内混式空气雾化喷嘴出口尺寸对雾化特性的影响  

Influence of outlet size on atomization characteristics of internal mixing air atomization nozzles

作　　者：邵和 王鑫 李文璞 SHAO He;WANG Xin;LI Wenpu(School of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan 030600,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西太原030600

出　　处：《实验技术与管理》2024年第7期46-52,共7页Experimental Technology and Management

基　　金：国家自然科学基金项目(51804210)。

摘　　要：为了优化喷雾效果,分析内混式空气雾化喷嘴出口尺寸对其雾化特性的影响,基于自行设计的空气雾化喷嘴喷雾特性实验平台,使用粒子图像速度场仪、激光粒度仪对不同出口尺寸的空气雾化喷嘴雾化特性参数进行测定,分析其变化规律。实验结果表明:仅改变喷嘴出口尺寸时,随着出口尺寸的增加,空气雾化喷嘴气流量几乎保持线性增长趋势,而水流量呈现出对数增长的规律;其他条件固定时水流量与供水压力成正比,与供气压力成反比;气流量与供气压力成正比,与供水压力成反比;随着出口尺寸的增大,喷嘴有效射程不断增大,而雾化角逐渐变小;雾滴的索特平均直径(SMD)随开口尺寸的增加先增大后减小,空气雾化喷嘴出口尺寸为3.0 mm时SMD达到最大,出口尺寸为1.0 mm时雾化效果最好,此时雾滴粒径随时间变化标准差较小,液滴状态稳定;随着喷嘴开口的增大,雾滴速度先增大后减小,雾滴速度在轴线方向上逐渐减小。[Objective]Pneumatic forces play a significant role in facilitating liquid fragmentation and atomization.At low injection pressures,air flow can enhance liquid atomization,thereby greatly improving the atomization effect.This study aims to optimize the spray effect by analyzing the impact of the outlet size of internally mixed air atomization nozzles on their atomization characteristics.Leveraging a custom-designed air atomization spray experimental platform,actual measurements were conducted on gas–liquid flow rates,atomization angles,droplet sizes,droplet velocities,and other characteristic parameters for air atomization nozzles with different outlet sizes.We then performed a comparative analysis of the experimental results.[Methods]This study utilized a gas flowmeter and a liquid flowmeter to measure the changes in gas-liquid flow rates under seven different outlet sizes(1.0,1.5,2.0,2.5,3.0,3.5,and 4.0 mm).A high-speed camera analyzed patterns of changes in atomization angles and effective atomization ranges.Additionally,a laser particle size analyzer and a particle image velocity instrument examined the distribution patterns of droplet sizes and droplet velocity characteristics within the jet field.[Results]Comparative analysis of the experimental results revealed that as the outlet size increased,the water flow rate of the nozzle gradually increased.When the outlet size continued to increase,the trend of water consumption growth gradually leveled off,exhibiting a logarithmic growth pattern.At constant water supply pressure,the water flow rate was inversely proportional to the air supply pressure.Conversely,at air supply pressure,the water flow rate was directly proportional to the water supply pressure.The gas flow rate increased linearly with the enlargement of the outlet size,with the change slope being inversely proportional to both the air supply pressure and the water supply pressure.Increasing the nozzle outlet size reduced the exit resistance of the air cap,causing the pressure in the mixing chamber

关 键 词：空气雾化喷嘴 出口尺寸 流量特性 雾化粒径 雾滴速度 

分 类 号：TD714[矿业工程—矿井通风与安全]