核电厂全范围模拟机流固换热耦合并行技术研究

Parallel Technology of Fluid-Solid Heat Transfer in Full Scope Simulator of Nuclear Power Plants

基于RELAP5程序热工水力计算原理,研究热构件壁面温度及热流密度耦合并行技术在核电厂全范围模拟机中的应用。整体模型通过热构件壁面温度或热流密度拆分为两个模型耦合并行计算,计算结果分别与整体计算的结果进行对比。结果表明:在间壁式换热器的热构件模型中,热流密度作为耦合参数时计算结果不准确;壁面温度作为耦合参数时可以准确计算。将温度耦合技术用于典型四环路压水堆核电站蒸汽供应系统的仿真计算,计算结果表明:间壁式换热器的热构件模型的温度耦合并行计算能有效提高CPU利用效率和计算速度,为模拟机的实时计算提供更多的保障。

Based on the theory of thermal hydraulic calculation of RELAP5,the application of the coupled parallel technology by heat flux and wall temperature in the full scope simulator of nuclear power plants is studied.The model splits up into two coupling parallel computing models by wall temperature or heat flux of the heat structure.Comparing the results with the overall calculation results,it shows that:the results of coupling calculation by heat flux of recuperative heat exchanger are inaccuracy;and the results of coupling calculation by wall temperature are consistent with the actual value.The simulation results of the steam supply system of the typical nuclear power plant by using coupling parallel computing model by wall temperature shows that:the coupling parallel computing by wall temperature of recuperative heat exchanger effectively improves the CPU utilization and the computation speed,which provides more guarantee for the real-time calculation of the simulation.