Authors

Abstract

At present, the theory of precision pesticide application in agriculture and forestry has some shortcomings. Therefore, the Phase Doppler Interferometer (PDI) was used to establish the atomization model of three common brands (Lechler, Teejet and Feizhuo) flat fan nozzles in near fog field (0.3-0.5m) at low pressure (0.20-0.30mpa). The results show that the average absolute errors of droplet velocity of three brands of nozzles are 0.629, 0.521 and 0.684 m/s respectively, and the relative errors are 9.22, 9.60 and 11.89%, respectively. The average absolute errors of theoretical data of droplet size are 17.821, 13.801 and 22.140 μ m, and the relative errors are 8.40, 5.82 and 11.67%, respectively. The experimental theoretical model has high reliability. In addition, the results show that the droplet velocity and particle size increase with the increase of the equivalent diameter of the nozzle outlet. With the increase of spray angle, droplet velocity and particle size decrease gradually, and the rate of velocity decrease gradually. The research results are of great significance to further analyse the atomization characteristics of flat fan nozzle and guide the precise application of pesticide.

Abstract in Chinese

目前，农林精准施药理论理论存在不足。因此，本研究利用相位多普勒干涉仪（PDI）建立了低压（0.20-0.30mpa）下近雾场（0.30-0.50m）三种常用品牌（Lechler、Teejet和Feizhuo）平扇形喷嘴的雾化模型。结果表明，三种品牌喷嘴液滴速度理论数据的平均绝对误差分别为0.629、0.521和0.684 m/s，相对误差分别为9.22、9.60和11.89%。液滴粒径理论数据的平均绝对误差分别为17.821、13.801和22.140μm，相对误差分别为8.40、5.82和11.67%。理论模型非常可信。此外，结果表明，液滴速度和粒径随喷嘴出口等效直径的增大而增大。随着喷雾角度的增大，液滴速度和粒径逐渐减小，且速度降低率逐渐减小。研究结果对进一步分析平风扇喷嘴的雾化特性、指导精准施药具有重要意义。