气力式水稻芽种直播精量排种器关键部件的设计与仿真

针对气力式排种器窝眼及吸孔内部的气流场难以进行精确计算和分析的 问题，论文结合生产实际确定了排种器窝眼滚筒的结构参数和工作转速，并应用Pro/E 软件 分别对排种器的窝眼滚筒、窝眼及吸孔内的气流场进行三维建模。利用CFD 软件对3 种不 同结构参数的窝眼及吸孔内的气流场进行仿真模拟，其结果表明：半球型窝眼的吸种性能理 论上优于锥孔型和直孔型；吸孔直径越大，吸种能力越强，吸种效果越好。此方法适于复杂 气流场的精确计算和仿真。

Design and Simulation on the Key Components of Pneumatic PrecisionMetering Device for Direct Sowing of Rice Bud-sowing

The sockets and sucking nozzles inside air field of pneumatic metering device are difficult to accurately calculate and analyze. Combined with the production practice, the paper determines the structure parameters and working speed of the socket cylinder-seeder, and uses Pro/E software to build 3D model of socket cylinder-seeder, sockets and sucking nozzles inside air field. CFD software is also used to simulate the inside air field of sucking nozzles and sockets which have three different structure parameters. The simulation shows that the hemispherical socket is better than conical socket and straight socket in theory; the bigger sucking nozzle diameter, the stronger sucking ability, and the better sucking effect. The method is suitable for calculating and simulating complex air field accurately.