| Citation: | Yu Yang, Fang Zhe, Fan Jian, et al. Influence of injection position on heat release characteristics and engine performance of the RBCC[J]. Journal of Aerospace Power, 2026, 41（X）：20250571 doi: 10.13224/j.cnki.jasp.20250571
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Numerical simulations are conducted to investigate the heat release characteristics of an RBCC engine under freestream Mach number 6 conditions. The influence of fuel injection position on flow feature, heat release distribution, combustion mode, and engine performance were analyzed with the aid of logarithmic processing and filter functions. Results showed that moving the injection position upstream shifted the shock train leading edge forward, expanded the high-pressure zone within the flow path, and significantly increased the overall pressure level. It also enlarged the combustion reaction zone, increased the total heat release, and shifted the concentrated heat release region upstream. Furthermore, upstream injection increased the peak heat release rate by reducing the corresponding cross-sectional area, although the shock induced by the fuel strut contributed more significantly to local heat release enhancement via its compression effect. All tested injection positions exhibited dominant diffusion and subsonic combustion modes. Injection upstream of the isolator cavity increased the proportion of premixed combustion, while injection of the central strut sidewall was more conducive to supersonic combustion. Within the studied range, upstream injection effectively improved combustion efficiency, thrust, and specific impulse, with injection upstream of the isolator cavity yielding the optimal engine performance.
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