Mechanism of the influence of sand on the energy dissipation inside the hydraulic turbine under sediment erosion condition

Xijie Song, Yongyao Luo and Zhengwei Wang

Energy, 2024, vol. 294, issue C

Abstract: Sediment erosion can lead to a general decrease in hydraulic performance of hydraulic turbines and an increase in energy dissipation. In this paper, aiming the characteristics of SE at the clearance the erosion model was modified. The purpose is to study the influence of sediment erosion on the energy dissipation inside the hydraulic turbine. Research shows that the blade is most severely worn near the lower ring of the runner, which can lead to structural loss and hydraulic model changes. The impact of particle size on clearance erosion is much greater than that in a large space flow channel. The particle size affects the impact angle and impact velocity of particles, and is more pronounced at the clearance. The larger the particle size, the greater the acceleration of the jet within the guide vane clearance, exacerbating the SE and leakage of the guide vane clearance. The jet from the guide vane clearance propagates into the runner blade channel, exacerbating energy dissipation. SE can cause the local structure undergoes changes, leading to an increase in local jet flow and deterioration of flow patterns, increasing local energy dissipation. Among various components, the runner is most severely worn, and energy dissipation dominates.

Keywords: Hydro turbine; Sediment erosion; Sand containing cavitation; Modified multiphase model; Energy dissipation (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:294:y:2024:i:c:s0360544224005668

DOI: 10.1016/j.energy.2024.130794

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