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为了深入了解水蒸气喷射泵内流场结构,采用文献[1]给出的物理模型,在保持其他条件不变情况下,采用计算流体力学模拟得到不同背压下喷射泵内部压力分布图和混合室内迹线图,模拟结果与实验数据有较好的一致性。通过分析迹线图中的边界层脱离现象和压力分布图中压力的关系,得出高压力梯度作用导致了引射流体边界层分离,而边界层分离后导致有效区减小,造成引射系数急剧下降。
In order to gain a better understanding of the structure of the flow field in a water jet pump, the physical model given in reference [1] was used to simulate the internal pressure distribution and mixing of the jet pump under different back pressures while keeping the other conditions unchanged. Indoor trace, simulation results and experimental data have good consistency. By analyzing the relationship between the boundary layer detachment in the trace and the pressure in the pressure distribution chart, it is concluded that the high pressure gradient leads to the separation of the boundary layer of the injection fluid, and the separation of the boundary layer leads to the reduction of the effective area, A sharp decline.