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为了更清楚地认识RBCC亚燃模态热力喉道生成机理与规律,通过三维数值模拟,研究了不同燃料喷注位置、凹腔位置、当量比以及火箭流量等影响RBCC燃烧室流道内放热分布的因素,分析了不同放热分布对于热力喉道生成的影响。研究结果表明在放热量足够形成热力喉道的前提下,放热分布相比放热量对热力喉道生成位置的影响更大,并且热力喉道不会形成于主放热区内,提高掺混、增加燃料当量比等使放热量增大的方法会伴随30%~50%的主放热区间长度的增加,对于热力喉道生成位置的影响能力有限。对于RBCC燃烧室,调节火箭流量是一种更有效也更容易实现热力喉道位置宽范围调节的方法,调节范围可以达到燃烧室长度的24%。
In order to understand the mechanism and rule of thermal throat generation in RBCC more clearly, the influence of different fuel injection position, cavity position, equivalence ratio and rocket flow on the exothermic distribution in RBCC combustion chamber was studied by three-dimensional numerical simulation The effects of different exothermic distributions on thermal throat formation were analyzed. The results show that the exothermic distribution has more influence on the generation location of thermal throats than the exothermic ones under the condition that the exothermic heat is enough to form thermal throats, and the thermal throats will not form in the main exothermic zone, , Increasing the ratio of fuel equivalence to increase the exothermic heat will be accompanied by an increase in the length of the main exothermic zone of 30% -50%, and the influence on the location of thermal throats will be limited. For the RBCC combustor, adjusting the rocket flow is a more efficient and easier way to achieve a wide range of thermo-throat position adjustments up to 24% of the combustion chamber length.