气-液组合横向射流中气体种类的影响

吸气式旋转爆震发动机中燃料的良好雾化对爆震燃烧的组织极其重要, 气-液组合横向射流是其中一种重要的燃料喷注技术。为获取气体种类在超声速来流中对其的影响, 通过数值方法对液体射流穿透深度和辅助射流气体分布进行研究。采用Euler-Lagrange方法研究不同气体射流对液体射流的作用规律, 结果表明: 气体射流通过激波结构降低局部来流动量通量提升液体射流穿透深度, 相同的来流条件下气体射流动量通量越大, 液体射流穿透深度越高, 且主要影响扩张段之前的流场区域, 气体种类的变化对于后场液体射流穿透深度和雾化特性几乎无影响。 

Influence of Gas Species on Combined Gas-Liquid Jets

The excellent atomization of the fuel in the air-breathing rotating detonation engine is extremely important to the detonation combustion. The gas-liquid combined transverse jet is one of the vital fuel injection technologies. Numerical methods were used to investigate the liquid penetration depth and auxiliary jet gas distribution. The Euler-Lagrange method was used to study the effect of different gas jets on the liquid jet. The results show that the gas jet reduces the momentum flux of the local incoming flow through the shock wave structure and increases the penetration depth of the liquid jet. Under the same incoming flow conditions, the greater the momentum flux of the gas jet, the higher the penetration depth of the liquid jet. It mainly affects the flow field area before the expansion section. The change of gas species has almost no effect on the penetration depth and atomization characteristics of liquid jet in the rear flow field.