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首页> 外文期刊>International Journal of Heat and Fluid Flow >Invariant analysis of the Reynolds stress tensor for a nuclear fuel assembly with spacer grid and split type vanes
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Invariant analysis of the Reynolds stress tensor for a nuclear fuel assembly with spacer grid and split type vanes

机译：具有间隔栅格和分型叶片的核燃料组件的雷诺应力张力的不变分析

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摘要

Invariant analysis of the Reynolds stress tensor anisotropy can give an accurate and deep intuitive understanding of the turbulent structure of a turbulent flow. Lumley's triangle has proven to be a powerful representation of the invariant analysis of the second-order statistics collection provided by the Reynolds stress tensor. In the present work the spectral element code Nek5000 has been used to investigate the turbulent structure of the flow across a pressurized water reactor spacer grid with split type mixing vanes. Wall-resolved large eddy simulation of the flow in a prototypical rod bundle geometry at Re = 14,000 and P/D = 1.32 are performed and validated against particle image velocimetry data. The results are then used to perform an in-depth invariant analysis. The results show a reorganization of the Reynolds stresses components in the downstream region of the spacer grid. The mixing vanes orientation produces a symmetric behavior between sub-channels. The turbulent structure in the fully developed region has the typical behavior of fully-developed channel flow turbulence. When averaging the state across regions of the sub-channels, we observed a transition from disk-like turbulence in the mixing vanes region to rod-like turbulence in the fully developed region.
机译：对雷诺的不变分析应力张量各向异性可以提高对湍流流动的湍流结构的准确性和深刻的理解。 Lumley的三角形已被证明是对雷诺斯压力张量提供的二阶统计收集的不变分析的强大表示。在本工作中，光谱元件码NEK5000已被用于研究流过加压水反应器间隔栅的流动的湍流结构，具有分割式混合叶片。在RE = 14,000和P / D = 1.32处进行原型杆束几何形状的流动的壁分辨大涡流模拟，并针对粒子图像速度数据进行验证。然后使用结果进行深入的不变分析。结果表明，雷诺的重组应力应力在间隔件栅格的下游区域中的组分。混合叶片取向在子通道之间产生对称行为。完全发达区域中的湍流结构具有完全开发的通道流动湍流的典型行为。当平均子信道区域跨越状态时，我们观察到从混合叶片区域中的磁盘状湍流的过渡到完全发达区域中的杆状湍流。

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