0
Technical Brief

Experimental Study of Load Variations on Pressure Fluctuations in a Prototype Reversible Pump Turbine in Generating Mode

[+] Author and Article Information
Yuning Zhang

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing China 102206
zhangyn02@gmail.com

Ting Chen

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing China 102206
chentingemail@163.com

Jinwei Li

China Institute of Water Resources and Hydropower Research, Beijing China 100048
jwli01@foxmail.com

Jixing Yu

China Institute of Water Resources and Hydropower Research, Beijing China 100048
jxyu01@foxmail.com

1Corresponding author.

ASME doi:10.1115/1.4036161 History: Received August 29, 2016; Revised February 07, 2017

Abstract

The characteristics of pressure fluctuations in a prototype reversible pump turbine is investigated within a wide range of load conditions with a focus on the low load condition (e.g. 25% of rated power) with the aid of pressure signals obtained at several typical recording points (i.e. spiral casing, vaneless space, draft cone tube and draft elbow tube). Our findings reveal that at low load condition, the pressure fluctuation is quite significant (e.g. above 12% in terms of non-dimensional values) especially in the vaneless space and spiral casing with the dominant frequency being the blade passing frequency. Furthermore, based on the characteristics of pressure fluctuation, the investigated load range is divided into three zones. For zone I (with low load), the amplitude of pressure fluctuation is highest and the dominant mechanism is the rotor-stator interaction in the vaneless space with the blade passing frequency. For zone II (with medium load), the amplitude of pressure fluctuation is less prominent (below 5%) and the dominant mechanism is the low-frequency fluctuations induced by the swirling vortex rope. For zone III (with high load), the amplitude of pressure fluctuation is quite limited (less than 3%) and the dominant mechanism is still the rotor-stator interaction but with the dominant frequency being the harmonics of blade passing frequency. Detailed examples for all three zones are given and discussed with quantitative descriptions of propagation mechanism of fluctuation.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In