RBCC发动机燃料喷注位置变化对混合燃烧模式燃烧的影响

为了研究混合燃烧模式下燃料喷注位置对燃烧的影响,通过数值模拟的方法,研究了喷注位置变化时,流道组分质量分数分布、高温放热区域及流道压强分布的变化规律.结果表明,混合燃烧模式中,喷注位置变化对燃烧流场影响很大.在燃烧室中,燃料喷注位置靠前能给燃烧带来帮助,提高燃料与二次来流的掺混能力,并且由于燃料与一次火箭高温羽流相互掺混等影响提前,加快燃料的雾化蒸发,促进燃烧流场的火焰传播,减少煤油点火延迟时间,提高了燃烧效率.因此为了提高混合燃烧模式下的燃烧性能,应尽可能选择燃烧室前端位置进行燃料喷注. 

Numerical investigation of combustion about injection positions in rocket induced secondary combustion of RBCC engine

In order to investigate the influence on combustion by changing the injection positions in the rocket induced secondary combustion,the numerical simulation was used to study the rule of the distribution of component in the flow,the area of high temperature heat release and the distribution of pressure in the flow.The results show that:the combustion flow is obviously affected by changing the injection positions.In the combustor,the combustion performance could be improved by putting the fuel injection position forwards,helping to strengthen the mixing capability of fuel.For the fuel mixed ahead the flame of primary rocket,it accelerates the fuel spray evaporation effect,improves the flame spread and increases the combustion efficiency.In order to improve the performance of combustion in the rocket induced secondary combustion,the fuel injection positions should be placed at front end in the combustor.