Design Simulation and Test of Pneumatic Fertilizer Dispenser Based on DEM-CFD Coupling
The quality of fertilization operation directly affects the yield of crops.In order to improve the mechaniza-tion level of fertilization operation,this paper optimized and designed a pneumatic fertilizer discharger with high effi-ciency according to the principle of negative pressure adsorption.Firstly,the fertilizer particle model was established based on the discrete element method(DEM),and the model of the fertilizer discharger was simplified and meshed by Ansys software.The internal flow field of the fertilizer discharger was analyzed by Fluent module,and the pressure nephogram and air flow field trace diagram of the suction hole section were obtained.Then,the numerical simulation of the fertilizer discharger was carried out by using the EDEM-Fluent coupling module.Finally,the bench perform-ance test was carried out,and the performance indexes and optimal parameter combinations under different parame-ters were obtained.By comparing the results of simulation and bench test,the following conclusions are drawn:when the rotating speed of the fertilizer discharge tray is 43 r/min and the negative pressure is 7 kPa,the fertilizer dis-charge per circle is 4.46 g,and the variation coefficient of uniformity of fertilizer discharge is 8.72%,so the fertilizer discharge performance is the best,which meets the quality evaluation standard of fertilization machinery.This study can provide reference for the design of pneumatic fertilization machinery.
pneumatic fertilizer distributorfertilizerDEM-CFDbench test
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