Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode

Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode
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泵工况下多级水泵水轮机第一级驼峰不稳定的非定常流动特性

DOI:
10.1016/j.renene.2018.04.069
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发表时间:
2018-11
期刊:
影响因子:
8.7
通讯作者:
Liu Jun
Liu Jun
中科院分区:
工程技术1区
文献类型:
--
作者:
Yang Jun;Pavesi Giorgio;Liu Xiaohua;Xie Tian;Liu Jun

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本文报道了发生驼峰不稳定的多级水泵水轮机一级非定常流场的流体动力学分析。这一级可以看作是在泵模式下具有多级导叶的离心泵。采用实验和数值方法来帮助理解测试泵内部高度复杂的流动状态。在实验测试中,采用了动态压力测量和流动显示技术。采用独立涡模拟(DES)模型的商业代码计算流型。频率分析表明,驼峰不稳定区存在两种频率恒定的非定常流型。通过对非定常流场的数值和实验分析,研究了这些非定常流场的流体动力学特征,探讨了它们对驼峰不稳定性的成因和贡献。
This article reports the fluid-dynamical analyses of unsteady flow in the first stage of a multistage pump-turbine where hump instability occurs. This stage can be seen as a centrifugal pump with multistage guide vanes in pump mode. Experimental and numerical approaches are adopted to contribute the understanding of the highly complex flow regime inner the test pump. In the experimental test, both dynamic pressure measurement and flow visualization techniques are adopted. A commercial code with detached eddy simulation (DES) model is used to compute the flow regime. The frequency analysis indicates that two unsteady flow patterns with a constant frequency occur in the hump instability region. The numerical and experimental unsteady flow fields are analysed to study the fluid-dynamical features of these unsteady patterns, in order to investigate the origin and reveal their contributions to the hump instability.
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发表时间: 2009-03
影响因子: 3.2
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