| Citation: | ZHU Long, ZHAO Nannan, LYU Yajin, et al. Influence of injection structure on the mixing characteristics of CH4-O2 rotating detonation engine[J]. Journal of Aerospace Power, 2025, 40（11）：20240578 doi: 10.13224/j.cnki.jasp.20240578
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In order to investigate the influence of different injection structures on the fuel mixing characteristics inside the annular combustion chamber of a rotating detonation engine, numerical simulation analysis of the cold-state mixing flow field was conducted using the commercial software FLUENT, and the three-dimensional Navier-Stokes （N-S） equations were solved using a density-based scheme. Based on the annular gap-both sides orifice injection structure taken as the basic model, and under the same inlet conditions, the impacts of fuel injection angle and position on the mixing characteristic of the cold-state flow field were analyzed. The research results indicated as the injection angle increased, the unevenness of blending rised and the total pressure loss increased. Within the range of 60° to 180° for the injection angle, 60° exhibited the best mixing effect and minimum total pressure loss. As the methane injection position moved forward, the distance between the injection point and the combustion chamber increased, and the blending distance increased, leading to an enhancement in the mixing effect. Under non-premixed conditions, due to the influence of lateral methane jets, a complex and varied vortex structure was generated in the expansion section, enhancing the mixing effect of methane-oxygen.
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