双出风口四风道清选装置内部气流场仿真及试验

Simulation and Experiment of Airflow Field in Cleaning Device with Double Outlets and Four Ducts

针对传统水稻联合收获机普遍采用的单出风口三风道清选装置在收获喂入量8.0~9.0kg/s时存在清选损失率显著提高、籽粒含杂率增加、效率降低等难题,首先运用CFD软件对课题组研发的双出风口四风道清选装置和传统单出风口三风道清选装置进行了内部气流场数值模拟及对比分析,得出双出风口四风道清选装置内部气流场分布对收获喂入量8.0~9.0kg/s工作环境具有更好的适应性。在已搭建的试验台上布置了42个气流速度测点对双出风口四风道清选装置进行多因素正交内部气流场测量试验,结果表明:双出风口四风道清选装置的鱼鳞筛开度为18mm、分风板倾角Ⅰ为28°、分风板倾角Ⅱ为20°时,振动筛上方前、中部整体气流速度达到最大且后部气流速度回升幅度最大,有利于提高清选性能和效率。

Aiming at problems that cleaning loss rate significantly increased,grain impurity rate increase,low efficiency when traditional single outlet and three ducts cleaning device of rice harvester under 8. 0 kg/s 9. 0 kg/s feeding quantity working condition. First,the CFD software is used to simulate and compare traditional single outlet and three ducts cleaning device with double outlets and four ducts cleaning device of airflow field. It is concluded that the airflow field in the double outlets and four ducts cleaning device is more suitable for the working environment with 8. 0 kg/s 9. 0 kg/s feed quantity. Then,the multiple factors orthogonal airflow field measurement experiment is carried out on the double outlets and four ducts cleaning test-bed. The test results are obtained after processing and analysis： in a large amount of feed work environment,sieve opening,wind of plate angleⅠ,wind angle of plateⅡof multiple-ducts cleaning device should be respectively adjusted to 18 mm,28 degrees and 20 degrees. At this moment,the overall airflow velocity in the front of the top of vibrating sieve reaches the maximum and the rear airflow picks up the maximum,which is the most suitable for the working environment. It is helpful to improve the cleaning performance and efficiency.