LES of Internal Flows in a Mixed-Flow Pump With Performance Instability
LES of Internal Flows in a Mixed-Flow Pump With Performance Instability
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DOI：
10.1115/fedsm2002-31205
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发表时间：
2002
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影响因子：
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通讯作者：
C. Kato;H. Mukai;A. Manabe
中科院分区：
文献类型：
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作者：
C. Kato;H. Mukai;A. Manabe
本文介绍了大涡模拟（LES）的内部流动的高比转速混流泵在低流量比，测量的头部流动特性表现出弱的不稳定性。为了处理流场中的运动边界界面，发展了一种从多个动态参考系施加重叠网格的有限元方法。该方法通过应用域分解编程模型实现为并行程序。预测的泵头再现的不稳定性，并同意定量以及与他们的测量等价物，虽然预测的失速发生在比在测量中的流量比稍低。叶轮的入口和出口截面处的切向速度分量的相位平均分布也与激光多普勒测速仪（LDV）测量的结果进行了比较。计算和测量的轮廓之间已经获得了合理的良好协议。因此，开发的LES程序似乎是一个很有前途的设计工具，特别是对于高比转速混流泵的非设计评估。
This paper describes large eddy simulation (LES) of the internal flows of a high-specific-speed mixed-flow pump at low flow-rate ratios over which measured head-flow characteristics exhibits weak instability. In order to deal with a moving boundary interface in the flow field, a form of the finite-element method in which overset grids are applied from multiple dynamic frames of reference has been developed. The method is implemented as a parallel program by applying a domain-decomposition programming model. The predicted pump heads reproduce the instability and agree quantitatively well with their measured equivalents although the predicted stall takes place at somewhat lower flow-rate ratio than in the measurements. The phase-averaged distributions of the meridional- and tangential-velocity components at the impeller’s inlet and exit cross-sections were also compared with those measured by a Laser-Doppler velocimetry (LDV). Reasonably good agreements have been obtained between the computed and measured profiles. The developed LES program thus seems to be a promising design tool for a high specific-speed mixed-flow pump particularly for off-design evaluations.Copyright © 2002 by ASME