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http://dx.doi.org/10.7316/KHNES.2020.31.3.328

Internal Flow and Performance Characteristics According to the Runner Gap of a Francis Turbine Model  

KIM, SEUNG-JUN (Industrial Technology (Green Process and Energy System Engineering), Korea University of Science & Technology)
CHOI, YOUNG-SEOK (Industrial Technology (Green Process and Energy System Engineering), Korea University of Science & Technology)
CHO, YONG (K-water Convergence Institute, Korea Water Resources Corporation)
CHOI, JONG-WOONG (K-water Convergence Institute, Korea Water Resources Corporation)
HYUN, JUNG-JAE (K-water Convergence Institute, Korea Water Resources Corporation)
JOO, WON-GU (Department of Mechanical Engineering, Yonsei University)
KIM, JIN-HYUK (Industrial Technology (Green Process and Energy System Engineering), Korea University of Science & Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.31, no.3, 2020 , pp. 328-336 More about this Journal
Abstract
In the Francis turbine, the leakage flow through the runner gaps which are between the runner and the stator structure influences the internal flow and hydraulic performance. Thus, the investigation for the flow characteristics induced by the runner gaps is important. However, the runner gaps are often disregarded by considering the time and cost of the numerical analysis. Therefore, in this study, the flow characteristics according to runner gaps of the Francis turbine model were investigated including the leakage flow of the runner cone. The three-dimensional unsteady Reynolds-averaged Navier-Stokes analyses were conducted using a scale-adaptive simulation shear stress transport as a turbulence model for observing the influence of the leakage flow on the internal flow and hydraulic performance. The efficiencies were decreased slightly with runner gaps; and the complicated flows were captured in the gaps.
Keywords
Francis turbine; Runner gap; Leakage flow; Numerical analysis;
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