风幕式喷杆喷雾雾滴粒径与速度分布试验

Experimental Investigation of Droplet Diameter and Velocity Distributions in Air-assist Boom Sprays

为了研究风幕出口风速和风幕出风口与喷口的水平距离对雾滴粒径和雾滴速度分布的影响,运用PDPA测试系统对不同条件下的风幕式喷杆喷雾气液两相流场进行了测试,对雾滴粒径、速度分布的测量结果进行了分析和讨论。结果表明:雾滴在气流场的作用下,随着风幕风速的逐步变大,雾滴的粒径变小且分布均匀,有效地增大了雾滴的沉积、减小了飘移。风幕出风口与喷口水平距离越近时,雾滴的穿透性能越好,向后飘移的趋势越弱。

In order to study the effect on air flow rate of air-assisted and the distance of air outlet to nozzle to the droplet diameter and droplet velocity, the air-assist boom spray field was tested and analyzed in various conditions using PDPA measurement system. According to the test results, the droplet diameter distributions, velocity distributions and the relationship between air pressure and droplet diameter were analyzed systematically. The test results indicate that under the influences of flow field,the higher the air flow rate of air-assisted is, the smaller the droplet diameter is, increasing the droplet deposition, reducing the droplet drift. And its distributions are more symmetrical. The closer distance between the air outlet to the nozzle, the better droplet penetration is, reducing the trend of droplet drift.