The influence of guide vane opening on the internal flow of a francis turbine
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The variable demand on the energy market requires a great flexibility in operating hydro turbines. However, Francis turbine operated at off-design conditions poses technical challenges related to large unsteady forces given by residual swirl and angular momentum. In order to improve the performance of a Francis turbine,the paper presents a numerical investigation of the 3D flow in the turbine at off-design conditions and discusses the influence of variable guide vane openings on the internal flow of a Francis turbine with the help of computational fluid dynamics. First, the internal flow characteristics of Francis turbine operated by varied guide vane angle at off design condition are computed and the optimal guide vane angle is obtained. Secondly, the Francis turbine is operated with guide vane number varies at the optimal guide vane angle. Finally, pressure contours and velocity distributions in the distributor are discussed and compared.
Abstract
The variable demand on the energy market requires a great flexibility in operating hydro turbines. However, Francis turbine operated at off-design conditions poses technical challenges related to large unsteady forces given by residual swirl and angular momentum. In order to improve the performance of a Francis turbine,the paper presents a numerical investigation of the 3D flow in the turbine at off-design conditions and discusses the influence of variable guide vane openings on the internal flow of a Francis turbine with the help of computational fluid dynamics. First, the internal flow characteristics of Francis turbine operated by varied guide vane angle at off design condition are computed and the optimal guide vane angle is obtained. Secondly, the Francis turbine is operated with guide vane number varies at the optimal guide vane angle. Finally, pressure contours and velocity distributions in the distributor are discussed and compared.
참고문헌 (7)
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- R. Khare, "CFD approach for flow characteristics of hydraulics Francis turbine", International Journal of Engineering Science and Technology, 2(8), pp.3824~3831 (2010)
- S. Muntean, "Analysis of the GAMM Francis turThe bine distributor 3D flow for the whole operating range and optimization of the guide vane axis location", Proceedings of the 6th International Conference on Hydraulic Machinery and Hydrodynamics, pp.131~136 (2004)
- S. Muntean, "Numerical analysis of the flow in the old Francis runner in order to define the refurbishment strategy", University Politehnica of Bucharest Scientific Bulletin, Series D, 72(1), pp.117~124 (2010)
- A. Alnaga, "Optimal design of hydraulic turbine distributor", World Scientific and Engineering Academy and Society Transactions on Fluid Mechanics, 3(2), pp.175~185 (2008)
- "ANSYS CFX Documentation"[URL]
- Tanaka Suiryoku, "Technical Design Book of Francis Hydro Turbine" (2012)