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Research Papers: Flows in Complex Systems

Transient Pressure Analysis of a Prototype Pump Turbine: Field Tests and Simulation

[+] Author and Article Information
Jinhong Hu

State Key Laboratory of Water Resources and
Hydropower Engineering Science,
Wuhan University,
Wuhan 430072, China
e-mail: jinhonghu@whu.edu.cn

Jiandong Yang

State Key Laboratory of Water Resources and
Hydropower Engineering Science,
Wuhan University,
Wuhan 430072, China
e-mail: jdyang@whu.edu.cn

Wei Zeng

State Key Laboratory of Water Resources and
Hydropower Engineering Science,
Wuhan University,
Wuhan 430072, China;
School of Civil, Environmental and
Mining Engineering,
University of Adelaide,
Adelaide 5005, SA, Australia
e-mail: wzeng@whu.edu.cn

Jiebin Yang

State Key Laboratory of Water Resources and
Hydropower Engineering Science,
Wuhan University,
Wuhan 430072, China
e-mail: 294513358@qq.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 12, 2017; final manuscript received January 5, 2018; published online March 16, 2018. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 140(7), 071102 (Mar 16, 2018) (10 pages) Paper No: FE-17-1341; doi: 10.1115/1.4039258 History: Received June 12, 2017; Revised January 05, 2018

The transient behaviors of a prototype pump turbine are very important to the safe operation of a pumped-storage power plant. This is because the water hammer pressure during transient events affects the pressure surges in the spiral case (SC) and the draft tube (DT). In addition, the transient pressure pulsations in the vaneless space (VL) are important in the evaluation of the life of the runner. Although several detailed studies have been conducted on the water hammer pressure of a hydropower plant, very few have considered the transient pressure pulsations that occur in the pump turbine. The objective of the present study was to determine the characteristics of the transient pressure pulsations of a 300-MW prototype Francis pump turbine during load rejection and power failure. For this purpose, the frequency features in the steady-state were first analyzed using fast Fourier transform. A Savitzky–Golay filter was then used to extract the water hammer pressure and pulsating pressure from the acquired raw pressure signals. Further, a one-dimensional (1D) method of characteristics (MOC) mathematical model of the pump-turbine was established and used to simulate the transient variations of the flow discharge during transient events, to enable the division of the transient operation conditions into several domains. Finally, the characteristics of the transient pressure pulsations in the SC, vaneless space, and DT were investigated in the time and frequency domains. This paper also discusses the causes of the pressure pulsations that occur under different modes of operation of a pump turbine.

Copyright © 2018 by ASME
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Figures

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Fig. 4

Dimensionless pressure pulsations in the SC, vaneless space, and DT in the steady-state of OP1: (a) time domain and (b) frequency domain

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Fig. 3

Locations of the pressure sensors installed in the prototype pump turbine

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Fig. 2

Layout of the pumped-storage power plant

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Fig. 1

Four-quadrant characteristic curves of the pump turbine

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Fig. 5

Dimensionless pressure pulsations in the SC, vaneless space, and DT in the steady-state of OP2: (a) time domain and (b) frequency domain (b)

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Fig. 6

Dimensionless guide vane closing schemes for OP1 and OP2

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Fig. 7

Normalized measured pressures and time-averaged pressures in the SC, vaneless space, and DT for (a) OP1 and (b) OP2

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Fig. 8

Comparison of results of field tests and TOPSYS simulations: (a) OP1 and (b) OP2

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Fig. 9

Transient trajectories of the operating point simulated by TOPSYS

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Fig. 10

Transient pressure pulsations in the SC, vaneless space, and DT for OP1

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Fig. 15

Spectrogram of the pressure pulsations in the SC for OP2

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Fig. 11

Transient pressure pulsations in the SC, vaneless space, and DT for OP2

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Fig. 12

Spectrogram of the pressure pulsations in the SC for OP1

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Fig. 13

Spectrogram of the pressure pulsations in the VL for OP1

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Fig. 14

Spectrogram of the pressure pulsations in the DT for OP1

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Fig. 16

Spectrogram of the pressure pulsations in the VL for OP2

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Fig. 17

Spectrogram of the pressure pulsations in the DT for OP2

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