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针对压水堆的复杂结构特点,对堆芯采用多孔介质模型,建立完整的压力容器堆芯模型,使用商用软件CFX对压力容器堆芯的热工水力特性进行数值模拟,得到偏环运行和典型事故工况下冷却剂的热工水力响应特性。计算结果表明:应用多孔介质模型能有效正确直观显示堆芯的冷却剂温度分布情况,在偏环运行工况下堆芯会出现偏心现象,而通过瞬态事故工况计算结果表明堆芯中上部冷却剂温度最高,对压水堆的热工安全具有一定指导作用。
Aiming at the complex structural characteristics of PWR, a porous media model was used for the core, a complete core model of the pressure vessel was established, and the thermal-hydraulic characteristics of the pressure vessel core were numerically simulated by commercial software CFX. Thermal - hydraulic characteristics of coolant under accident conditions. The calculation results show that the porous media model can effectively and correctly display the coolant temperature distribution in the core, and the eccentricity of the core will appear under the circumstance of eccentric operation. The calculation results of the transient accident conditions show that the upper part of the core The coolant temperature is the highest, which can guide the thermal safety of PWR.