关键词: 收获机械, 清选装置, 贯流风机, 结构参数优化, 蜗壳

Abstract: To address the challenge of low wind speed at the tail end and insufficientair flow on both sides of the front end of the cross-flow fan in the wind filed of harvest machinery, this study focused on the multifunctional combined grain harvester. Key influencing factors were identified, including the volute shape, side sealing plate, front-end inlet clearance, back-end inlet clearance and upper-end outlet clearance. Using Fluent fluid simulation analysis and prototype optimization, each factor was systematically tested and analyzed to determine its effect on fan performance. The goal was to optimize the parameters with the most significant impact and thereby enhance the overall performance of the fan. The results showed that the volute shape, side sealing plate, and upper outlet clearance had the most substantial influence on the wind field distribution. Specifically, adding two side sealing plates increased the wind speed at the front end from 9-10 m/s to 12-13 m/s. Optimizing the volute shape and adjusting the rearend upper clearance improved the average wind speed at the tail end from 6-6.5 m/s to 6.5-7.5 m/s.

Key words: harvesting machinery, cleaning device, cross-flow fan, structural parameter optimization, spiral shell