Numerical Study and Sensitivity Analysis of PRHR HX Transient Heat Transfer Performance
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摘要: 以美国非能动型先进压水堆AP600的非能动余热交换器简化试验模型为FLUENT的数值计算模型,采用标准k-ε湍流模型和自然对流Boussinesq模型,对非能动余热交换器和内置换料水箱的自然对流换热特性进行数值模拟。模拟结果与试验结果基本一致,较好地再现了各瞬态工况下非能动余热交换器换热过程中温度、速度分布与加热时间的变化特性。敏感性分析表明,导流板结构及进口形式对自然对流影响很小,升高水箱初始温度或增加换热管数量均能加强换热效果。Abstract: Natural convection in AP600 （American Passive Advanced Pressurized Water Reactor） passive residual heat removal heat exchanger （PRHR HX） is numerically studied with FLUENT. Numerical investigation using standard k-ε model and Boussinesq model is performed. The transient numerical results show that the heat transfer performance of the PRHR HX and IRWST are consistent with AP600 experimental results. The sensitivity analysis has the following conclusions:a. the effect of baffle position and inlet construction on heat transfer performance is very small and b. with the increase of the number of heat exchanger pipes or the initial temperature of water in IRWST,the heat transfer will be enhanced.
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