Japan Aerospace Exploration Agency has been investigating scramjet engines in Kakuda Space Center using Ram Jet Engine Test Facility et al. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The fuel injected from the vertical injector on the side wall stays near the side wall and the tap wall along the engine. The steep fuel distribution is an obstacle for the engine performance completion. In order to solve the problem, the authors focus on the influence of cowl shock wave on the fuel distribution. In this paper the authors describe results of comparison the cowl shock wave in combustion condition to the one in air flow condition by using CFD and discuss the influence of the combustion on the cowl shock wave in the engine.
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