摘要
为了描述雾滴颗粒特性与飘失之间的关系,用激光衍射粒度仪(PDPA)对植保机械标准扇型雾喷头的雾化场进行了研究,主要描绘了雾化场雾滴特征参数,并对雾滴尺寸空间分布和雾滴的运动进行分析,确定了飘失区域在雾化场中的位置,为进一步分析雾滴的沉降及漂移特性提供了理论支持。结果表明:在逐渐远离喷头的截面上,雾滴直径分布呈中间小边缘大的凹形椭球面,而轴向速度则是呈中间大边缘小的山丘形分布。雾锥体外层空间区域雾滴密度小,小雾滴能量小且易蒸发,易受周围环境影响发生飘失,是雾滴易飘失区域。
In order to study the relationship between the droplet and drift, the characteristics and performance of sprays produced by agriculture flat-fan nozzles were measured with Phase Doppler Particle Analyzer （PDPA）. Additionally the spatial distribution of droplet size and velocity were investigated, and the highly driftable area was ascertained. The results provide a reliable basis for the analysis of droplet deposition and drift. It is found that on sections below the nozzle, the droplet size distribution is like the inner surface of a rugby. The Median Volume Diameter（MVD） is the smallest at the centerline and increases with the distance from the centerline. But the distribution of vertical velocity is like a small hill, and declines toward the edge of the spray. The outer spatial region of the spray where the droplet density is low, and small droplets with little energy are easy to be vaporized because of the environmental factors, is the highly driftable region.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第9期95-100,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(30671388)
关键词
雾滴尺寸
雾滴速度
空间分布
漂失
droplet size
droplet velocity
spatial distribution
drift
