Numerical simulation of two-phase turbulent flow in Francis turbine passage on sediment erosion
HUANG Jianfeng1, ZHANG Lixiang2, YAO Ji2, LONG Liyan1
1.Faculty of Water Conservation, Yunnan Agricultural University, Kunming, Yunnan 650201, China; 2.Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
This study aims to investigate the flow behavior of solid-liquid two-phase flow based on sediment erosion in Francis turbine, the numerical simulation of three-dimensional two-phase turbulent flow in the Francis turbine passage was conducted by the mixture model for an algebraic slip formulation in the Euler—Euler approach based on the CMFD theory, the polyhedron mesh technique, standard k-ε model, SIMPLEC algorithm and multiple reference frame model. The silt volume fraction distributions in guide vanes and blade passage were obtained in the small opening case by the ANSYS Fluent software. The position and degree of sediment erosion in the Francis turbine passage were analyzed. The simulation results coincided with the distribution of sediment particles on the blade runner practical wear. The results show that this method can be used to simulate the 3D turbulent flow and true multiphase flow with sediment erosion in Francis turbine,which provides a significant reference for revealing the influence mechanism of the sediment particles interacting with water in the solid-liquid two-phase turbulent flow field that can induce turbine vibration and solving practical engineering problems.
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