基于CFD方法的非能动余热排出系统数值模拟

本文应用FLUENT软件对APl000的非能动余热排出热交换器和换料水箱进行了数值模拟，分析了不同c型传热管数量和冷却剂入口温度对热交换器换热性能和换料水箱内热分层、自然循环现象的影响。分析表明，总体通流面积不变，随着传热管数量增加，热交换器出口温度变小，水箱水温整体提升，热分层现象显著，自然循环趋势明显；质量流量不变，随着冷却剂入口温度的增加，入口流速增加，热交换器出口温度变大，但降温幅度也变大，水箱平均水温升高，热分层范围扩大，自然循环流速加快。

Numerical Simulation of PRHR System Based on CFD

In this paper numerical simulation of PRHR HX and IRWST is demonstrated using FLUENT, and different numbers of C-type heat transfer tubes and coolant inlet temperature＇s effect on the residual heat removal capacity of PRHR HX, IRWST thermal stratification and natural circulation have been re- searched. It＇s found that at a constant flow area when heat transfer tubes＇ number is increased and outlet temperature of PRHR HX is lower, the whole water temperature of IRWST is higher, and thermal stratifi- cation and natural circulation are more oblivious. At a constant mass flow when inlet temperature of coolant is increased, inlet flow velocity increases and outlet temperature of PRHR HX is higher. But on the other hand the cooling rate increases at the same time, the average temperature of IRWST is higher, the range of thermal stratification expands and the velocity of natural circulation increases.