Pump hump characteristic research based on mass transfer equation
Pump hump characteristic research based on mass transfer equation
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DOI：
10.1088/1757-899x/72/3/032016
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
D. M. Liu;Y. Z. Zhao;X. B. Liu;Y. Ma;W. Wang
中科院分区：
文献类型：
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作者：
D. M. Liu;Y. Z. Zhao;X. B. Liu;Y. Ma;W. Wang
当前现代抽水蓄能电站的发展目标是提高运行灵活性、扩大水力机械的运行范围（特别是在抽水模式下）和更高的可靠性。泵送要求是关键的设计驱动因素，因为即使涡轮模式性能非常出色，项目的成功也取决于泵水轮机提供所需的最大泵扬程并在泵模式下可靠启动。泵驼峰（水泵最高扬程不稳定工作点）是水泵水轮机振动的不稳定源，对水泵高扬程运行造成严重损害。因此，本文给出了基于数值模拟和实验结果的泵驼峰和空化数。泵驼峰对空化数的影响很敏感。随着空化数的减少，流量特性曲线（如水头流量曲线、H-Q曲线）上的驼峰逐渐减小直至消失。通过多相 CFD 计算预测空化流仍然是一项非常具有挑战性的任务。介绍了该领域正在进行的工作的一些成果。本文讨论了H-Q曲线上的驼峰随空化数的变化。
The current development of modern pumped storage plants aims towards a higher flexibility in operation, an extended operation range of the hydraulic machine (especially in the pumping mode), and a higher reliability. The pumping requirements are the crucial design drivers, since, even if the turbine mode performance is very sound, the success of a project depends also on the pump turbine delivering the required maximum pump head and starting reliably in pump mode. Pump hump (pump instability working points at highest head) which is an instability source to the pump-turbine vibration is a serious damage to the pump operation on high head. So the pump hump and cavitation number based on the numerical simulation and experiment results are shown in this paper. The pump hump is sensitive affected by the cavitation number. With the cavitation number decreasing, the hump on flow characteristic curve (e.g. head-flow rate curve, H-Q curve) is gradually decreasing until vanished. Predicting cavitating flows with multi-phase CFD computations is still a very challenging task. Some results of ongoing work in this field are presented. The hump on H-Q curve with cavitation number is discussed in this paper.