Results of experimental research in separator dielectric aspiration channel

Abstract

Aerodynamic seed separators are the simplest and most bionically grounded. Therefore, it is necessary to use exactly such machines for separation, having previously increased their efficiency. It is determined that not enough attention has been devoted by scientists to justification of parameters and operation modes of vertical free-fall aspiration machines and influence of the electric field on the working process of such separator. We propose an experimental unit of an aspiration seed separator with a dielectric channel. In it, seeds are separated and dispersed according to their specific mass when falling in a counter air flow, as well as when interacting with an electric field. The effective length of the dielectric aspiration channel of the separator is one of the important technical parameters. It has a critical influence on the seed separation process. The hypothesis assumes that, if the vertical channel length is short, there will be little splitting of the vertical seed trajectory. As a result, this will lead to the negative effect of the migration of poor quality light seeds of the technical fraction into the seed fraction. The value of the input voltage on the outer surface of the dielectric aspiration channel of the separator also has a significant influence on the total quality of the separator function. As a result of the interaction, the light seeds, closest to the side

walls with the bifilar coil, begin to split their vertical trajectory additionally by the force of electrical attraction when they are moving from top to bottom. Therefore, in the course of the experimental research the rational value of voltage feeding on the electrodes of bifilar coil located on the outer surface of separator’s aerodynamic channel is found. The article presents methods and results of laboratory research and calculations of rational length of the dielectric aspiration channel of the separator and rational value of the feeding voltage on the bifilar coil. As a result of researches the dependence of the radius of seed dispersion on the length of the vertical dielectric channel of the separator was obtained. The analysis of the parameters of the proposed installation is given. The obtained experimental parameters allow developing a concept of the aspiration seed separator with a dielectric channel, which will improve the quality of seeds and reduce the cost of seed preparation.