非能动安全壳冷却系统传热关系式研究

Research on Heat Transfer Correlation for Passive Containment Cooling System

利用低雷诺数区域的计算流体力学（CFD）模型对非能动安全壳冷却系统（PCCS）COPAIN冷凝试验装置进行模拟，针对其对流传热试验工况进行理论计算，并用COPAIN试验数据进行验证。利用验证后的CFD模型将COPMN试验对流换热工况参数扩展到温差为40-80℃区域，通过理论计算得到对流传热Nusselt数，并拟合出与Dittus-Boelter关系式形式相似的传热关系式。最后，将经该关系式闭合的集总参数法程序冷凝模型的冷凝传热结果与西屋公司为AP600开展的Wisconsin冷凝试验数据进行对比，结果显示，经新关系式闭合的冷凝传热模型计算结果更接近于试验值。

In this paper, a CFD model in low Mach number regime was used to model the convection heat transfer tests in COPAIN facility, and validated using COPAIN experimental data. Using the CFD model to extend the experimental parameters in convection heat transfer to high temperature difference regime（40---80~C）, compute the Nusselt number for convection heat transfer, and a heat transfer correlation suitable for the PCCS design was derived. The condensation heat and mass transfer model closed by the new correlation was validated using the Wisconsin condensation tests data. Comparing with Dittus-Boelter correlation, the computed results are more close to the tests data.