Simulation Study Of Sugarcane Havester Impurity Removal Based On CFD-DEM

Impurity content is an important indicator of the quality of sugarcane harvester,and the level of impurity content is mainly affected by the performance of the excluder devices of the sugarcane harvester.Therefore,the study of the operation mechanism of the excluder devices is one of great significance to the optimization of the excluder devices,the reduction of impurity content and the improvement of the harvester operation quality.In this paper,a simplified geometric model of the excluder devices is first established.Then sugarcane materials after cutting are classified,modeled by EDEM Discrete Element Software,and the intrinsic parameters of these material were measured by physical experiments.The steady-state wind field simulation of this type of harvester’s excluder devices was carried out in Fluent software,and verification is carried out through laboratory tests.On this basis,The coupling modle of excluder devices-sugarcane stalks-sugarcane tail(broken cane)-leaves section was built based on CFD-DEM(Computational Fluid Dynamics Coupled Discrete Element Method)method,and the results were verified by field experiments.Finally,through the coupling model,the traces of sugarcane material in the excluder devices,the distribution of air pressure and velocity vector in the excluder devices were analyzed,and the reasons why the excluder devices failed to clear the sugarcane leaves were obtained.By comparing the experimental results with the simulation results,we found the coupling modle of excluder devices-sugarcane stalks-sugarcane tail(broken cane)-leaves section is reasonable.Therefore,it can be used to simulate the operation mechanism of impurity removal device.The main reasons for the failure of sugarcane leaves to be discharged by the excluder devices are as follows:dropping by fan blade,structural design problems of the excluder devices prevented the rise of sugarcane leaf,partial eddy currents and counterpressure gradients in the flow field of the device increase the retention time of sugarcane leaves and affect the removal efficiency of impurities.