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对存在自发凝结的湿蒸汽两相流动进行研究,在欧拉/欧拉坐标系下建立数学模型。气相采用N-S方程,液相凝结过程应用对所构造的多阶参数积分方法进行求解,对汽轮机叶栅中跨音速两相流动进行了数值模拟。与实验数据对比,结果正确预测了凝结冲波的位置和强度,证明所采用模型的准确性和全面性。由液相参数的分布和变化趋势可知吸力面汽流膨胀率和尾缘处蒸汽流动情况是影响主流中液相参数分布的主要因素。
The wet steam two-phase flow with spontaneous condensation is studied, and a mathematical model is established under the Euler / Euler coordinate system. The N-S equation is adopted for the gas phase, and the multi-order parameter integration method is applied to the liquid-phase condensation process to simulate the transonic two-phase flow in the turbine cascade. Compared with the experimental data, the results correctly predicted the location and intensity of the coagulation wave and proved the accuracy and comprehensiveness of the model. According to the distribution and trend of the liquid phase parameters, the main factors that affect the liquid phase parameter distribution in the mainstream are the flow expansion rate at the suction side and the steam flow at the trailing edge.