基于CFD-DEM耦合模拟的侧喷吹管道减磨弯头流动特性分析
Study on the flow characteristics of wear-resistant elbow in side injection pipeline by CFD-DEM coupled simulation
胡伟波 1苏利威 2周甲伟 2杨军 1纪云 3吴晓松4
作者信息
- 1. 河南瑞德克气力输送设备有限公司,河南 新乡 453400
- 2. 华北水利水电大学,河南 郑州 450045
- 3. 燕山大学,河北 秦皇岛 066004
- 4. 长沙有色冶金设计研究院有限公司,湖南 长沙 410019
- 折叠
摘要
为实现煤粉颗粒在管道和喷枪内的稳定可靠输送和精确喷吹,以气固两相物料在弯头内的流动特性为对象,采用计算流体力学与离散元耦合(CFD-DEM)方法对普通弯头、T型弯头、堵塞型弯头、球型弯头内颗粒运动情况进行分析,研究发现:颗粒流经三种减磨弯头时速度会出现显著的下降,同时还会引起显著气流速度和压强的波动,上述现象以T型弯头最为显著;减磨弯头通过颗粒床中颗粒-颗粒碰撞减小颗粒对管壁的冲击,三种减磨弯头中颗粒-颗粒碰撞次数与碰撞法向力均较高,可能引发喷吹物料流动的紊乱.
Abstract
The flow characteristics of gas-solid two-phase flow in elbows are numerical simulated by computational fluid dynamics and discrete element coupling method(CFD-DEM).The aforementioned flow characteristics are important factors to ensure stable and reliable transportation of side injection for coal powder particles in nonferrous metal smelting.The ordinary elbows,the T-shaped elbows,the blind elbows,and spherical elbows are selected to discuss.The results show that there is significant velocity decrease in the three wear-resistant elbows.Meanwhile,significant fluctuations in airflow velocity and pressure are also found in the wear-resistant elbows,which is most significant in the T-shaped elbows.It is also found that the wear-resistant elbow can reduces the wall erosion by particle-particle collisions rather than particle-wall collisions.The number of particle to particle collisions and the contact normal force are relatively high in the three types of wear-resistant elbow,which is a potential factor to flow turbulence in sprayed processing.
关键词
侧喷吹/减磨弯头/流动特性/CFD-DEM/气固两相流Key words
Side injection/wear-resistant elbows/flow characteristics/CFD-DEM/gas-solid two phase flow引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据