风幕式喷杆喷雾气液两相流数值模拟  

Numerical Simulation on Gas-liquid Two Phase Flow of Air-assist Boom Spraying

作　　者：燕明德[1,2] 毛罕平[1] 贾卫东[1] 董祥[2] 李成[1] 赵丽伟[2] 

机构地区：[1]江苏大学现代农业装备与技术教育部重点实验室,镇江212013 [2]中国农业机械化科学研究院土壤植物机器系统技术国家重点实验室,北京100083

出　　处：《农业机械学报》2013年第10期68-74,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：江苏省自然科学基金资助项目(BK2011048);江苏省高校优势学科建设工程资助项目(PAPD);土壤植物机器系统技术国家重点实验室开放基金资助项目(2011-SKL-1)

摘　　要：建立了风幕式喷杆喷雾的数值计算模型并运用Fluent软件对其气液两相流场进行了模拟研究,分别研究了风幕气流、风幕出风口与喷口水平及垂直相对位置和喷施角度对于喷雾流场的影响。研究结果表明:随着风幕风速的逐步增大,风幕气流对于气相流场和喷出雾滴的影响逐步增大;当风幕出风口与喷口在水平方向拥有合理的距离时,风幕气流能够发挥较好的防飘移作用;风幕气流在垂直方向远离喷口等效于风幕气流速度的减小,因而其防飘移效果逐步变差;喷施角度变大后雾滴的垂直方向动能变小,有更多的雾滴因为其垂直方向动能的衰减而难以到达采样面,从而造成雾滴群的防飘移性能逐步变差。A numerical calculation model of air-assist boom spraying was established. The Fluent was used to simulate the gas-liquid two phase flow field of air-assist boom spraying when the operational parameters of influencing factors changed, including airflow velocity of air curtain, the horizontal and vertical relative position between the air curtain and the nozzle, and the spraying angle. The results showed that the influence of air curtain on gas-liquid two-phase gradually increased with the increase of airflow velocity of air curtain. The air curtain could be more useful to anti-drift performance when there was a reasonable horizontal distance between the air curtain and the nozzle. Air curtain going away from the nozzle in vertical direction was equivalent to airflow velocity of air curtain decreasing. Therefore, the anti-drift performance went weaker. With the increase of spraying angle, the kinetic energy of droplets in vertical direction decreased. More droplets were difficult to reach the sample surface because of the attenuation of kinetic energy in vertical direction, so that the anti-drift performance went weaker.

关 键 词：风幕式喷杆喷雾 Fluent模拟 数值建模 喷雾流场 防飘移性能 

分 类 号：S49[农业科学—植物保护]