Technical Brief

Hydraulic Stability Analysis of a Large Prototype Francis Turbine Based on Field Test

[+] Author and Article Information
Weiyu Wang, Qijuan Chen, Donglin Yan

Key Laboratory of Transients in Hydraulic Machinery,
Wuhan University,
Ministry of Education,
Wuhan 430072, China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 13, 2018; final manuscript received July 17, 2018; published online August 20, 2018. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 140(11), 114501 (Aug 20, 2018) (4 pages) Paper No: FE-18-1174; doi: 10.1115/1.4040973 History: Received March 13, 2018; Revised July 17, 2018

Long time field tests of a 200 MW prototype Francis turbine over its full range of operation were conducted. From the experimental data, the time domain and frequency domain characteristics of the pressure fluctuations in the Francis turbine at different operation conditions were analyzed. Furthermore, the reason for the amplitude increase of pressure fluctuations and the correlation between the vibration and the pressure fluctuation was studied by using a multidimensional frequency band energy ratio analysis method. Based on the above analysis, some hydraulic stability characteristics of the large prototype Francis turbine are found, and other results are also obtained.

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Fig. 1

The arrangement of measuring points

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Fig. 2

The diagram of sensors' installation mode: (a) vibratio sensor, (b) shaft oscillation sensor, and (c) pressure fluctuation sensor

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Fig. 3

Trend diagram of pressure fluctuations at each measuring point

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Fig. 4

The 3D surface graph of pressure fluctuation changing with load and water head

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Fig. 5

Three-dimensional frequency spectrum of the pressure fluctuation

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Fig. 6

Frequency bands energy distribution of pressure fluctuation under different load

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Fig. 7

The oscillation amplitude variation trend of guide bearings

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Fig. 8

Frequency bands energy distribution of shaft oscillation over the full range of operation: (a) lower guide bearing X, (b) lower guide bearing Y, (c) turbine guide bearing X, and (d) turbine guide bearing Y



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