Aerodynamic Characteristics of Buckwheat Receiving the Cleaning Wind

Abstract

The grain loss, a standard for determining the operating performance of for multi-crops, is 2 % for paddy, 1 % for wheat, and as high as 4 % for buckwheat. In this study, to reduce the grain loss and improve the cleaning performance, the aerodynamic characteristics of buckwheat were investigated, and the coefficient of drag and lift necessary for predicting the scattering range of buckwheat were modeled. Owing to attitude changes, the buckwheat was found to have greater coefficient variations than paddy, wheat, and soybean. Thus, the overlap of scattering range between the buckwheat and trash increased, suggesting that the amount of buckwheat discharged outside the machine increases when trying to improve the quality at the clean grain outlet.