关键词: 油菜籽, 旋风式干燥筒, 数值模拟, Fluent

Abstract: In order to avoid the appearence when the already being dried rapeseed could not be separated in time during the operation of rapeseed spin dryer, this paper simulated the air flow field of main working part of rapeseed spin dryer-drying cylinder with the software Ansys Fluent, and explored the effect of airflow inlet type, velocity of inlet airflow and inlet sectional area etc. factors of the drying cylinder on rotational strength of airflow field, velocity component and pressure drop etc. indexes. The paper also estimated, simulated and analyzed the characteristics of outlet airflow field of drying cylinder for effective separation of rapeseed; used a pitot tube to measure the airflow field velocity at the outlet of drying cylinder to verify the correctness of the simulation method. The results showed that the spiral airflow inlet was better than the tangential one in carrying capacity and material separation performance. When the inlet sectional area was constant, the larger the velocity was, the more favorable the airflow field distribution in the drying cylinder was for material separation. The inlet sectional area of the drying cylinder was positively correlated with pressure drop, and had effect on airflow velocity at the outlet section. The airflow field at the outlet was simulated and verified by experiments, and the change trend of airflow field was consistent. The average error between the simulated value and measured value of the airflow velocity at the same point was 6.58%, which verified the correctness of establishing airflow field simulation model of the drying cylinder in this study.

Key words: rapeseed, drying cylinder of spin dryer, numerical simulation, Fluent