The Suppression of Hump Instability inside a Pump Turbine in Pump Mode Using Water Injection Control
The Suppression of Hump Instability inside a Pump Turbine in Pump Mode Using Water Injection Control
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DOI：
10.3390/pr11061647
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发表时间：
2023-05
期刊：
影响因子：
3.5
通讯作者：
Jun Yang;Xianhua Feng;Xiaohua Liu;Tao Peng;Zhijie Chen;Zihang Wang
中科院分区：
文献类型：
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作者：
Jun Yang;Xianhua Feng;Xiaohua Liu;Tao Peng;Zhijie Chen;Zihang Wang
抽水蓄能电站水泵涡轮机泵态驼峰失稳对电站的安全稳定运行提出了重大挑战。为了实现更精确的数值模拟，本文基于Tait方程建立了弱可压缩水模型。使用这个模型，它被发现，发病的驼峰不稳定性是密切相关的增加引起的失速旋转扩散器内的水力损失。在此基础上，提出了在水泵涡轮机导叶内喷水的流动控制方法，以抑制流动的不稳定性并优化驼峰区。研究结果表明，注水方法可以减轻水力损失，抑制不稳定的结构，并减少扩散器内的脉动幅度，最终延迟驼峰区域的出现，以降低流量条件。该研究有助于拓宽水泵水轮机安全稳定运行的范围。
The occurrence of hump instability in pump mode within a pump turbine poses a significant challenge to the safe and stable operation of Pumped Storage Power Plants (PSPP). To achieve more precise numerical simulations, this paper establishes a weakly compressible model of water based on the Tait equation. Using this model, it is discovered that the onset of hump instability is closely linked to an increase in hydraulic losses induced by stalled rotation within the diffuser. Then, a flow control approach employing water injection into the guide vanes of a pump turbine is proposed in order to suppress flow instabilities and optimize the hump region. The findings reveal that the water injection approach can mitigate hydraulic losses, suppress unstable structures, and diminish the pulsation amplitude within the diffuser, ultimately delaying the emergence of the hump region to lower flow mass conditions. This study is helpful in widening the range of the safe and stable operation of pump turbines in pump mode.