RETRAN-3D和RELAP5/MOD4.0程序两相临界流模型评价

Evaluation of Two-Phase Critical Flow Model Based on the RETRAN-3D and RELAP5/MOD4.0

摘要: 为研究系统分析程序中临界流模型的准确性和喷放过程动态趋势，采用RETRAN-3D和RELAP5/MOD4.0程序对高温高压喷放实验进行了模拟计算，获得了高压容器内空泡份额、温度、压力及剩余水装量随时间的变化趋势。计算与实验对比表明：在短期效应计算过程中，RETRAN-3D程序所用临界流模型计算出的热工水力参数趋势和大小与实验比较接近，RELAP5程序所用临界流模型计算喷放过程趋势与实验吻合，泄压速率稍快，瞬时临界流流速略偏高；在长期效应计算过程中，RETRAN-3D程序因汽液两相计算出现负压力而终止计算，RELAP5程序则可以进行长时间的瞬态计算。

Abstract: To study the accuracy of critical flow model in system analysis code and the discharge process dynamic trend, the RETRAN-3D and RELAP5/MOD4.0 are used to simulate the high temperature and pressure discharge experiment. The trends of void fraction, temperature, pressure and residual water filling quantity in the high pressure vessel are achieved. The results show that during the short-time effect calculation process, the trends and numerical quality of the thermal-hydraulic parameters calculated by the critical flow model of RETRAN-3D are closely coincident with experimental results. And the trends of the RELAP5 code are also coincident with experimental results, but the de-pressure speed is much fast and the critical mass flow is a little high. During the long- time effect calculation process, the RETRAN-3D code can’t run as negative pressure results, while the RELAP5 code can execute long-time run.