Quantitative prediction and evaluation method for sediment-laden cavitation erosion risk of hydraulic turbine

Abstract

Disclosed in the present invention is a quantitative prediction and evaluation method for sediment-laden cavitation erosion risk of a hydraulic turbine, which relates to the technical field of erosion resistance of hydraulic machinery. The present invention establishes a comprehensive mathematical model capable of quantifying a coupling effect of cavitation erosion and abrasion, and implements the model based on a discrete element method (DEM)-computational fluid dynamics (CFD) coupled simulation framework, mainly including three stages: model construction and parameter calibration, simulation environment configuration, and coupling computations and risk quantification. The present invention solves the problem in the prior art that it is difficult to accurately quantify the complex erosion risk of flow-passing components of a hydraulic turbine in sediment-laden cavitating flow, which is caused by combined action of bubble collapse and solid particle impact.