为进一步了解超燃冲压发动机的内流特性,优化燃烧室流场,文中运用数值模拟方法对比分析了燃烧室中悬臂斜坡/凹腔不同组合形式对流场掺混特性、稳焰能力以及燃烧效率的影响。研究发现:纵向悬臂斜坡/凹腔组合结构中凹腔后缘的展向涡比横向组合大,且凹腔内温度也更高,稳焰能力更强;纵向组合高湍动能区域更大,掺混效果更优;两种组合造成的燃烧室总压损失差别不大,但纵向组合燃烧效率更高。
In order to further understand the flow characteristics of scramjet engines and optimize the combustion chamber flow field, the numerical simulation has been carried out to investigate the effects of different combination mode of cantilever ramp/cavity in scramjet combustor on mixing characteristics, flame stabilizing ability and combustion efficiency of flow field. The study find that the spanwise vortex of the trailing edge of the cavity in the longitudinal cantilever ramp/cavity combination structure is larger than that of the transverse combination, and the temperature in the cavity is higher and the flame stabilizing ability is better. The high turbulent kinetic energy region of longitudinal combination is larger, and the mixing efficiency is enlarged. There is little difference in the total pressure loss caused by the vertical and the lateral combinations, but the former one has higher combustion efficiency.
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