基于CFD-DEM耦合的气力式导种装置中种子运动与受力研究OA

Aiming to enhance the seeding accuracy and uniformity of pneumatic maize planters under high-speed operating conditions,and reduce seed collision and deviation during the seed delivery process,a CFD-DEM coupled simulation model was developed based on aerodynamic principles to describe the airflow-induced motion of seed particles within the seed delivery tube.The motion response and force characteristics of seeds under airflow action were systematically analyzed.Considering a representative seed delivery structure,the effects of airflow velocity,structural parameters,and buffer zone dimensions on the horizontal velocity of seeds at the outlet were investigated.On this basis,the Box-Behnken design(BBD)method was employed to establish a response surface model for screening and optimizing key structural parameters influencing delivery performance.Simulation results indicated that a properly designed delivery structure can significantly reduce the frequency of particle-wall collisions and fluctuations in outlet horizontal velocity,effectively achieving"zero-velocity seed release".Further bench tests of the seed delivery system showed good agreement between the simulation and experimental results,with a maximum error of less than 8％,demonstrating the high predictive accuracy of the proposed CFD-DEM model.The research findings can provide a solid theoretical foundation and valuable engineering reference for the structural optimization of seed delivery systems and the development of precise seed release control strategies in high-speed pneumatic planting devices.