风流速度与喷雾角度对雾滴场分布特征的影响  

The influence of airflow velocity and spray angle on distribution characteristics of droplet field

作　　者：莫金明 MO Jinming(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤矿安全》2024年第8期62-71,共10页Safety in Coal Mines

基　　金：重庆市自然科学基金面上资助项目(cstc2021jcyj-msxmX1153)。

摘　　要：雾滴分布特征是决定喷雾系统降尘效果的关键因素之一。为研究不同工况下雾滴分布特征,利用CFD模拟技术分析了风速及喷雾角度对雾滴分布特征的影响机制;并探究了采煤机附近布置喷雾喷嘴后的雾滴分布特征。研究结果表明:不同风速和喷雾角度主要是通过增大雾滴的横向动量,造成喷雾带纵向高度和横向长度的增加;风速的增大,造成不同空间位置的雾滴间动量屏蔽效应更加突出,进一步增大了雾滴间所受横向动量的差异,增强了雾滴间集聚效应,使喷雾带周围形成大粒径雾滴层;喷雾角度的增大主要改变了出口动量在横向和纵向2个方向的分配比例,空间内所有雾滴所受动量更为均匀,进而对喷雾粒径分布特征无明显影响。Droplet distribution characteristic is one of the key factors to determine the dust reduction effect of the spray system.In order to study the droplets distribution characteristics under different conditions,the effect mechanism of airflow speed and spray angle on the droplets distribution characteristics was analyzed based on CFD simulation;in addition,the characteristics of droplet distribution after the spray nozzles are arranged near the shearer are also investigated.The results indicate that different airflow speed and spray angle conditions caused an increase in the longitudinal height and transverse length of the spray belt mainly by increasing the transverse momentum of the droplets.With the increase of wind speed,the momentum shielding effect between droplets at different spatial locations becomes more prominent,which further increases the difference of transverse momentum between droplets and enhances the convergence effect between droplets,resulting in the formation of large-particle droplets around the spray zone.The increase of the spray angle mainly changes the distribution ratio of the outlet momentum in the transverse and longitudinal directions,and the momentum of all droplets in the space is more uniform,which has no obvious effect on the spray particle size distribution characteristics.

关 键 词：煤矿粉尘 喷雾降尘 粒径分布 风流扰动 雾滴分布 

分 类 号：TD711[矿业工程—矿井通风与安全]