切纵流联合收割机清选室内气流场的模拟仿真

Simulation Research of Airflow Field in the Cleaning Room Tangential-Axial Combine Harvester

切纵流联合收割机存在损失率大和含杂率高等问题,为分析清选性能较低的原因,对切纵流清选室内气流场分布进行模拟仿真,运用CFD仿真软件对清选室气道气流进行分析.仿真结果表明,清选室内气流在筛面宽度方向呈对称分布,沿筛面高度方向气流速度逐渐减小,沿筛长度方向筛前段气流速度较低,在接近筛中部时气流速度达到最大.并对清选室内气流场进行了测量试验,验证了气流场仿真的准确性.

There exist the problems of high rate of loss and great percentage of trash content for tangen- tial-axial combine harvester. In order to analyze the causes for low cleaning performance, airflow field dis- tribution in cleaning room of tangential-axial combine harvester was simulated,with the CFD simulation software to analyze the airflow in the air passage of the cleaning room. The results showed that the clean- ing room airflow distribution was symmetrical in the screen surface width direction; the airflow velocity decreased in the height direction gradually; the airflow velocity at the forepart was low in the screen length direction;the velocity reached the maximum near the middle of the screen. Airflow field in clean- ing room was also measured to verify the accuracy of the simulation experiment.