基于CFD-DEM的气力输送变径管中颗粒流动特性分析  

Flow Characteristics Analysis of Particles in Pneumatic Conveying with Tapered Pipeline Based on CFD⁃DEM

作　　者：侯艳君 王庆辉 周甲伟 闫翔宇 郑泽冰 刘晓辉 HOU Yanjun;WANG Qinghui;ZHOU Jiawei;YAN Xiangyu;ZHENG Zebing;LIU Xiaohui(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan,China;Chang′an University,Xi′an 710064,Shanxi,China)

机构地区：[1]华北水利水电大学机械学院,河南郑州450045 [2]长安大学,陕西西安710064

出　　处：《矿冶工程》2023年第6期6-10,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(52275110,51805166)。

摘　　要：为明确气力输送中变径管几何参数对管道中颗粒流动特性的影响规律,采用CFD-DEM耦合方法对5种不同变径比和变径长度的水平变径管进行了数值模拟,探讨了变径比、变径长度等几何参数对变径管中颗粒速度、压力损失以及弗劳德数的影响规律。结果表明,变径管可以降低颗粒速度,且随着变径长度和变径比增大,变径管中颗粒速度均呈现先增大后减小的趋势;变径管可以降低管道压降,增大变径比和变径长度,管道中压力损失增大;变径比越大,变径后管道中弗劳德数越小;变径长度越长,弗劳德数下降越慢。In order to clarify the influence of geometric parameters of tapered pipeline on particle flow characteristics in pneumatic conveying,numerical simulation was conducted for horizontal pipelines with 5 kinds of taper ratio and taper length by adopting CFD-DEM coupling method.Influence of geometric parameters of taper ratio and taper length on particle velocity,pressure loss and Froude number in tapered pipeline was investigated.The results show that tapered pipe can reduce particle velocity.As taper length and taper ratio increase,particle velocity increases first and then decreases.And the tapered pipe can also reduce pressure drop in pipeline.As taper ratio and taper length increase,pressure loss in pipeline increases.The higher the taper ratio,the smaller the Froude number in tapered pipe is.As taper length increases,the Froude number decreases more slowly.

关 键 词：管道输送 气力输送 气力充填 水平变径管 气固两相流 流动特性 CFD-DEM 变径比 变径长度 

分 类 号：TH232[机械工程—机械制造及自动化]