Distribution of Pressure Fluctuations in a Prototype Pump Turbine at Pump Mode
Distribution of Pressure Fluctuations in a Prototype Pump Turbine at Pump Mode
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DOI：
10.1155/2014/923937
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发表时间：
2014-02
影响因子：
2.1
通讯作者：
Yuekun Sun;Z. Zuo;Shuhong Liu;Jintao Liu;Yulin Wu
中科院分区：
文献类型：
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作者：
Yuekun Sun;Z. Zuo;Shuhong Liu;Jintao Liu;Yulin Wu
压力波动是水泵水轮机运行中非常重要的特性。许多研究都集中在特定位置的压力脉动特征（幅度和频率），但很少有研究提到水泵水轮机内压力脉动的分布。在本文中，使用 SSTk − ω 湍流模型进行 3D 数值模拟，以预测原型泵水轮机在泵模式下的压力脉动分布。模拟了不同质量流量和不同导叶开度的三个工况点。数值结果显示了叶片通过频率 (BPF) 及其谐波下的压力波动如何沿整个流路方向以及沿周向变化。 BPF 是无叶空间中的第一主频率。该频率下的压力波动分量向上游（至尾水管）和下游（至螺旋套管）快速衰减。相比之下，3BPF 处的压力波动分量以几乎恒定的幅度向上游和下游传播。压力波动的幅度和频率也沿无叶空间中的不同圆周位置变化。当质量流量和导叶开度不同时，沿两个方向的压力脉动分布基本不同。
Pressure fluctuations are very important characteristics in pump turbine's operation. Many researches have focused on the characteristics (amplitude and frequencies) of pressure fluctuations at specific locations, but little researches mentioned the distribution of pressure fluctuations in a pump turbine. In this paper, 3D numerical simulations using SSTk − ω turbulence model were carried out to predict the pressure fluctuations distribution in a prototype pump turbine at pump mode. Three operating points with different mass flow rates and different guide vanes’ openings were simulated. The numerical results show how pressure fluctuations at blade passing frequency (BPF) and its harmonics vary along the whole flow path direction, as well as along the circumferential direction. BPF is the first dominant frequency in vaneless space. Pressure fluctuation component at this frequency rapidly decays towards upstream (to draft tube) and downstream (to spiral casing). In contrast, pressure fluctuations component at 3BPF spreads to upstream and downstream with almost constant amplitude. Amplitude and frequencies of pressure fluctuations also vary along different circumferential locations in vaneless space. When the mass flow and guide vanes’ opening are different, the distribution of pressure fluctuations along the two directions is different basically.