AP1000非能动换热器数值模拟

Numerical simulation of AP1000 passive residual heat removal heat exchanger

摘要:

为准确认识AP1000非能动余热排出热交换器的具体换热和流动过程,针对AP1000非能动换热器,应用FLUENT软件对其非稳态传热特性和流动进行研究, 比较分析同一时刻不同位置温度场和流场的分布,以及不同时刻同一位置温度场和流场的变化,分析换热器传热和流动特性随时间的变化,同时对比分析直管形管束和弯形管束对换热器自然对流的影响．分析结果表明:温差、漩涡和回流使温度场和流场相互影响,弯形管束使流体自然对流更加复杂．研究成果有助于分析换热器的自然循环能力,为我国新建的AP1000先进压水堆核电机组的安全运行提供参考．

Abstract:

To accurately know heat transfer and flow processes of AP1000 passive residual heat removal heat exchanger(PRHR HX), and provide a reference for the safe operation of our new AP1000 advanced pressurized water reactor nuclear power plant, FLUENT software is used. By comparative analysis of the distribution of temperature-field and flow-field in different locations at the same time, and the change of temperature-field and flow-field in the same location at different times, we can know the heat transfer and flow characteristics which are changed with time more intuitive, and analyze the effect of straight tubes and elbow tubes on the natural circulation. The results show that the temperature difference, vortex, flow around make the interaction of temperature field and flow field. Due to the influence of elbow tubes structure, the fluid natural convection in the IRWST is more complex.