Research of a diametrical fan with suction channel

Mathematical modeling of the grain material separation in the pneumatic system of the grain-cleaning machine

“…The experimental data were confi rmed by theoretical studies of the mathematical description and modeling in the form of a polydisperse two-phase fl ow with regard to concentration, inertia, relaxation time, resistance coeffi cient. Similar studies were carried out by other scientists, which are refl ected in the works [1][2][3][4][5][6][7][8][9][10][11][12][13]. The adequacy of the model, theoretical and experimental studies is confi rmed by their convergence (reliability is 0.97), which suggests that the possibility of accepting the results is reliable.…”

“…The experimental data of the distribution of air velocity in the pneumatic systems of the existing modern GCM showed that the air fl ow in the pneumatic separating channel is unevenly distributed and varies over a wide range (coeffi cient of variation v to 37%). This is evidenced by the results of other researchers [1][2][3][4][5][6][7][8][9][10][11][12]. This indicates that the technological process of separation of the grain pile in the GCM pneumatic system proceeds in violation of agrotechnical requirements.…”

“…In such fl ows, light particles move (are separated) by the air fl ow due to the aerodynamic drag force, which exceeds the gravitational force, the cause of which is the difference in air velocity and particle. Heavy particles mostly move (separated from the light ones) under the action of gravity, while the aerodynamic drag force acts slightly [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The force of aerodynamic drag is determined by the expression: (1) where C D is the aerodynamic drag coeffi cient of the particle, ρ g is the air density, kg / m 3 (ρ = 1.225 kg / m 3 ); d р -particle diameter, m; U is the air fl ow speed created by the fan, m / s; V -particle velocity, m / s. (6) The aerodynamic drag coeffi cient of spherical particles C D is determined according to the Rayleigh curve depending on the Reynolds number Re (C D = f (Rе)) [1][2][3].…”

“…occurs by airfl ow [1][2][3][4][5]. However, modern grain cleaning machines for preliminary cleaning of grain pile with a pneumatic system as their main working element, in their operational qualities do not fully meet the increasing requirements of modern agricultural production [6][7][8][9]. Due to the imperfection of the design of the pneumatic system, there is an increased dustiness in the service areas and poor-quality separation of the grain pile by the air fl ow [10][11][12].…”

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

“…Seeds often fail to meet the qualitative criteria for processing in the food industry and are frequently disqualified. Therefore, seed cleaning methods are continuously optimized, and new equipment and devices that meet stringent industrial requirements and consumer expectations are being developed [1][2][3][4][5][6]. High qualitative standards are imposed not only on the principal cereal species, but also on buckwheat, which has emerged as an important source material for the production of gluten-free foods in recent years [7].…”