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Numerical investigations on silt abrasive erosion of hydraulic turbine for low sand concentration (with mean sand concentration by volume Cv<1%, or sand carrying capacity less than 20kg/m3) are reported. The turbulent flow velocity fields and pressure distributions as well as the trajectories of sand particles in hydraulic turbine flow are numerically calculated by the mixed Eulerian-Lagrangian turbulence model. This turbulence model is based on the particle-source-in-cell numerical technique for two-phase flows, and, Eulerian equations are used for the description of the liquid phase dynamics,whilst the solid particles are treated within the Lagrangian framework. The sand particle rebound model and the erosion wear model in hydraulic turbine flow field are also presented. We calculated the erosion wear rates of Gezhouba hydraulic turbine guide vane. The numerical predictions show good agreement with the tests.
Numerical investigations on silt abrasive erosion of hydraulic turbine for low sand concentration (with mean sand concentration by volume Cv <1%, or sand carrying capacity less than 20kg / m3) are reported. The turbulent flow velocity fields and pressure distributions as well as the trajectories of sand particles in hydraulic turbine flow are numerically calculated by the mixed Eulerian-Lagrangian turbulence model. This turbulence model is based on the particle-source-in-cell numerical technique for two-phase flows, and, Eulerian equations are used for the description of the liquid phase dynamics, whilst the solid particles are treated within the Lagrangian framework. The sand particle rebound model and the erosion wear model in hydraulic turbine flow field are also presented. We calculated the erosion wear rates of Gezhouba hydraulic turbine guide vane. The numerical predictions show good agreement with the tests.