水蒸气超音速流动非平衡凝结相变研究

Study on non-equilibrium condensation phase change in supersonic steam flow

引入水蒸气真实气体物性,综合考虑相变、相间滑移对水蒸气超音速流场产生的影响,建立了数值模型。通过与Moore实验数据对比验证了所建数值模型的正确性,比较分析了不同模型的计算结果。随后对喷管内水蒸气的超音速流动进行了数值模拟,捕捉到了凝结激波现象,分析了凝结激波对流场参数分布产生的影响。并对喷管内不同进口温度条件下水蒸气的超音速流动进行了计算,结果发现,不同进口温度对水蒸气非平衡凝结发生时的凝结点位置和凝结点处的过冷度有重要的影响:进口温度越高,自发凝结发生位置越靠近喷管出口位置。

Considering the effect of phase change and slip in supersonic steam flow, a conservative numerical model is established with virial equations of steam. The correctness of the numerical model is verified by comparing with the Moore＇s experimental data. And the calculation results of different models are compared and analyzed. Then the numerical simulation of supersonic steam flow in nozzle is analyzed. The condensation shock phenomenon is captured. And the influence of condensation shock on the distribution of flow field parameters is analyzed. In order to study the effect of the inlet temperature on the condensation shock, the supersonic flow of steam at different inlet temperature is calculated. It is found that the temperature of different inlet has an important influence on the condensation point position and the degree of the condensation point of the steam：The higher the inlet temperature, the closer of the condensation position to the exit position of the nozzle.