Abstract：Secondary removal is an important process in corn plot breeding. Efficiency of debris removal device in plot harvesters affects the purity of corn varieties. This study designed a device with a wing-shaped curved surface to separate impurities based on the Coanda effect. This device improves the efficiency of the corn plot harvester's debris removal operation. Its small size reduces the amount of space it takes up in a corn plot harvester. The article analyzed the device flow field by ANSYS Fluent and investigated the velocity distribution law and pressure distribution law. The computations have obtained the airflow deflection angles for discs with radii of 42.5 mm, 105 mm, and 175 mm at different Reynolds numbers to optimize the initial model by CFD-DEM gas-solid coupling simulation experiments. Besides, the experiment explored the separation effect of different diameters of grain mixtures by a one-factor control method, and article draws conclusions concerning confidence intervals for corn kernel velocities at different inlet wind speeds. The bench test data indicated that the impurity content of corn kernels was as low as 1.01%, and the operational performance index of this device met the expected design requirements. The research results provide a new reference program for the design of the debris removal device of corn plot harvester.
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