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

摘要： 为解决贯流风机在收获机械风场中尾端风速低以及前端两侧风力过小的问题，针对多功能联合谷物收获机，提取蜗壳形状、侧面封板、进风口前端间隙、进风口后端间隙、出风口上端间隙等多种影响因子，通过Fluent流体仿真分析和样机优化，对影响因子的变化逐个进行测试分析，优化对风机性能影响较大的影响因子，提升风机性能。结果表明，蜗壳形状、侧面封板、出风口上端间隙的变化对整机风场影响较大，两侧密封板的添加使得两侧前端风速由9~10 m/s提升至12~13 m/s，蜗壳形状优化和后端上口间隙调整将尾端均速由6~6.5 m/s提升至6.5~7.5 m/s。

关键词: 收获机械, 清选装置, 贯流风机, 结构参数优化, 蜗壳