CHEN Wei,ZHANG Pei,SUN Yongchang,WU Yukun,ZHENG Chenglin,XU Zhiheng,LI Zhengquan

(Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, Jiangxi University of Science &Technology,Ganzhou 341000,China)

Abstract:Using the method of coupling computational fluid dynamics (CFD) and discrete element method (DEM),on the basis of model verification and grid-independent verification,the wear of 90° elbow when hydraulically conveying non-spherical granular materials was studied.The internal mechanism of pipeline wear was studied through the results of motion trajectory,flow state,and solid volume distribution during the transportation of particles with three different length-to-diameter ratios.The results show that under the same conditions,the larger the particle aspect ratio is,the larger the wear area and the more serious the wear.The wear rate at the elbow increases with the increasing of the central angle.The increasing trend of the wear rate in the range of 70°～90° is more obvious,and reaches the maximum value at 90°.When the particle sphericity is different,the maximum wear rate of the three-sphere combined particle is about 2.4 times that of the single-sphere particle,and the wear at the outer arch of the elbow is more serious than that at the inner arch.When the aspect ratio of particles changes,particles with large aspect ratios are more likely to gather at the top of the pipe when they leave the elbow,resulting in increased elbow wear and increased wear area.

Keywords:computational fluid dynamics;discrete element method;elbow;hydraulic transport;non-spherical particle;wear

中图分类号：TE832                              文献标志码：A

文章编号：1008-5548(2022)05-0082-10

DOI:10.13732/j.issn.1008-5548.2022.05.011

收稿日期： 2022-04-15， 修回日期：2022-06-28,在线出版时间：2022-08-09 14:00。

基金项目：国家自然科学基金项目，编号：52130001；江西理工大学高层次人才科研启动项目，编号：JXXJBS17078。

第一作者简介：陈伟(1996—)，男，硕士研究生，研究方向为水力输送模拟技术。E-mail：1159307457@qq.com。

通信作者简介：李政权(1982—)，男，副教授，博士，硕士生导师，研究方向为多相流仿真模拟。E-mail：qqzhengquan@163.com。