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Research Papers: Operations, Applications and Components

Investigation on Maximum Upsurge and Air Pressure of Air Cushion Surge Chamber in Hydropower Stations

[+] Author and Article Information
Jiachun Liu

College of Water Conservancy and
Hydropower Engineering, Hohai University,
Nanjing 210098, China
e-mail: liujiachun@hhu.edu.cn

Jian Zhang

College of Water Conservancy and
Hydropower Engineering,
Hohai University,
Nanjing 210098, China
e-mail: jzhang@hhu.edu.cn

Sheng Chen

College of Water Conservancy and
Hydropower Engineering,
Hohai University,
Nanjing 210098, China
e-mail: chensheng@hhu.edu.cn

Xiaodong Yu

College of Water Conservancy and
Hydropower Engineering,
Hohai University,
Nanjing 210098, China
e-mail: yuxiaodong_851@hhu.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 14, 2016; final manuscript received January 9, 2017; published online February 8, 2017. Assoc. Editor: Akira Maekawa.

J. Pressure Vessel Technol 139(3), 031603 (Feb 08, 2017) (8 pages) Paper No: PVT-16-1195; doi: 10.1115/1.4035790 History: Received October 14, 2016; Revised January 09, 2017

The maximum upsurge (MU) and the maximum air chamber pressure (MACP) are critical parameters for the design of air cushion surge chamber (ACSC) in hydropower stations. In this paper, the existence of the MU and the MACP are proved under compound conditions. The theoretical formula predicting the most dangerous superposition moment of the MU and the MACP under compound condition is derived, and the influence factors are analyzed as well. To verify the accuracy of the formula, the rigid model based on Runge-Kutta method (RKM) and the elastic model based on the method of characteristics (MOC) are established, respectively, according to the parameters of the ACSC system in the practical hydropower station. The numerical results agree well with the theoretical predictions. In addition, the MU and the MACP under three control conditions are simulated, respectively, and the results show that when the cross-sectional area of throttled orifice is small, the MU and the MACP occur under the successive load rejection condition (SLR); when the cross-sectional area is large, the MU and the MACP occur under the load rejection after load acceptance condition (LRLA).

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Figures

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Fig. 1

Schematic diagram of diversion system in a hydropower station with ACSC

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Fig. 4

Absolute water level variation under three different conditions

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Fig. 5

Absolute chamber pressure variation under three different conditions

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Fig. 6

The diversion system layout of case 2

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Fig. 2

The MU under the SLR and water level change under the initial condition

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Fig. 3

The MU under the LRLA and water level change under the initial condition

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Fig. 7

The MU under LRLA and water level change under initial condition

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Fig. 8

The MACP under LRLA and water level change under initial condition

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