NDLI: Dynamic analysis on pressure fluctuation in vaneless region of a pump turbine

Content Provider	Springer Nature Link
Author	Li, DeYou Gong, RuZhi Wang, HongJie Xiang, GaoMing Wei, XianZhu Liu, ZhanSheng
Copyright Year	2015
Abstract	As the pump turbine tends to be operated with high head and high rotational speed, the study of stability problems becomes more important. The pump turbine usually works at operating conditions where the guide vanes experience strong vibrations. However, most traditional studies were carried out based on constant GVO (guide vane opening) simulations. In this work, dynamic analysis on pressure fluctuation in the vaneless region of a pump turbine model was conducted using a dynamic mesh method in turbine mode. 3D unsteady simulations were conducted where GVO was closed and opened by 1° from the initial 18°. Detailed time domain and frequency domain characteristics on pressure fluctuation in the vaneless region under different guide vane rotational states compared with constant GVO simulations were investigated. Results show that, during the guide vanes oscillating process, the low and intermediate frequency components in the vaneless region are significantly different. The amplitudes of pressure fluctuation are higher than those with constant GVO simulations, which agree better with the experimental data. In addition, the pressure fluctuation increases when GVO is opened, and vice versa. It can be concluded that pressure fluctuation in the vaneless region is strongly influenced by the oscillating of the guide vanes.
Starting Page	813
Ending Page	824
Page Count	12
File Format	PDF
ISSN	16747321
Journal	Science in China Series E: Technological Sciences
Volume Number	58
Issue Number	5
e-ISSN	18691900
Language	English
Publisher	Science China Press
Publisher Date	2015-03-28
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pump turbine pressure fluctuation vaneless region dynamic mesh Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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