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Comparison on Hydraulic Characteristics of Vertical and Horizontal Air-Cushion Surge Chambers in the Hydropower Station under Load Disturbances

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  • Tingyu Xu

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Sheng Chen

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Jian Zhang

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Xiaodong Yu

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Jiawen Lyu

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Haibin Yan

    (Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada)

Abstract

Hydroelectric energy is an increasingly vital and effective renewable energy for modern society. The protective effect on the water hammer in the pipeline, the operational stability of the hydropower system, and the flow regime in the air-cushion surge chamber (ACSC) are three main problems during the design of the hydropower station with an ACSC. Comprehensively comparing the above issues between the horizontal and vertical ACSCs is meaningful. This study established the one-dimensional (1D) model based on the Method of Characteristics (MOC) under large load disturbances (LLD) and the rigid water column theory under small load disturbances (SLD). At the same time, the three-dimensional (3D) model was built based on the Volume of Fluid (VOF) to obtain a more detailed flow regime in the ACSC under the load acceptance condition. The results showed that the vertical ACSC was superior to the horizontal one for its large safe water depth, smaller maximum air pressure, and more stable flow under LLD. In contrast, the horizontal one was better than the vertical one for its extensive water area to calm the SLD during the transient process and smaller fluctuation of the surge under SLD. This study will provide a reference for a future project on selecting the structure of the ACSC.

Suggested Citation

  • Tingyu Xu & Sheng Chen & Jian Zhang & Xiaodong Yu & Jiawen Lyu & Haibin Yan, 2023. "Comparison on Hydraulic Characteristics of Vertical and Horizontal Air-Cushion Surge Chambers in the Hydropower Station under Load Disturbances," Energies, MDPI, vol. 16(3), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1501-:d:1056205
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    References listed on IDEAS

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    1. Mohsen Besharat & Reza Tarinejad & Mohammad Taghi Aalami & Helena M. Ramos, 2016. "Study of a Compressed Air Vessel for Controlling the Pressure Surge in Water Networks: CFD and Experimental Analysis," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 30(8), pages 2687-2702, June.
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