Abstract
Abstract Francis turbine is adopted in many hydropower stations widely. Usually, the operating environment is sandy water flow, and the unit will suffer from sediment wear, affecting the operating life of the unit. This article focuses on the wear problem of hydraulic turbines and uses numerical simulation to conduct research on sediment wear. Lagrange model is adopted to predict the sediment concentration in the flowpassageof the unit, and Tabakoff model is used as the wear model. The results indicate that the guide vane blades, seat rings, end clearance, and runner blades and lower rings of hydraulic turbines are prone to sediment erosion. According to friction mechanics, these areas are mainly subjected to impact wear caused by particle impact at the inlet of the guide vane and the runner. The wear on the surface of the blade passage is mainly caused by frictional wear caused by particle sliding motion. The research results provide a certain help for the optimization of hydraulic turbine wear resistance in engineering.
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