播种机气送式集排器增压管内种子流运移特性研究

Seed Flow Migration Characteristics in Booster Tube of Gas-fed Collector

播种机气送式集排器增压管是种子颗粒输送过程中的重要组成部分,其结构直接影响到播种机的作业性能。本文运用理论分析与EDEM-Fluent耦合相结合的方法来研究增压管内种子流运移特性。经过理论分析后,得出影响种子颗粒的因素主要有增压管结构、输送气流和装置材料等。由于装置材料和输送气流均是外部因素,本文主要以油菜种子为例,研究增压管结构对种子颗粒运动状态的影响。耦合分析得出:常用增压管中V型波纹式的增压管对种子流有较好的扰动分散等作用;在气流速度为16 m/s时,增压管直径为30 mm、长度为100 mm、宽度为10 mm、深度为2 mm时出口种子流质量较为均匀,其变异系数为17.32%。开展台架试验验证了耦合参数和模型选择的正确性。

Compared with traditional mechanical seed metering,pneumatic seed collectors are beneficial for the configuration and efficiency improvement of seeders,and have become the main trend in the development of seed collectors both domestically and internationally.The pressurization pipe of the pneumatic collector of the seeder is an important component of the seed particle conveying process,and its structure directly affects the operational performance of the seeder.A combination of theoretical analysis and EDEM Fluent coupling was used to study the transport characteristics of seed flow in a pressurized pipe.After theoretical analysis,it was found that the main factors affecting seed particles included the structure of booster tube,the conveying airflow,and the material of device.Due to the external factors of device materials and conveying airflow,rapeseed seeds were mainly taken as an example to study the influence of pressure pipe structure on the motion state of seed particles.Coupling analysis showed that the commonly used V-shaped corrugated booster pipe had a good disturbance and dispersion effect on the seed flow.When the airflow speed was 16 m/s,the mass of the outlet seed flow was relatively uniform when the diameter of the booster pipe was 30 mm,the length was 100 mm,the width was 10 mm,and the depth was 2 mm,with a coefficient of variation of 17.32%.The correctness of coupling parameters and model selection was verified through bench tests.