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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >PREDICTION OF TIP-LEAKAGE FLOW IN AXIAL FLOW COMPRESSOR WITH SECOND MOMENT CLOSURE
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PREDICTION OF TIP-LEAKAGE FLOW IN AXIAL FLOW COMPRESSOR WITH SECOND MOMENT CLOSURE

机译：带有第二矩关断的轴流压气机尖端泄漏流量的预测

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摘要

An innovative analysis based on second-moment closure (SMC), incorporating proper modelling of low-Re-number and wall proximity effects is adopted in conjunction with numerical model based on an in-house parallel finite element code for the prediction of a 3D linear compressor cascade flow with tip clearance. The strong interaction between the tip leakage vortex, the mainstream, the passage vortex and the other turbulent structures causes important portion of energy losses and it influences the overall performance of the compressors. A systematic comparison of the prediction of the proposed SMC with respect to a linear eddy viscosity closure (standard k-ε) and experiments is carried out. In the tip leakage the turbulent flow is characterized by an high level of anisotropy induced by complex shear effects. The present predictions demonstrates that second moment closures feature a superior capability to reproduce all major phenornenological features and mean flow parameters of turbomachinery flows.
机译：基于第二矩闭合（SMC）的创新分析结合了低重数和壁邻近效应的正确建模，并结合了基于内部并行有限元代码的数值模型来预测3D线性压缩机叶栅间隙，带叶尖间隙。尖端泄漏涡流，主流，通道涡流和其他湍流结构之间的强烈相互作用导致了能量损失的重要部分，并影响了压缩机的整体性能。系统地比较了所提出的SMC相对于线性涡流粘度封闭（标准k-ε）的预测结果，并进行了实验。在尖端泄漏中，湍流的特征在于复杂剪切效应引起的高度各向异性。目前的预测表明，二阶矩闭合具有再现涡轮机械流的所有主要现象学特征和平均流参数的卓越能力。

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