轴流泵固液两相数值模拟及磨损特性研究

Research on numerical simulation and wear characteristics of solid-liquid two-phase of axial-flow pump

为研究轴流泵输送含沙水时过流部件的磨损情况,基于ANSYS CFX软件,应用非均相流模型和粒子模型,对轴流泵内固液两相流场进行数值模拟.重点分析了过流部件壁面处固相体积分数分布、固相滑移速度、体积分数分布及滑移速度与过流部件磨损的关系.结果表明:固相颗粒主要集中于叶片头部和叶片工作面,导致了叶片工作面磨损速度大于背面,并以进口头部的磨损破坏最为显著;固相滑移速度方向的不同,造成了叶片头部和叶片表面磨损类型的不同;固相滑移速度大的地方,固相体积分数较大,过流部件的磨损较为严重;在相同固相体积分数下,叶片工作面固相滑移速度大于背面;在叶片表面的同一部位,固相滑移速度均随着固相体积分数和颗粒直径的增大而增大,大颗粒对过流部件的磨损更为严重.

To study the wear characteristics of hydraulic components of an axial‐flow pump transpor‐ting silt carrying flow ,the inner solid‐liquid two‐phase flow field was simulated by utilizing the inho‐mogeneous model and the particle model based on software ANSYS CFX .The focus was placed on the analysis of the solid phase volume fraction distribution and slip velocity on the hydraulic components wall ,and their relations with the wear characteristics .Results show that the solid particles are mainly accumulated near the head and the pressure surface of blades ,so the pressure surface wears faster than the suction side and the most serious wear damage appears on the head of inlet .Different direc‐tional solid phase slips cause different types of wear on blade head and blade surface .Where the solid phase slipping faster ,the volume fraction is larger ,the wear of hydraulic components is more serious . Under the same solid phase volume fraction ,the slip velocity of the pressure surface is higher than that of the suction side .In the same position of the blade surface ,solid phase slip velocity is increas‐ing with the increase of solid phase volume fraction and particle diameter ,and the wear of hydraulic components become more serious when transporting flows with large particles .