气体与液体两相连续旋转爆轰波二维数值模拟研究

为研究汽油与富氧空气两相连续旋转爆轰发动机的工作特性，使用非结构化三角形网格守恒元与求解元(CE/SE)方法对气体与液体（简称气液）两相连续旋转爆轰波进行了二维数值模拟。通过数值模拟获得连续旋转爆轰波传播的不同模态，研究了进气总压和当量比对两相连续旋转爆轰波的影响，分析了不同模态下连续旋转爆轰发动机的工作特性，并对数值模拟结果进行了试验验证。结果表明：液滴的蒸发和剥离过程，延缓了液滴燃料的燃烧，导致了两相爆轰压力和温度的不完全耦合，降低了两相爆轰波的传播速度；当量比对连续旋转爆轰波的传播模态影响较大，当量比越低、越容易形成单波模态，当量比越高、越容易产生多个波头；单波模态的爆轰波压力和传播速度波动最小，双波模态居中，三波模态波动最大；发动机推力波动规律与压力波动规律相反，单波模态推力波动最大，双波次之，三波模态推力波动最小；计算所得旋转爆轰波波速与试验结果吻合较好，旋转爆轰波流场与实验研究定性一致。数值研究方法发展了非结构化CE/SE算法，研究结果对气液两相连续旋转爆轰发动机的试验研究和工程应用具有一定的指导意义。

Two-dimensional Numerical Research on Two-phase Rotating Detonation Waves

In order to investigate the gasoline/oxygen-enriched air continuously rotating detonation engines(RDE), the conservation elements and solution elements method (CE/SE method) based on the unstructured triangular meshes is used for the simplified 2D simulation of two-phase continuously RDE. The different propagation modes of rotating detonation waves (RDW) were obtained. The influences of total inlet pressure and equivalent ratio were studied and the operating performance of RDE was analyzed. The results show that the evaporation and stripping of droplets delay the combustion of fuel, which leads to the incomplete coupling of detonation peak pressure and peak temperature. The equivalent ratio has a great influence on the propagation mode of rotating detonation waves. A single-wave RDW is easily generated under low equivalent ratio,and a multiple RDW is generated under higher equivalent ratio. The detonation wave pressure and velocity fluctuations of single-wave mode are the smallest, those of double-wave mode are moderate and those of three-wave mode are the largest, but the thrust fluctuation law of propagation mode is opposite to that of pressure fluctuation. The thrust fluctuation of single-wave mode is the largest, followed by double-wave mode, and the thrust fluctuation of three-wave mode is the smallest. The calculated velocity and flow field of the rotating detonation agree well with the experimental results. The numerical research is meaningful for the development of unstructured-mesh CE/SE method. The calculated results have a guidance effect on the experimental research and engineering application of two-phase RDE. Key