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Asymmetric sediment erosion characteristics analysis of Pelton Turbine buckets based on the Euler-Lagrange method
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Asymmetric sediment erosion characteristics analysis of Pelton Turbine buckets based on the Euler-Lagrange method
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Journal Article
Asymmetric sediment erosion characteristics analysis of Pelton Turbine buckets based on the Euler-Lagrange method
2025
Overview
Pelton turbines often operate in sediment-rich rivers，where buckets are subjected to prolonged impacts from high-velocity jets. The sediment-laden flow on the bucket surfaces exhibits complex multiphase interactions, transient behavior, and strongly erosive characteristics. To elucidate the formation mechanism of asymmetric erosion on the bucket surfaces and establish a correlation between water film structures and bucket erosion rates, a numerical study of gas-liquid-solid three-phase flow in Pelton turbines was conducted using the Euler-Lagrange method. The erosion intensity on the bucket surfaces, under typical sediment particle sizes (0.005 mm, 0.01 mm, and 0.05 mm) is quantitatively analyzed. The results indicate vortex structures within the water supply mechanism induce jet deformation, leading to deviations in both the incidence angle and energy distribution of the jet on the bucket surface, which in turn results in significant asymmetry in the erosion distribution. As the sediment particle diameter increases, the degree of erosion asymmetry intensifies, with coarse particles forming concentrated, high-intensity erosion zones on both sides of the splitter, while fine particles primarily cause lower-intensity erosion near the bucket’s outlet edge. Additionally, under the influence of asymmetric jet flow, the erosion intensity is generally higher on the left surface of the working surface and at the leading edge of the splitter. These findings provide theoretical guidance for the erosion-resistant design optimization of Pelton turbines, the deployment of protective coatings, and the formulation of operation and maintenance strategies.
Publisher
IOP Publishing
Subject
