喷管对旋转爆震发动机性能影响的实验

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. 

Experiment of effect of nozzle shapes on the performance of rotating detonation engine

In order to study the effect of different nozzles on the performance of rotating detonation engine(RDE), a thrust test bed of RDE was designed. The inside and outside diameters of RDE combustor were 70mm and 80mm, respectively. The length of the combustor was 40mm. H₂ and air were used as fuel and oxidant respectively. The fuel and oxidizer were separately supplied through arrays of orifices and slot, respectively with impinging jets to promote the mixing. The RDE was ignited by the high-energy spark plugs and the thrust was measured with a piezoelectric force sensor. In these experiments, the working performance of the engine with converging nozzle, diverging nozzle and the Laval nozzle was studied. The results show that: within RDE stability work scope, the converging nozzle is better than others in improving thrust performance when inlet mass flow rate is less than 0.126kg/s. Detonation wave velocity and the thrust performance of RDE increases with the increase of inlet mass flow rate. Detonation wave velocity and thrust of RDE all reach maximum when equivalence ratio reaches an optimal value. Specific impulse of RDE based on the mixture can reach 95.21s.