Authors

Abstract

To address the problem of grain residue commonly occurring during the operation of plot wheat breeding harvesters, the CFD–DEM coupling method was employed to investigate the airflow distribution characteristics and material conveying behavior within a pneumatic conveying device. Fan rotational speed, feeding rate, and the curvature radius of the lower conveying pipe were selected as experimental factors for single-factor and response surface experiments. The results showed that all selected factors significantly affected the conveying performance and residue rate. Specifically, the residue rate decreased with increasing fan rotational speed, increased with increasing feeding rate, and decreased as the curvature radius of the lower pipe increased. The response surface analysis indicated that the optimal operating parameters were a fan rotational speed of 2400 r/min, a feeding rate of 0.4 kg/s, and a lower pipe curvature radius of 420 mm, under which the minimum residue rate of 0.021% was achieved.

Abstract in Chinese

为解决小麦小区育种收获机在收获时易存在籽粒残留的问题，采用CFD-DEM耦合方法研究气力输送装置内气流分布特性及物料输送过程，选取风机转速、喂入量和下管道曲率半径为试验因素，开展单因素和响应面试验。试验结果表明，所选试验因素对试验结果均有显著影响，当风机转速增加时，残留率下降；当喂入量增加时，残留率上升；当下管道曲率半径增加时，残留率下降。响应面试验结果表明，当风机转速为2400 r/min、喂入量为0.4 kg/s、下管道曲率半径为420 mm时残留率最少，为0.021％。