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  • Title(Kor)
    프란시스 수차 모델의 러너 간극에 따른 내부유동 및 성능 특성
  • Title(Eng)
    Internal Flow and Performance Characteristics According to the Runner Gap of a Francis Turbine Model
  • Keyword
    프란시스 수차(Francis turbine), 러너 간극(Runner gap), 누설 유동(Leakage flow), 수치해석(Numerical analysis)
  • Author(Kor)
    김승준1,2⋅최영석1,2⋅조 용3⋅최종웅3⋅현정재3,4⋅주원구4⋅김진혁1,2†
  • Author(Eng)
    SEUNG-JUN KIM1,2, YOUNG-SEOK CHOI1,2, YONG CHO3, JONG-WOONG CHOI3, JUNG-JAE HYUN3,4, WON-GU JOO4, JIN-HYUK KIM1,2†
  • Date
    2020-06
  • Attach file
  • Page
    Page. 323~336
  • Abstract(Eng)
  • 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.