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Influence of Debris on Water Intake Gratings in Small Hydroelectric Plants: An Experimental Study on Hydraulic Parameters

Author

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  • Natalia Walczak

    (Department of Hydraulic and Sanitary Engineering, Poznan University of Life Sciences, 60-637 Poznań, Poland)

  • Zbigniew Walczak

    (Department of Construction and Geoengineering, Poznan University of Life Sciences, 60-637 Poznań, Poland)

  • Jakub Nieć

    (Department of Hydraulic and Sanitary Engineering, Poznan University of Life Sciences, 60-637 Poznań, Poland)

Abstract

Deposition of debris on the screens of hydroelectric power plants translates into measurable economic losses. Occurring plant debris, although it is an organic material, is characterised by different forms and structure. It is often leaves, branches, and grasses in lowland areas, while in mountainous regions, broken boughs and trees can be expected. On the trash racks of power plants, debris may be deposited in different forms, shapes, and places. This work aims to determine the impact of the degree of submergence of debris on the values of the force acting on the racks. This paper analyzes the influence of the rectangular shape of the debris deposited on the trash racks and its degree of submergence and weight on the obtained values of the force acting on the racks as a result of water pressure, which directly affects the hydraulic losses and productivity of hydroelectric power plants. Our research confirms the negative influence of the deposited plant debris on the value of forces recorded on the gratings. The increase in the recorded force, and thus the resistance on the grating, is obviously dependent on the degree of obstruction of the debris by the grating obtained by changing the degree of debris immersion and its weight. In the case of changing the degree of submergence, the increase in force recorded on the gratings varied during the experiment from about 25% recorded for the fully submerged debris compared to that of the partially submerged debris for the mass of 100 g; in comparison, an increase of about 31% was recorded for that of the mass of 200 g. However, comparing the values of the forces recorded on the obstructed grids to that of the forces recorded on the clean grids, the increase ranged from about 15–53%.

Suggested Citation

  • Natalia Walczak & Zbigniew Walczak & Jakub Nieć, 2021. "Influence of Debris on Water Intake Gratings in Small Hydroelectric Plants: An Experimental Study on Hydraulic Parameters," Energies, MDPI, vol. 14(11), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3248-:d:567417
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    References listed on IDEAS

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    Cited by:

    1. Mateusz Hämmerling & Natalia Walczak & Tomasz Kałuża, 2023. "Analysis of the Influence of Hydraulic and Hydrological Factors on the Operating Conditions of a Small Hydropower Station on the Example of the Stary Młyn Barrage on the Głomia River in Poland," Energies, MDPI, vol. 16(19), pages 1-22, September.
    2. Guillaume Bon & Ludovic Chatellier & Yves Le Guer & Cécile Bellot & Xavier Casiot & Laurent David, 2024. "Pressure Loss Modeling for Multi-Stage Obstacles in Pressurized Ducts," Energies, MDPI, vol. 17(14), pages 1-19, July.
    3. Natalia Walczak & Zbigniew Walczak & Tomasz Tymiński, 2022. "Laboratory Research on Hydraulic Losses on SHP Inlet Channel Trash Racks," Energies, MDPI, vol. 15(20), pages 1-18, October.

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