脱硫泵固液两相流动的数值模拟与磨损特性  

Numerical simulation of solid-Liquid two-phase flow and abrasion characteristics in desulfurization pump

作　　者：李昳[1] 何伟强[1] 朱祖超[1] 张玉良[2] 崔宝玲[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,浙江杭州310018 [2]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《排灌机械》2009年第2期124-128,共5页Drainage and Irrigation Machinery

基　　金：国家自然科学基金资助项目(50609025、50879080);浙江省科技计划项目(2008C21023、2008C01024-1)

摘　　要：采用k-ε-Ap模型模拟了脱硫泵内固液两相流动,并对3种直径的颗粒浓度分布、速度分布及磨损特性进行了研究.结果表明,不同直径的固体颗粒在叶片压力面上的体积浓度均比吸力面上高,其浓度随颗粒直径增加而增加;在蜗壳中,颗粒主要分布在蜗壳近壁处,并随颗粒直径增大而浓度增加.其相对速度矢量方向基本沿叶片表面,与叶片相切,因此在叶片上主要发生滑动磨损;固体颗粒以较小角度与蜗壳壁面相碰撞,随颗粒直径增大,角度略有增加,在离心力的作用下,固体颗粒以较大径向速度挤压蜗壳壁面,并沿蜗壳周壁向出口运动,导致蜗壳发生严重滑动磨损;颗粒在蜗壳隔舌附近的运动比较紊乱,导致在隔舌部位主要发生冲击磨损.数值模拟结果与实际磨损情况比较吻合,表明所采用的计算方法是可行的.Particle concentration distribution, velocity distribution and abrasion characteristics were studied by using numerical simulation of the solid-liquid two-phase flow in a desulfurization pump. The volume fraction of solid particles along the blade pressure sides is higher than the suction sides and increases when the particle diameter increases. Particles in the volute are mainly distributed near the wall. The volume fraction increases with the increase of particle diameter. The relative-velocity vector direction is basically along the blade surface. This indicates that it＇s the sliding wear in the blades. Particles collide with the volute wall with a small angle. The angle increases with the increase of the particle diameter. Solid particles move to the volute outlet along walls while they extrude the walls by the effect of centrifugal force. So serious abrasion appears in the volute. The particles moving track is disorder near the position of volute tongue. The impact wear occurs near the tongue region. Numerical simulation results are consistent with the actual situation. It follows that the calculating method is feasible.

关 键 词：脱硫泵 固液两相流 数值模拟 磨损 特性 

分 类 号：TH311[机械工程—机械制造及自动化]