The Influence of Flame Stabilizer Position on the Heat Release Characteristics of RBCC Combustor

The Rocket Based Combined Cycle (RBCC) engine is characterized by a wide flight envelope, multiple modes of operation and excellent overall performance, making it one of the ideal power sources for future reusable air-to-air round-trip transportation and near-space vehicles. In order to carry out the research on the influence of heat release distribution and performance in the combustor of RBCC, and to realize the stability and high efficiency of the wide-area operation of the RBCC engine, this paper utilizes numerical simulation to analyze the influence of the position of the flame stabilizer in the rocket ram and ramjet modes of the RBCC, respectively, and at the same time, analyzes the law of the coupling influence of the position of the flame stabilizer and the area of the flow channel. It is found that in the ram mode, the forward and backward movement of the flame stabilizer reduces the peak heat release rate, but the forward movement of the flame stabilizer lengthens the combustion interval, and the combustion efficiency can be improved by 1.7%; in the ram mode, the forward and backward movement of the flame stabilizer leads to a more concentrated heat release distribution and a higher peak, and the performance of the combustor is improved, and the combustion efficiency can be improved by 5.6% and 2.6% in the incoming flow from Ma=4 and Ma=6, respectively. However, the heat release distribution resulting from the forward movement of the flame stabilizer is more difficult to match with the profile, and the inlet channel stability is more likely to be disrupted.