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 102206, China
e-mail: y.zhang@ncepu.edu.cn

Ting Chen

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

Jinwei Li, Jixing Yu

China Institute of Water Resources and
Hydropower Research,
Beijing 100048, China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 29, 2016; final manuscript received February 7, 2017; published online April 27, 2017. Assoc. Editor: Bart van Esch.

J. Fluids Eng 139(7), 074501 (Apr 27, 2017) (4 pages) Paper No: FE-16-1558; doi: 10.1115/1.4036161 History: Received August 29, 2016; Revised February 07, 2017

The characteristics of pressure fluctuations in a prototype reversible pump turbine (RPT) 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 tube cone, and draft tube elbow). Our findings reveal that at the low-load condition, the pressure fluctuation is quite significant (e.g., above 12% in terms of nondimensional 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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Zhang, Y. , Tang, N. , Niu, Y. , and Du, X. , 2016, “ Wind Energy Rejection in China: Current Status, Reasons and Perspectives,” Renewable Sustainable Energy Rev., 66, pp. 322–344. [CrossRef]
Zhang, Y. , Zhang, Y. , and Wu, Y. , 2017, “ A Review of Rotating Stall in Reversible Pump Turbine,” Proc. Inst. Mech. Eng., Part C (accepted).
Hasmatuchi, V. , Farhat, M. , Roth, S. , Botero, F. , and Avellan, F. , 2011, “ Experimental Evidence of Rotating Stall in a Pump-Turbine at Off-Design Conditions in Generating Mode,” ASME J. Fluids Eng., 133(5), p. 051104. [CrossRef]
Widmer, C. , Staubli, T. , and Ledergerber, N. , 2011, “ Unstable Characteristics and Rotating Stall in Turbine Brake Operation of Pump-Turbines,” ASME J. Fluids Eng., 133(4), p. 041101. [CrossRef]
Cavazzini, G. , Alberto, C. , Giorgio, P. , and Guido, A. , 2016, “ Analysis of the Unstable Behavior of a Pump-Turbine in Turbine Mode: Fluid-Dynamical and Spectral Characterization of the S-Shape Characteristic,” ASME J. Fluids Eng., 138(2), p. 021105. [CrossRef]
Botero, F. , Hasmatuchi, V. , Roth, S. , and Farhat, M. , 2014, “ Non-Intrusive Detection of Rotating Stall in Pump-Turbines,” Mech. Syst. Signal Process., 48(1–2), p. 162. [CrossRef]
Olimstad, G. , Nielsen, T. , and Børresen, B. , 2012, “ Dependency on Runner Geometry for Reversible-Pump Turbine Characteristic in Turbine Mode of Operation,” ASME J. Fluids Eng., 134(12), p. 121102. [CrossRef]
Olimstad, G. , Nielsen, T. , and Børresen, B. , 2012, “ Stability Limits of Reversible Pump Turbines in Turbine Mode of Operation and Measurements of Unstable Characteristic,” ASME J. Fluids Eng., 134(11), p. 111202. [CrossRef]
Li, Z. , Wang, Z. , Wei, X. , and Qin, D. , 2016, “ Flow Similarity in the Rotor–Stator Interaction Affected Region in Prototype and Model Francis Pump-Turbines in Generating Mode,” ASME J. Fluids Eng., 138(6), p. 061201. [CrossRef]
Xia, L. , Cheng, Y. , You, J. , Zhang, X. , Yang, J. , and Qian, Z. , 2017, “ Mechanism of the S-Shaped Characteristics and the Runaway Instability of Pump-Turbines,” ASME J. Fluids Eng., 139(3), p. 031101. [CrossRef]
Zeng, W. , Yang, J. , Hu, J. , and Yang, J. , 2016, “ Guide-Vane Closing Schemes for Pump-Turbines Based on Transient Characteristics in S-Shaped Region,” ASME J. Fluids Eng., 138(5), p. 051302. [CrossRef]
Yang, J. , Pavesi, G. , Yuan, S. , Cavazzini, G. , and Ardizzon, G. , 2015, “ Experimental Characterization of a Pump–Turbine in Pump Mode at Hump Instability Region,” ASME J. Fluids Eng., 137(5), p. 051109. [CrossRef]
Pacot, O. , Chisachi, K. , Yang, G. , Yoshinobu, Y. , and François, A. , 2016, “ Large Eddy Simulation of the Rotating Stall in a Pump-Turbine Operated in Pumping Mode at a Part-Load Condition,” ASME J. Fluids Eng., 138(11), p. 111102. [CrossRef]
Egusquiza, E. , Valero, C. , Valentin, D. , Presas, A. , and Rodriguez, C. G. , 2015, “ Condition Monitoring of Pump-Turbines. New Challenges,” Measurement, 67, p. 151. [CrossRef]
Egusquiza, E. , Valero, C. , Huang, X. , Jou, E. , Guardo, A. , and Rodriguez, C. , 2012, “ Failure Investigation of a Large Pump-Turbine Runner,” Eng. Failure Anal., 23, p. 27. [CrossRef]
Martin, C. S. , 1986, “ Stability of Pump-Turbines During Transient Operation,” 5th International Conference on Pressure Surges BHRA, Hannover, Germany, Sept. 22–24, pp. 61–71.
Gentner, C. , Sallaberger, M. , Widmer, C. , Bobach, B.-J. , Jaberg, H. , Schiffer, J. , Senn, F. , and Guggenberger, M. , 2014, “ Comprehensive Experimental and Numerical Analysis of Instability Phenomena in Pump Turbines,” IOP Conf. Ser.: Earth Environ. Sci., 22(3), p. 032046. [CrossRef]
Zhang, X. , Cheng, Y. , Xia, L. , Yang, J. , and Qian, Z. , 2016, “ Looping Dynamic Characteristics of a Pump-Turbine in the S-Shaped Region During Runaway,” ASME J. Fluids Eng., 138(9), p. 091102. [CrossRef]
Dörfler, P. , Sick, M. , and Coutu, A. , 2013, Flow-Induced Pulsation and Vibration in Hydroelectric Machinery (Engineer's Guidebook for Planning, Design and Troubleshooting), Springer Science & Business Media, Berlin.
Cencîc, T. , Hoĉevar, M. , and Ŝirok, B. , 2014, “ Study of Erosive Cavitation Detection in Pump Mode of Pump–Storage Hydropower Plant Prototype,” ASME J. Fluids Eng., 136(5), p. 051301. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Geometry of the prototype pump turbine with the locations of four monitoring points (points 1–4, respectively) for the pressure fluctuation measurement in the flow passage: (a) vertical view (including spiral casing, stay/guide vanes and impeller) and (b) side view of the draft tube (including draft tube cone and draft tube elbow)

Grahic Jump Location
Fig. 2

Nondimensional peak-to-peak values of pressure fluctuation (ΔH/H) versus load variations (from 25.41% to 96.82%) at four monitoring points

Grahic Jump Location
Fig. 3

Cascade plot of frequency spectrums at point 1 for nine investigated load conditions

Grahic Jump Location
Fig. 4

Cascade plot of frequency spectrums at point 2 for nine investigated load conditions

Grahic Jump Location
Fig. 5

Cascade plot of frequency spectrums at point 3 for nine investigated load conditions

Grahic Jump Location
Fig. 6

Cascade plot of frequency spectrums at point 4 for nine investigated load conditions

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