关键词: 高超声速飞行器, 反作用控制系统, 二次燃烧效应, 化学反应模型, 数值模拟

Abstract: Under conditions of wide operational envelopes, the secondary combustion effects of the jet in the reaction control system (RCS) of hypersonic vehicles are difficult to predict quickly and accurately. Focusing on a generic cone-cylinder-flare hypersonic configuration, this study conducts high-fidelity multiphysics numerical simulations to systematically investigate the impact of jet secondary combustion on the aerodynamic characteristics under varying Mach numbers and flight altitudes. To accelerate the simulation process, a simplified chemical reaction model tailored for RCS jet secondary combustion is proposed. Research shows that the secondary combustion effect of the jet significantly affects the distribution of pressure coefficients. The simulation results have a maximum error of no more than 15% compared with literature results. The simplified chemical reaction model can reduce the computation time of the chemical reaction source term by 50%. Under speed conditions of 4-15 Ma and altitude conditions of 15-40 km, the thrust amplification factor increases with Mach number and decreases with altitude. These findings provide a crucial theoretical reference for the performance prediction and design optimization of jet-based reaction control systems.

Key words: hypersonic vehicle, reaction control system, afterburning effect, chemical reaction model, numerical