With the information collected in the laboratory investiga-tions on the measurement of terminal velocity of soybean seeds, a plenum chamber was designed to provide a primary cleaning air stream to the grain material collected on the gathering tray in the threshing chamber.
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The plenum chamber was perforated in such a way that the airflow was sufficient to accelerate upward the material lighter than soybean seeds but not strong enough to suspend or convey the soybean seeds (fig. 6).
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It was determined that an increase in the airflow rate and an additional pressure drop were necessary for the pneumatic conveying system due to the incorporation of the first phase of the cleaning system