摘要
为加强喷嘴在高强度粉尘的煤矿井下的雾化性能,得到最优的结构设计和理想的雾滴粒径,本文首先依据公式得出一组拉瓦尔喷嘴的最优几何结构,探究了喉管直径、扩张角及气—液体积等物理参数对拉瓦尔式结构喷嘴雾化性能的影响规律。在气—液两相流下,运用Fluent软件对喷嘴内流场进行数值模拟,得到了喷嘴内流场的速度云图。发现喉管直径对拉瓦尔喷嘴出口速度有很大的影响;不同的扩张段半锥角对结果也有不同程度的影响;液体压力的变化对雾滴粒径的影响十分明显。喷嘴内部气—液体积比为6∶4并且气—液压力比为3∶1时,除尘效果最好。
In order to enhance the atomization performance of nozzles in high-intensity dusty coal mines and obtain the optimum structure design and the ideal droplet size,the optimum geometrical structure of a group of Laval nozzles is obtained based on formula,and the effect law of the physical parameters such as throat diameter,expansion angle and gas-liquid volume on the atomization performance Laval nozzles are explored.In the gas-liquid two-phase flow,the flow field in the nozzle was simulated by using Fluent,and the velocity contour of the flow field in the nozzle was obtained.It is concluded that the throat diameter has a great influence on the exit velocity of Laval nozzle;different expansion half angles have different effects on the results;the change of liquid pressure has a significant effect on the droplet size.The best dust removal effect is obtained when the gas-liquid volume ratio is 6:4 and the gas-hydraulic pressure ratio is 3:1.
作者
赵向锋
陈绍杰
ZHAO Xiangfeng;CHEN Shaojie(North China Institute of Science and Technology,Yanjiao,065201,China)
出处
《华北科技学院学报》
2019年第5期6-10,44,共6页
Journal of North China Institute of Science and Technology
基金
中央高校基本科研业务费资助(3142015105)
关键词
数值模拟
拉瓦尔喷嘴
结构参数
Numerical simulation
Laval nozzle
Structural parameters
