固体颗粒对水力旋流器冲蚀磨损特性的影响

Effect of Solid Particles on the Erosion Wear Characteristics of Hydrocyclone

针对工业污水处理系统中水力旋流器壁面的冲蚀磨损问题,采用FLUENT软件中RSM模型和DPM模型模拟水力旋流器内液、固两相流的流动情况,并以Grant和Tabakoff碰撞模型求解器壁冲蚀磨损速率。研究了不同颗粒流速、粒径和质量流量条件下器壁冲蚀磨损规律以及最大冲蚀磨损位置。结果表明:旋流器壁面最大冲蚀磨损率随着颗粒流速的增大而呈指数递增,与质量流量呈正相关关系,但与颗粒粒径呈不完全线性增长关系;旋流器壁面冲蚀磨损率随着颗粒流速、粒径和质量流量的改变而不同,其中颗粒流速变化的影响最大、质量流量次之、粒径的影响最小;固体颗粒碰撞和磨削旋流器壁面而引起局部磨损,并且影响最大冲蚀磨损区域的出现位置。

With respect to the erosion wear problem of hydrocyclone wall in the industrial sewage treatment system,the liquid- solid two-phase flow inside the hydrocyclone was simulated using Reynolds stress model and discrete phase model in the CFD software Fluent,and the erosion wear rate of the hydrocyclone wall was calculated using the Grant and Tabakoff collision model. The erosion wear rules and the maximum erosion wear location of the hydrocyclone wall were studied under the conditions of different particle velocity,particle size and mass flow rate. The results show that the maximum erosion wear rate of hydrocyclone wall increases exponentially with the increase of particle velocity,and is positively correlated with mass flow rate,but it presents a relation of incomplete linear increase with the increase of particle size. The erosion wear rate of the hydrocyclone wall varies with the varying particle velocity,particle size and mass flow rate,among them the effect of particle velocity is biggest,the mass flow rate next,and the effect of particle size is smallest. Collision and ablation of solid particles on hydrocyclone wall cause local erosion on hydrocyclone wall and influence the occurring location of the maximum erosion wear area.