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首页> 外文会议>International conference on nuclear engineering >NUMERICAL SIMULATION ON 3D FLOW IN THE FUEL TRANSFER CANAL AND LOCAL FLOW FIELD ANALYSIS
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NUMERICAL SIMULATION ON 3D FLOW IN THE FUEL TRANSFER CANAL AND LOCAL FLOW FIELD ANALYSIS

机译：输油管道内3D流动的数值模拟及局部流场分析

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摘要

By application of CFD codes, 3D complex flow field and temperature field in the transfer canal are simulated. It indicates that there is obvious cross-flow in the complex flow path of spent fuel container, and the natural circulation flow brings an inhomogeneous heat-transfer condition to the spent fuel assembly. A model of typical unit of canal is built, and local flow field and temperature field are analyzed with CFD code. The results of thermal hydraulics analysis could be a good reference for nuclear safety research on spent fuel assembly. Considering a conservative operating condition, a case with conservative boundary conditions is investigated by CFD code with 3D model. The result shows that fuel rods in the local region, which are in the container upside and far from holes of wall and roof, get the worst cooling effect, and even maybe boiling occurs in clad surface. Based on the thermal-hydraulics analysis, optimized mechanical designs of container are suggested, the new design would optimize the local flow field, and increase the flow velocity of water, to construct more unhindered convection there, as a result, make spent fuel rods in the bad cooling region get better cooling.
机译：通过应用CFD代码，模拟了输水渠中的3D复杂流场和温度场。这表明乏燃料容器的复杂流动路径中有明显的横流，自然循环流给乏燃料组件带来了不均匀的传热条件。建立了典型渠系模型，并利用CFD代码对局部流场和温度场进行了分析。热工水力分析的结果可为乏燃料组件的核安全研究提供很好的参考。考虑到保守的工作条件，采用带有3D模型的CFD代码研究了边界条件保守的情况。结果表明，位于容器上方且远离墙壁和屋顶孔的局部区域的燃料棒获得的冷却效果最差，甚至在包层表面也可能发生沸腾。基于热工水力分析，提出了优化的容器机械设计，新的设计将优化局部流场，增加水的流速，从而在此处构造更多的无障碍对流，从而使乏燃料棒不良的冷却区域会得到更好的冷却。

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