固体颗粒粒径对输送泵叶轮磨损特性的影响

Influence of Solid Particle Size on Wear Behavior of the Impeller of Delivery Pump

采用计算流体动力学与离散元耦合的方法,建立数值模型,对输送泵内固液两相流进行数值模拟。应用欧拉-拉格朗日模型和Archard磨损模型,考虑固液两相之间的相互作用,探究颗粒粒径对输送泵叶轮磨损的影响规律及作用机制。结果表明,叶片是输送叶轮中磨损较为严重的部件,磨损集中在长叶片工作面出口和叶片进口位置;随着颗粒粒径增大,叶片进口的磨损不断加重,而叶片工作面的磨损量下降,颗粒撞击叶轮工作面的几率减小,颗粒易冲击短叶片。

A numerical model was established by adopting coupling computational fluid dynamics and discrete element method,and then was used to perform a numerical simulation for the solid-liquid two-phase flow in the delivery pump.In consideration of the interaction between the solid and liquid phases,the influence of solid particle size on the wear and failure of the impeller in the pump and the underlying mechanisms were explored by adopting the Euler-Lagrange model and Archard wear model.The results show that the blades undergo the most severe wear among the components of the impeller,with the wear concentrated at the outlet of the working surface of the long blade and the blade inlet.As the solid particle size increases,the wear in the blade inlet becomes increasingly severe while the blade working surface presents an opposite wear tendency.Meanwhile,there′s less probability for the solid particles to impact against the working surface of the impeller,but they tend to impact the short blades.