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The paper presents the results of a theoretical study of the interaction of particles of grain material components with countercurrent flow of material into the air flow and variable flow velocity curves along the coordinate axes. It is established that the use of variable speed increases the magnitude of the splitting of the trajectories of motion and the efficiency of separation. Analyzing the results of mathematical modeling of the ballistics of the particles of the components of the grain material can be determined that the increase in the magnitude of splitting (branching) trajectories of the particle motion when using variable air velocity at the coordinates. The increase in the magnitude of the splitting of the trajectories unambiguously characterizes the increase of the efficiency of separation of components of the grain material into fractions according to the aerodynamic properties, which are known to tightly correlate with the qualitative indices of the grain material. The results of research of process of inertial fractionation indicate real opportunities to improve the efficiency of separating the material into fractions according to aerodynamic properties. The effect of the velocity plot of air in the air channel can be used to control the processes of separating the material into fractions.

Pneumonitis fractionation of grain materials in air streams of variable structure