关键词: 喷雾机, 葡萄, 导流结构, 螺旋风

Abstract: Based on the large grape leaves, poor curtain penetration and uneven droplet distribution, spiral air spray was used to improve curtain penetration and spray uniformity by using the strong disturbance of spiral wind and fluid spiral motion. The model was built by Solidworks and Fluent to optimize the internal structure and fluid distribution of the air hood. Indoor spray tests were conducted according to the simulation results when the installation angle of the inner baffle was 20°, 30° and 40°. The presence of spiral wind, nozzle aperture and nozzle pressure were taken as variables, and the uniformity of fog droplets was taken as evaluation index. The results of orthogonal test were analyzed by DesignExpert variance analysis and response surface analysis. The simulation results showed that when the inner baffle was installed at an angle of 30°, there were spiral wind characteristics and wind speed of 248 m/s at a distance of 0.1 m from the outlet. The test results showed that the influences on droplet uniformity were as follows: the presence or absence of spiral air, spray aperture and spray pressure. The diffusion ratio of droplet uniformity was the best when the nozzle aperture was 0.9-1.1 mm and the pressure was 0.28-0.32 MPa. When the installation angle of inner baffle of spiral air hood was 30°, there was spiral air, spray pressure was 0.3 MPa and spray aperture was 1.0 mm, the diffusion ratio was 0.783 6, thus, the uniformity of fog droplets was the best.

Key words: spray machine, grapes, diversion structure, spiral wind