摘要
利用马尔文测雾仪对内混式喷嘴在不同工况下的雾化特性进行试验研究。根据试验结果,分析气压、水压以及气液比等因素对液滴粒径及均匀性的影响。利用Fluent软件对内混式喷嘴进行数值模拟,研究喷嘴混合段以及外流场的粒径变化。结果表明:随着气压、气液比的增加,喷嘴的雾化粒径减小,且气压为主要影响因素;内混式喷嘴内部粒径先增大后减小,在喷嘴出口处锐减,外流场中粒径沿轴向方向逐渐增大;将喷嘴出口处模拟粒径与实验结果对比,粒径大小及其变化趋势吻合较好。
The atomization characteristics of internal mixing nozzle under different operating conditions are studied by utilizing the Malvern laser particle size analyzer. According to the experiment results,the influence of air pressure,hydraulic pressure and air-liquid ratio to droplet size and uniformity are analyzed. The three-dimensional flow field model of internal mixing nozzle is built to simulate the droplet size of mixing room and external flow field by Fluent. The simulation results show that the droplet size decreases along with the increase of the air pressure and the air-liquid ratio,moreover,the air pressure plays a main actor. The droplet size increases in the mixing room,and then decrease sharply at the domain of the outlet,the diameter of the external flow field increasing along the axis direction. The droplet size of the nozzle＇s outlet obtained in simulation matches the experimental result.
出处
《流体机械》
CSCD
北大核心
2015年第2期1-6,共6页
Fluid Machinery
基金
航空科学基金重点实验室类项目(2012024001)
关键词
内混式喷嘴
液滴粒径
数值模拟
试验研究
雾化特性
internal mixing nozzle
droplets size
numerical analysis
experimental study
atomization characteristics
