Due to its structural characteristics, the Kaplan turbine has a specific tip clearance between blade and chamber of the runner. This paper simulates effect of varied runner tip clearance on hydraulic performance of Kaplan turbine by CFD, and model tests validated the results. The results show that the efficiency and cavitation level of turbine will decrease with the increase of runner tip clearance within a specific range.
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Shui et al. (2024) studied this question.
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