Experimental study of airflow field distribution on the feature structure of cleaning screen with variable vibration intensity

Abstract

The distribution of the airflow field above a vibrating screen plays a critical role in the grain cleaning process. It significantly influences the distribution of agricultural materials on the screen and the cleaning performance. However, there is a notable lack of quantitative studies examining the airflow field distribution above vibrating screens at varying vibration intensities. This study investigates the airflow field distribution above screens with typical characteristic structures used in grain cleaning under different vibration intensities. The results indicate that the chaff screen exhibits superior flow conduction and transverse distribution performance at vibration frequencies. The circular punching screen demonstrates better longitudinal distribution performance and overall distribution uniformity at vibration amplitudes. Furthermore, the woven screen exhibits the smallest variation magnitude in the fluctuation range of airflow vertical velocity over time across different vibration frequencies, with a value of 0.13 m s⁻¹. These findings enhance the understanding of airflow field distribution across various screen types and provide valuable guidance for designing screens optimised to address diverse airflow requirements in grain cleaning applications.