Numerical investigation of flame stability and heat release laws of kerosene spray combustion in RBCC engine

The flame stability and heat release laws of kerosene spray combustion are the core technologies in RBCC engine. The Detached Eddy Simulation numerical method is used to investigate the performance of RBCC engine under different incoming flow conditions. The analytical results show that under the condition of high incoming total temperature, the cavity can play the role of flame stabilization, but under the relatively low incoming flow total temperature condition, cavity could not achieve a sufficient promise for stability of the flame. It must use other method to compensate the loss of heat caused by liquid kerosene evaporation. Considering the pressure in combustion chamber will affect the inlet working condition directly, the position of fuel injection should not be in front of the chamber, further, in order to achieve the maximum combustion efficiency and engine thrust, multistage fuel injection approach that combined the upstream and downstream fuel injection is the feasible solution.