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为了研究喷管对旋转爆震发动机(RDE)性能的影响,设计了RDE推力测试台,RDE环形燃烧室的内径和外径分别为70mm和80mm,长度为40mm,以氢气和空气分别作为燃料和氧化剂,采用环缝-喷孔对撞式掺混方式,使用高能火花塞点火,并用压电式压力传感器测量推力,实验研究在燃烧室出口安装收敛喷管、扩张喷管以及拉瓦尔喷管对发动机工作性能的影响.结果表明,入口总质量流量小于0.126kg/s时,在发动机稳定工作的工况范围内,收敛喷管对发动机推进性能的提高最为明显.爆震波的传播速度及RDE的推进性能随着入口质量流量的增大而逐渐提高,而当量比则存在一个最佳值,使爆震波的传播速度及RDE的推力达到最大.基于混合物的比冲最高能够达到95.21s.
In order to study the influence of nozzle on the performance of rotary detonation engine (RDE), an RDE thrust test bench was designed. The RDE annular combustion chamber has an inner diameter and an outer diameter of 70mm and 80mm respectively and a length of 40mm. Hydrogen and air are used as fuel and Oxidant, using annular gap - jet collided blending mode, the use of high-energy spark plug ignition, and the use of piezoelectric pressure sensor to measure thrust, the experimental study of convergence at the exit of the combustion chamber nozzle, expansion nozzle and Laval nozzle on the engine The results show that when the total inlet mass flow rate is less than 0.126kg / s, it is most obvious that the convergent nozzle enhances the engine propulsion performance under the condition of steady operation of the engine. The propagation velocity of the detonation wave and the propulsion of RDE The performance increases gradually with the increase of inlet mass flow, while the equivalence ratio has an optimal value, which maximizes the propagation velocity of the detonation wave and RDE thrust, and the specific impulse based on the mixture can reach 95.21s.