风幕式喷杆喷雾雾滴漂移距离计算方法研究

Research on the Calculation Method of Droplet Drift in Air Curtain Boom Sprayer

基于Miller P H雾滴速度模型和离散相模型的粒子跟踪技术,就侧风风速、风幕出风口气流速度和喷雾压力对雾滴漂移的影响展开研究,获得了风幕式喷杆喷雾漂移距离计算方法。同时,利用风幕式喷杆喷雾气液两相流系统试验平台和自制的雾滴承接器进行了与计算相对应的试验研究。对比显示计算与实验结果基本一致,说明该风幕式喷杆喷雾漂移距离计算方法是可行的。计算和试验研究显示:风幕能有效地抑制雾滴漂移现象,在4级风以下(含4级风),风幕式喷杆喷雾机也能正常作业;当无风幕和侧风时,雾滴漂移距离为65~1 7 0 mm;当侧风风速增大至4 m/s时,无风幕情况下雾滴漂移距离增大了5 2.4倍,而当风幕出风口气流速度增大至12.3m/s时,雾滴漂移距离降低至340~390mm。

Based on the Miller PH droplet velocity model and the particle tracing technique of the discrete phase model,this paper studies the effect of the lateral wind speed,air curtain airflow speed and the spray pressure on the droplet drift,and the calculation method of air-assist boom spraying drift distance is obtained. The comparison shows that the calculation method is basically the same as the experimental results,which shows that the air-assist boom spraying drift distance calculation method is feasible. Computational and experimental studies have shown that the air curtain can effectively inhibit the phenomenon of droplet drift,in the 4 wind（including 4 wind）,air curtain spray sprayer can work properly. When there is no air curtain and lateral wind,the droplet drift distance is 65-170 mm. When the lateral wind speed increases to 4 m/s,the droplet drift distance increases by 52. 4 times. When the air curtain airflow speed is increased to 12. 3 m/s,the droplet drift distance is reduced to 340-390 mm.