Simulation Research And Optimum Design Of Impurity Removal Device Of Segmented Sugarcane Harvester

In China,there is a problem of high impurity content in the mechanized harvest of sugarcane harvester.The effect of impurity removal is mainly affected by the performance of the impurity removal device.The key to reduce the impurity content is to optimize the structural parameters of the impurity removal device of sugarcane harvester and improve its performance.Therefore,it is of great significance to adopt advanced numerical simulation technology to analyze the flow field of the trash discharge device and optimize the structural parameters of the trash discharge device of the sugarcane harvester in order to reduce the trash content in the harvesting operation of the segmented sugarcane harvester.In this paper,the geometric model of the discharge device of 4GZQ180 B sugarcane harvester was established by using the software of Solid Works.After the grid was divided,the steady-state wind field was simulated by using the software FLUENT.Through the actual test,the wind speed and flow of the tuyere were compared with the simulation results,and the rationality of the numerical simulation model of the internal flow field of the discharge device was verified.After that,Tecplot was used to visualize the internal flow field of the device and find out the unreasonable position of the air flow field distribution.The influence of the structure of the collecting chamber,the number of blades,the structure of the outlet chamber and the installation angle of the guide plate on the internal flow field of the device was discussed.The structure of the collecting chamber and the outlet chamber that is not conducive to the discharge was optimized.The three blade axial flow fan structure that is more conducive to the discharge was selected Structure: determine 40 ° as the installation angle of the deflector.Then the intrinsic parameters,contact parameters and stacking angle of sugarcane were measured.The discrete element simulation model of sugarcane segment,sugarcane tail and sugarcane leaf is established,and the relevant contact parameters are calibrated by discrete element simulation.Finally,the method of cfd-dem coupling is used to verify the process of impurity removal and test the optimization effect.The two parameters of impurity content and impurity removal rate are selected to compare the effect of impurity removal before and after the optimization of the device.The final calculation results show that the impurity content is 14.08%and 81.81% before the structure optimization of the device,and 7.95% and90.42% after the structure optimization of the device,which is effective for the optimization design of the device.