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首先用Khabenskii方法预测了并联蒸发管内的两相流动不稳定边界,发现当出口为过热蒸汽时Khabenskii方法预测值与实验值有较大偏差,最高达80%。然后采用RELAP5/MOD3.4程序模拟垂直并联蒸发管道的流动工况,得到的流量脉动特性与实验值能较好地吻合,同时其预报的两相流不稳定边界也与实验结果很好吻合,误差在25%以内.最后用RELAP5/MOD3.4程序分析了质量流速、入口阻力、出口阻力、入口过冷度、入口压力等因素对并联直流蒸发管内两相流动不稳定性的影响。
First, the Khabenskii method is used to predict the unstable boundary of two-phase flow in the evaporating tube. It is found that the Khabenskii method has a deviation of up to 80% from the experimental value when the outlet is superheated steam. Then the RELAP5 / MOD3.4 program was used to simulate the flow conditions of the vertical parallel evaporation pipe. The obtained flow pulsation characteristics were in good agreement with the experimental values, and the predicted two-phase flow instability boundaries were in good agreement with the experimental results. The error is less than 25% .Finally, the influence of mass flow rate, inlet resistance, outlet resistance, inlet undercooling, inlet pressure and other factors on the instability of two-phase flow in a parallel-connected evaporating tube was analyzed by RELAP5 / MOD3.4 program.