轴对称结构RBCC发动机超燃模态试验和数值模拟

为研究轴对称结构RBCC发动机超燃模态下的点火和燃烧性能,进行了地面直连试验。采用中心支板火箭与小支板组喷注相结合的方式作为点火和火焰稳定方式,并对燃料喷注方案进行了研究。试验与数值模拟结果表明,采用这种点火方式能实现轴对称结构RBCC发动机的可靠点火和稳定燃烧。二次燃料采取多级喷注的方式能充分利用流道中的氧气,实现较充分的燃烧,但应控制燃料喷注比例。双支板组的加入,能促进燃料与中心空气流的充分掺混,提升燃烧效率,获得较优的燃烧性能。

Experiment and numerical simulation on scramjet mode of axisymmetric RBCC engine

To study the ignition and combustion performance of axisymmetric RBCC engine in scramjet mode,experiments were carried out on the direct-connected test-bed.The combination of the strut-rocket and the injection of pylons was adopted as the way of ignition and flame holding,and the injection schemes of the fuel were investigated.The results of the experiment and numerical simulation indicate that this way of ignition could achieve reliable ignition and steady combustion.Using the manner of multiple injections could fully make use of oxygen and achieve sufficient combustion,but the proportion of the fuel injection should be controlled.By using double pylons,the mixing between the fuel and central air is promoted to increase the combustion efficiency and obtain good combustion performance.