空间组合弯头气固两相流动磨损特性的数值模拟  

Numerical Simulation on Erosion Characteristics of Space Elbows for Gas-Solid Flow

作　　者：王宇[1] 刘荣堂 刘明[1] 严俊杰[1] WANG Yu;LIU Rongtang;LIU Ming;YAN Junjie(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《动力工程学报》2022年第2期144-149,共6页Journal of Chinese Society of Power Engineering

基　　金：联合基金项目-企业-陕煤联合基金资助项目(2021JLM-35)。

摘　　要：采用计算流体力学(CFD)方法对空间组合弯头内气固两相流动及磨损特性进行了数值模拟,研究了气流速度、颗粒直径、颗粒浓度和弯头间连接长度对壁面磨损率的影响。结果表明:空间组合弯头壁面磨损最严重位置在第1个弯头外侧,磨损严重区域自中心向周围过渡;气流发生空间转向,固体颗粒由于惯性会撞击在第2个弯头的侧壁面,导致第2个弯头壁面磨损率呈不对称分布,靠近管道入口的一侧,壁面磨损较小;空间组合弯头最大磨损率随气流速度的增大呈指数提高,随着颗粒浓度的增大而线性增大;随颗粒斯托克斯数St的增大,第1个弯头的最大磨损率先提高后变化趋于平缓,第2个弯头的最大磨损率先提高后降低。The gas-solid two-phase flow and erosion characteristics in space elbows were numerically simulated by computational fluid dynamics(CFD),so as to study the effects of gas velocity,particle diameter,particle concentration and connection length between elbows on wall erosion rate.Results show that the most serious erosion position on the wall of the space elbow is on the outside of the first elbow,and erosion distribution presents a falloff to surrounding zone.The gas flow direction changes and solid particles would collide the side wall of the second elbow due to the inertia,resulting in the asymmetric distribution of wall erosion rate of the second elbow,as well as less wear on the side close to the pipe inlet.The maximum erosion rate of the space elbow increases exponentially with the rise of gas velocity,while increases linearly with the rise of particle concentration.With the rise of St of particles,the maximum erosion rate of the first elbow increases first and then tends to be flat,and that of the second elbow increases first and then decreases.

关 键 词：空间组合弯头 磨损率 气固两相流 颗粒分布 

分 类 号：TB126[理学—工程力学]