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Article

Prediction of the Cavitation over a Twisted Hydrofoil Considering the Nuclei Fraction Sensitivity at 4000 m Altitude Level

by 1 and 2,3,*
1
School of Water Resources and Civil Engineering, Tibet Agriculture & Animal Husbandry University, Linzhi 860000, China
2
College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
3
Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Michele La Rocca
Water 2021, 13(14), 1938; https://doi.org/10.3390/w13141938
Received: 9 June 2021 / Revised: 11 July 2021 / Accepted: 11 July 2021 / Published: 13 July 2021
(This article belongs to the Section Hydraulics and Hydrodynamics)
Cavitation phenomenon is important in hydraulic turbomachineries. With the construction of pumping stations and hydro power stations on plateau, the influence of nuclei fraction on cavitation becomes important. As a simplified model, a twisted hydrofoil was used in this study to understand the cavitation behaviors on pump impeller blade and turbine runner blade at different altitude levels. The altitudes of 0 m, 1000 m, 2000 m, 3000 m and 4000 m were comparatively studied for simulating the plateau situation. Results show that the cavitation volume proportion fcav increases with the decreasing of cavitation coefficient Cσ. At a specific Cσ, high altitude and few nuclei will cause smaller size of cavitation. The smaller Cσ is, the higher the sensitivity Δfcav is. The larger Cσ is, the higher the relative sensitivity Δfcav* is. On the twisted foil, flow incidence angle increases from the sidewall to mid-span with the decreasing of the local minimum pressure. When Cσ is continually decreasing, the size of cavitation extends in spanwise, streamwise and thickness directions. The cavity is broken by the backward-jet flow when Cσ becomes small. A tail generates and the cavity becomes relatively unstable. This study will provide reference for evaluating the cavitation status of the water pumps and hydroturbines installed on a plateau with high altitude level. View Full-Text
Keywords: cavitation; detaches eddy simulation; twisted hydrofoil; pressure distribution; high altitude cavitation; detaches eddy simulation; twisted hydrofoil; pressure distribution; high altitude
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MDPI and ACS Style

Luo, H.; Tao, R. Prediction of the Cavitation over a Twisted Hydrofoil Considering the Nuclei Fraction Sensitivity at 4000 m Altitude Level. Water 2021, 13, 1938. https://doi.org/10.3390/w13141938

AMA Style

Luo H, Tao R. Prediction of the Cavitation over a Twisted Hydrofoil Considering the Nuclei Fraction Sensitivity at 4000 m Altitude Level. Water. 2021; 13(14):1938. https://doi.org/10.3390/w13141938

Chicago/Turabian Style

Luo, Hongying, and Ran Tao. 2021. "Prediction of the Cavitation over a Twisted Hydrofoil Considering the Nuclei Fraction Sensitivity at 4000 m Altitude Level" Water 13, no. 14: 1938. https://doi.org/10.3390/w13141938

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