| Citation: | Kou Yitao, Guo Shanguang, Wu Yun, et al. Experimental study on impact of kerosene injection position on performance of rotating detonation combustors[J]. Journal of Aerospace Power, 2026, 41（10）：20250153 doi: 10.13224/j.cnki.jasp.20250153
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The effects of isolator injection, divergent section injection, and multi-point mixing injection on the propagation and performance characteristics of kerosene/air rotating detonation combustors (RDCs) were investigated. Focusing on typical operating conditions of ramjet RDCs, changes in combustion efficiency and total pressure gain were studied. It was found that with increasing equivalence ratio, different injector configurations influenced the propagation characteristics of detonation waves. Steady detonation, unsteady detonation and deflagration were observed in the experiment. Different injector configurations also had certain impact on the combustion efficiency and total pressure gain. Overall, under varying equivalence ratios, multi-point mixing injection in the isolator and divergent section exhibited superior combustion efficiency. Combustion efficiency showed an initial increase followed by fluctuation with increasing equivalence ratio. In the experiments, the maximum combustion efficiency of 89.5% was observed at an equivalence ratio of 0.653. The total pressure gain of the RDC gradually increased with the increasing the equivalence ratio. The highest effective total pressure gain occurred at an equivalence ratio of 0.644, with a peak effective total pressure gain of −0.171. The injection in the divergent section demonstrated superior overall performance. However, it needs to be combined with auxiliary injection in the isolator to improve the organization of the combustion process, thereby further optimizing the injection configuration.
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