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Research Papers: Fundamental Issues and Canonical Flows

Experimental Study of the Francis Turbine Pressure Fluctuations and the Pressure Fluctuations Superposition Phenomenon Inside the Runner

[+] Author and Article Information
Zhongxin Gao

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: gaozhx@iwhr.com

Wenruo Zhu

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: kenanzwr@126.com

Long Meng

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: menglong429@gmail.com

Jianguang Zhang

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: zhangjg@iwhr.com

Fei Zhang

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: spiritgiant@126.com

Luoping Pan

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: panlp@iwhr.com

Li Lu

China Institute of Water Resources and
Hydropower Research,
A1 Fuxing Road,
Beijing 100038, China
e-mail: luli@iwhr.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 9, 2017; final manuscript received October 15, 2017; published online December 21, 2017. Assoc. Editor: Bart van Esch.

J. Fluids Eng 140(4), 041208 (Dec 21, 2017) (9 pages) Paper No: FE-17-1217; doi: 10.1115/1.4038535 History: Received April 09, 2017; Revised October 15, 2017

The pressure fluctuations in both the rotating runner and the other fixed components in a model Francis turbine under various loads were experimentally measured by means of onboard measuring equipment in the runner and data storage device on the shaft in this study. Large pressure fluctuations were observed under both small guide vane opening and large guide vane opening conditions. Flow separation at the blade suction surface led to large pressure fluctuations for small guide vane openings, the unsteady flow around the inlet on the blade pressure side led to large pressure fluctuations for large openings. The pressure fluctuations correlation between the runner and other components of the turbine, mainly the draft tube, was analyzed in detail for both small guide vane opening (12 deg) and large guide vane opening (30 deg). The results show that the pressure fluctuations in the runner space increased by the superposition of draft tube vortex rope pressure fluctuations and runner inter blade vortices pressure fluctuations, resulting in much larger pressure fluctuations in the runner space than in other components.

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References

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Figures

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Fig. 4

Measurement points in spiral case, vaneless area, and draft tube

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Fig. 5

Data acquisition system

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Fig. 6

Calibration curve and the relative error of the pressure sensor LL-250

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Fig. 2

Arrangement of measurement points on blade surface

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Fig. 1

Closed-loop experimental system for the model turbine

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Fig. 7

Measured characteristic curve of the model turbine

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Fig. 8

Case inlet, vaneless space, and draft tube pressure pulsation mixed frequency amplitudes for various with unit flow rates (n11 = 63 rpm)

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Fig. 9

Pressure pulsation mixed frequency amplitudes along different streamlines on blade surface (n11 = 63 rpm)

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Fig. 10

Pressure pulsation mixed frequency amplitudes at all the measurement points along the flow direction under small guide vane opening (n11 = 63 rpm, α = 12 deg)

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Fig. 11

Pressure pulsation mixed frequency amplitudes at all the measurement points along the flow direction under large guide vane opening (n11 = 63 rpm, α = 30 deg)

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Fig. 12

Spectral plots for the typical measurement points

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Fig. 13

Blade channel vortices (n11 = 63 rpm, α = 12 deg)

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Fig. 14

Runner and draft tube fractional frequency amplitudes caused by the draft tube vortex rope (n11 = 63 rpm, α = 12 deg)

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