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本文用二次紊流模型求解N-S方程的方法对冲压发动机二维扩压器的非稳定流进行了数值研究。非稳定流是由扩压器出口平面处的压力扰动所引起的。为模拟燃烧室压力振荡,考虑了出口截面正弦压力脉动为出口平均压力的20％的情况,所形成的流场展示出结尾冲波、分离涡和无粘核心流之间存在着复杂的相互关系。出口平面流动特性对所施加的正弦压力变化呈非线性响应。
In this paper, the method of solving the N-S equation by the secondary turbulence model is used to numerically study the unsteady flow of the two-dimensional diffuser. Unsteady flow is caused by pressure disturbances at the exit plane of the diffuser. To simulate the pressure oscillations in the combustor, the case where the sinusoidal pressure pulsation at the outlet cross-section is taken as 20% of the average outlet pressure is considered. The resulting flow field shows a complex interrelationship between the ending wave, the separation vortex and the non-stick core flow . The exit plane flow behavior responds non-linearly to the applied sinusoidal pressure changes.