Pressure Fluctuation Characteristics of a Pump-Turbine in the Hump Area under Different Flow Conditions

IF 2.7 3区 地球科学 Q1 ENGINEERING, MARINE
Kai Zheng, Liu Chen, Shaocheng Ren, Wei Xiao, Yexiang Xiao, Anant Kumar Rai, Guangtai Shi, Zhengkai Hao
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引用次数: 0

Abstract

During the operation of a reversible pump-turbine, a hump area can easily appear under the pump condition, which will greatly affect the performance of a storage unit, with pressure pulsation being the key factor for the stable operation of a pump-turbine. Therefore, in order to explore the pressure pulsation characteristics of each flow component in the hump area, this paper first compared the full characteristics of the model test under different working conditions, and then it analyzed the pressure pulsation characteristics. By analyzing the pressure pulsation characteristics in the unit’s flow component under different flow rates in the hump area, the pulsation rule of a pump-turbine running in the hump area was revealed. It was found that the peak-to-peak value of the draft tube in the hump area was the smallest under the optimal flow condition, and the peak-to-peak value increased along the flow direction, with the rotor and stator interaction (RSI) effects being continuously enhanced. When away from the runner basin, the influence of RSI gradually weakened after leaving the runner. No low frequency was found in the optimal traffic. The peak-to-peak value of the low flow condition increased compared with the optimal flow condition, and the distribution was not uniform. The main frequency of the whole basin was relatively complex, indicating that the flow of water was unstable in the condition of partial load, resulting in the hump area during the unit operation. The research results can provide a theoretical reference for improving the stability of pump-turbines.
不同流量条件下驼峰区泵-涡轮机的压力波动特性
在可逆泵-涡轮机运行过程中,泵工况下很容易出现驼峰区,这将极大地影响蓄能装置的性能,而压力脉动是影响泵-涡轮机稳定运行的关键因素。因此,为了探究驼峰区各流动分量的压力脉动特性,本文首先对比了模型试验在不同工况下的全特性,然后对压力脉动特性进行了分析。通过分析驼峰区不同流量下机组流量分量的压力脉动特性,揭示了驼峰区水泵-水轮机运行的脉动规律。研究发现,在最佳流量条件下,驼峰区牵伸管的峰-峰值最小,峰-峰值沿流量方向逐渐增大,转子和定子相互作用(RSI)效应不断增强。离开流道盆地后,RSI 的影响逐渐减弱。在最佳流量中没有发现低频。与最佳流量条件相比,低流量条件下的峰峰值有所增加,且分布不均匀。整个流域的主频相对复杂,说明在偏载工况下水流不稳定,导致机组运行时出现驼峰区。研究结果可为提高水泵水轮机的稳定性提供理论参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Marine Science and Engineering
Journal of Marine Science and Engineering Engineering-Ocean Engineering
CiteScore
4.40
自引率
20.70%
发文量
1640
审稿时长
18.09 days
期刊介绍: Journal of Marine Science and Engineering (JMSE; ISSN 2077-1312) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to marine science and engineering. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.
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