Investigations on Pressure Fluctuations in the S-Shaped Region of a Pump–Turbine

Hongjie Wang, Jianpeng Wang, Ruzhi Gong, Chaoying Shang, Deyou Li and Xianzhu Wei
Additional contact information
Hongjie Wang: State Key Laboratory of Hydro-Power Equipment, Harbin 150040, China
Jianpeng Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Ruzhi Gong: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Chaoying Shang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Deyou Li: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Xianzhu Wei: State Key Laboratory of Hydro-Power Equipment, Harbin 150040, China

Energies, 2021, vol. 14, issue 20, 1-19

Abstract: Hydraulic pumped storage is a special power generation and electricity shortage technology, which is usually operated with thermal power and nuclear power units, and plays a key role in ultra-high voltage and smart grid. Pressure fluctuations are the main reasons for the instability of the S-shaped region of pump–turbines, which seriously affects their lifespan and operation stability. To reveal the mechanism and propagation law of pressure fluctuations in the S-shaped region as well as numerical simulations at the turbine, the braking and the reverse pump operating conditions of a pump–turbine were carried out. Numerical results were validated using the performance experiments, and the generation mechanism and propagation law of pressure fluctuation were analyzed in detail. The analyses show that high-amplitude pressure fluctuations mainly occur in the braking and reverse pump operating conditions. Under the braking condition, a 0.49- f n low-frequency pressure fluctuation was captured, which is caused by the rotation of the backflow in the vanes. Under the reverse pump condition, a 0.19- f n low-frequency pressure fluctuation was confirmed, which is caused by the periodic rotation of the vortex between the vaneless space. This study has important guiding significance for practical engineering application.

Keywords: pump–turbine; S-shaped region; pressure fluctuation; frequency characteristic (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/20/6683/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/20/6683/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:20:p:6683-:d:656831

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().