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ORIGINAL RESEARCH article
Front. Energy Res.
Sec. Process and Energy Systems Engineering
Volume 12 - 2024 |
doi: 10.3389/fenrg.2024.1387367
This article is part of the Research Topic Optimal Design and Efficiency Improvement of Fluid Machinery and Systems: Volume III View all 5 articles
Research on the Pressure Fluctuation Distribution and Rotor-stator Interaction in the Vaneless Region of a pump-turbine of Francis type
Provisionally accepted
Yonggang Lu
1*
Chuanbao Yi
2
Zequan Zhang
3
Haiyang Dong
2
Shuagnquan Xu
2
Xiji Li
2
Chuanzhen Sun
2
Shuaishuai Zhang
2
Zhengwei Wang
1*- 1 Tsinghua University, Beijing, China
- 2 State Grid Xinyuan Shandong Weifang Pumued Storage Co.,LTD., Weifang, China
- 3 Jiangsu University, Zhenjiang, Jiangsu Province, China
The vibration issue of pumped storage power station unit will directly affect the safe and stable operation of the unit, and the pressure pulsation in the vaneless region is an important index to evaluate the stability of the unit. In order to study the pressure fluctuation characteristics of the vaneless region of the pumpturbine in the turbine mode, the unsteady numerical simulation of the maximum head condition and the rated head condition is carried out in this research. The amplitude-frequency characteristics of the pressure fluctuation in the vaneless region under different head and the influence of the internal flow characteristics on the pressure fluctuation are analyzed. The results show that the non-uniform pressure field is formed in the vaneless region due to the rotor-stator interaction (RSI) between the long and short blades of the runner and the guide vanes. The main frequency of pressure pulsation in the vaneless region is 5fn, which is half of the blade passing frequency (BPF), that is, the blade combination passing frequency.The main sub-frequencies are 10fn, 15fn and 20fn. In addition, the amplitude of pressure pulsation at each frequency under the rated head condition is higher than that under the maximum head condition. In a rotating cycle, the discrete blade vortex in the runner flow channel gradually accumulates and evolves into the big scale vortex on the side of the pressure surface of the short blade, which aggravates the pressure fluctuation in the vaneless region. The intensity of the vortex under the rated head condition is larger, which reasonably explains the reason why the pressure fluctuation amplitude under the rated head condition is larger.
Keywords: Pump-turbine, Vaneless region, Pressure pulsation, Rsi, vortex
Received: 17 Feb 2024; Accepted: 25 Jun 2024.
Copyright: © 2024 Lu, Yi, Zhang, Dong, Xu, Li, Sun, Zhang and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Yonggang Lu, Tsinghua University, Beijing, China
Zhengwei Wang, Tsinghua University, Beijing, China
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