Dynamical Analysis of Impeller-type Rice Husker (Part 3)

The Bounce of a Paddy Grain on the Blade and Applicability of the Law of Proportion

Abstract

In the report of Part 1, the bounce of a paddy grain on the blade was neglected in the dynamics equation as well as the law of proportion. In this report, rotating coordinates that rotate at the same angular velocity as that of the dehulling fan, were introduced. The two laws of proportion, i. e., with respect to rotational angular velocity and similitude ratio, were proved to be valid not only for the rotating coordinates but also in the bounce equation. Through experiments of a paddy grain falling in a vacuum chamber, the bounce was recognized as a probabilistic phenomenon, but it became evident that the mean values of bounces satisfy the law of proportion and the bounce equation.