水力发电学报2024，Vol.43Issue(7)：51-60,10.DOI:10.11660/slfdxb.20240705
泥沙浓度对水力机械材料磨损及磨蚀特性的影响
Influence of sediment concentration on abrasion and erosion characteristics of hydraulic machinery materials
摘要
Abstract
Hydraulic machineries running on muddy rivers suffer from sediment erosion that often causes deformation and damage to flow components,seriously threatening the safe operation of hydropower plants.This study conducts an experiment on a rotating jet facility to examine the influence of sediment concentration on the impact abrasion and erosion characteristics of hydraulic machinery materials,using the weight loss method and Scanning Electron Miscroscopy(SEM).The results show the cumulative weight loss of materials from impact abrasion and erosion takes a nearly linear increase with the rise of sediment concentration.With sediment concentration lower than 60 kg/m3,the increase in the cumulative weight loss of the tested three material is gradual;it becomes rapid at higher concentration.As the concentration increases,the impact erosion causes more severe damage to the materials,but cavitation erosion shows a weakening trend.The higher the surface hardness of the material,the better its resistance to cavitation erosion,and the lower the critical sediment concentration at which the weights of abrasion and erosion are equal. Flow cavitation affects the angle at which sand particles impact on the material surface,and it usually increases the horizontal impact load of the particles. The abrasion marks show lip edges and material accumulation,and the sand particle cutting damage dominates at higher sediment concentrations.关键词
泥沙磨损/磨蚀/水力机械材料/旋转喷射装置Key words
sand abrasion/erosion/hydraulic machinery materials/rotating jet facility分类
金属材料引用本文复制引用
杨俊峰,孙淑贞,孙帅辉,宋国华,任最有..泥沙浓度对水力机械材料磨损及磨蚀特性的影响[J].水力发电学报,2024,43(7):51-60,10.基金项目
陕西省水利科技计划项目(2023slkj-3) （2023slkj-3）
