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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Study on Influence of Turbulence Model Selection on Prediction of Flow Distribution and Hot Spot Fuel Temperature in Prismatic HTGR Cores
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Study on Influence of Turbulence Model Selection on Prediction of Flow Distribution and Hot Spot Fuel Temperature in Prismatic HTGR Cores

机译：湍流模型选择对方形高温气冷堆堆芯流分布和热点燃料温度预测的影响

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AbstractCFD analyses were performed for a cross-flow experiment in prismatic HTGR core fuel blocks to investigate the effect of turbulence models on the prediction of the core flow distribution. A transition model was considered in addition to a fully turbulent model because the flow in the coolant channels of the fuel block is turbulent whereas that in the bypass gap between the blocks is laminar. Additional analyses were carried out to investigate how the variation of the coolant channel flow dependence on the turbulence model selection affected the hot spot fuel temperature. The results showed that the gamma-theta transition model led to a better prediction than the others because it reasonably simulated the flow region where the bypass and cross gaps intersected. The result for the hot spot fuel temperature, however, showed that the temperature change caused by the turbulence model selection is so small that it can be absorbed in a margin of the engineering design. Therefore, the fully turbulent model...
机译：摘要针对棱柱形HTGR堆芯燃料块的交叉流实验进行了CFD分析，以研究湍流模型对堆芯流分布预测的影响。除了完全湍流模型之外，还考虑了过渡模型，因为燃料块的冷却剂通道中的流动是湍流的，而燃料块之间的旁路间隙中的流动是层流的。进行了其他分析，以研究冷却剂通道流量对湍流模型选择的依赖性如何影响热点燃料温度。结果表明，γ-θ过渡模型比其他模型有更好的预测，因为它合理地模拟了旁路和交叉间隙相交的流动区域。但是，热点燃料温度的结果表明，由湍流模型选择引起的温度变化非常小，可以在工程设计的余量中吸收。因此，完全湍流的模型...

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