基于Fluent的组合气吸式排种器关键部件仿真研究

以棉花小区播种机排种器为研究对象，采用模拟仿真试验技术研究组合气吸式排种器排种过程，在排种器的吸气口截面设置不同的边界条件（包括压强和气流速度），在开放条件下分析导向槽盘上导向槽的速度场和压力场。结果表明，距导向槽盘中心越远的位置，其气流速度和压强越小。设置排种器吸气口界面的边界条件相同，针对气吸盘和导向槽盘组合后形成的气吸孔开展气流场仿真分析。入口处气流压强300 Pa、速度21.97 m/s，此时气吸孔气流场压强2 481.8 Pa、气流速度61.67 m/s，该仿真结果与试验所测得的结果基本一致。试验验证并确定排种器几何参数、动力参数对气流场的变化和影响规律，可为设计试制播种机提供参考。

Simulation of the combined air suction seed metering device based on FLUENT

Taking the seeder of cotton community seeder as the research object, the simulation test technology is used to study the seeding process of the combined air-suction seeder, and different boundary conditions (including pressure and airflow velocity) are set in the suction port section of the seeder, and the velocity field and pressure field of the guide groove on the guide groove disc are analyzed under open conditions, and the results show that the farther away from the center of the guide groove disc, the smaller the airflow velocity and pressure. Subsequently, the boundary conditions of the suction port interface of the seeder are the same, and the flow field simulation analysis is carried out for the air suction hole formed after the combination of the air suction cup and the guide groove disc, and the results show that the pressure of the air flow at the inlet is 300 Pa and the velocity is 21.97 m/s, and the air field pressure of the air suction hole is 2481.8 Pa and the air velocity is 61.67 m/s, which is basically consistent with the results measured in the test. Finally, the changes and influences of geometric parameters and dynamic parameters on the airflow field of the seeder were verified and determined, which provided theoretical support for the design of the trial seeder.