水力机械泥沙磨损的数值模拟

Numerical Simulation of Silt Abrasive Erosion in Hydraulic Machinery

作者对低浓度沙水 (平均固体容积浓度Cv<1%,或含沙量低于 2 0kg/m3 )中运行的水力机械的泥沙磨损进行了数值模拟研究。利用Eulerian -lagrangian混合湍流模型 (这个模型是基于两相中的颗粒源项数值技术 ,即液相采用Eulerian描述 ,而颗粒相采用Lagrangian描述 )对水力机械中湍流速度、压力分布以及颗粒轨迹进行了数值计算。同时给出了水力机械中的颗粒反弹模型和磨损模型。通过对一水轮机导叶磨损率的计算 。

Numerical investigation into silt abrasive erosion of hydraulic machinery for low sand water concentration(mean sand concentration by volume C v<1%,or sand carrying capacity less than 20 kg/m 3)is reported The turbulent flow velocity fields and pressure distributions as well as the trajectories of sand particles in hydraulic machinery flow are numerically calculated using the mixed Eulerian Lagrangian turbulence model This turbulence model is based on the particel 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 machinery flow field are also presented We calculated the erosion wear rates of a hydraulic turbine guide vane The numerical predictions show good agreement with the actual