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논문 기본 정보

저자정보
(과학기술연합대학원대학교) (과학기술연합대학원대학교) (한국수자원공사) (한국수자원공사) (과학기술연합대학원대학교)
저널정보
한국유체기계학회 한국유체기계학회 논문집 한국유체기계학회 논문집 제22권 제2호(통권 제113호)
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    초록·키워드

    In this study, a numerical analysis of the inter-blade vortex characteristics of a Francis hydro turbine model was performed with various flow rate conditions in the operating range. The model turbine demonstrated notably different internal flow characteristics for different operating conditions. Particularly, an inter-blade vortex between the runner blade passages was observed at lower flow rate conditions. An inter-blade vortex can cause reduction in performance, and vibration and instability in the operation of a turbine system. Therefore, understanding inter-blade vortex characteristics is important for the safe and stable operation of turbines. To investigate internal flow and unsteady pressure characteristics, three-dimensional steady and unsteady Reynolds-averaged Navier-Stokes calculations using a shear stress transport turbulence model were performed with two-phase flow analysis. Inter-blade vortices were captured at the leading and trailing edges of the near runner hub between blade passages. This vortex region exhibited flow separation and lower velocity and contributed to decreased hydraulic performance and higher unsteady pressure characteristics.

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      UCI(KEPA) : I410-ECN-0101-2019-554-000684960