压力容器外部冷却系统冷却水池温度场的实验研究及分析

Experimental Investigation and Analysis on Temperature Distribution in Water Pool of External Reactor Vessel Cooling System

压力容器外部非能动冷却系统采用换料水池作为冷却水源。在浮升力驱动的自然循环流动作用下,冷却水池内会逐渐出现热分层现象。本实验基于先进压水堆压力容器外部冷却系统模拟装置REPEC实验回路,通过测量实验系统内冷却水箱的温度场空间分布,对冷却水池的热分层与混合现象、发展规律和主要影响因素进行了实验分析。结果表明:实验水箱内温度场分布差异主要表现在高度方向;循环流量是影响热分层的重要参数,而水箱工质初始温度的影响非常微弱;针对本实验的无量纲一维瞬态温度场方程分析表明,水箱内温度场的发展规律主要受对流传热控制。

In the external reactor vessel passive cooling system, the refueling water pool is used as the heat trap. Driven by buoyancy force, thermal stratification phenomena occur spontaneously in the pool. The thermal stratification and mixing phenomena, development process and main influencing factors in the refueling water pool with the REPEC test facility were studied. The experimental results show that the temperature distribution in the experimental water tank varies with height, the circulation flow is one of the most important {actors which influence the thermal stratification process in the water tank, and the effect of initial water temperature is negligible. The analysis result of the 1-D non-dimensional transient temperature field equation shows that the development of the temperature field in the water tank is mainly controlled by convective heat transfer.