旋转爆震波传播特性影响的实验

To investigate the propagation characteristics of rotating detonation waves in different oxidizer inlet slots， experimental study was performed in a cavity-based annular combustor. The slot-orifice impinging injection scheme was utilized. Ethylene and oxygen-enriched air with an oxygen volume fraction of 50% were used as fuel and oxidizer, respectively. The propagation modes and characteristics of the rotating detonation wave were discussed. Experimental results indicated that the rotating detonation waves can propagate steadily， and three propagation modes， i.e.， stable detonation mode， periodic oscillation mode， and aperiodic oscillation mode， were observed in different oxidizer inlet slots. The equivalence ratio range of the periodic oscillation mode was expanded as the width of the oxidizer inlet slot increased， and each oscillation cycle included three processes， i.e.， decoupling of detonation waves，acceleration of deflagration waves， and regeneration of detonation waves. The average velocity of the combustion waves in the two oscillation modes was significantly lower than that in the stable detonation mode，and there existed significant velocity variations.