关键词: 隧道喷雾, 风送系统, EDEM-Fluent耦合, 幅宽, 雾滴均匀度

Abstract:  In order to solve the problems of fog drop loss and low pesticide utilization rate in the application process of hedge frame crops, a crawler selfwalking double tunnel sprayer was designed in this paper. The working principle of the machine was analyzed and the crawler chassis was designed. The minimum clearance of the chassis was 289 mm. An air delivery system was designed to increase the amount of fog drop deposition and reduce the droplet drift loss of hedge frame crops. The tunnel width expansion device was designed, which meet the application width of different crops, and the width expansion range was 600-1 200 mm. The number and layout of spray heads were designed. Based on the EDEM-Fluent coupling simulation, the state of fog droplets in different widths was studied. Under different widths, compared with the condition without wind, fog droplets were denser, and particles moved faster, which was more conducive to the deposition of fog droplets. A prototype was developed, and field tests were carried out. The results showed that the DR value of fog droplet uniformity increased by 8.45% under windy conditions. In windy conditions. The average value of DR was 0.85 in 900 mm, which was closer to 1. Finally, the test results were consistent with the simulation results. This study provided a new reference for the design of tunnel sprayers.

Key words: tunnel spray, air supply system, EDEM-Fluent coupling, width, droplet uniformity