Improving the mechanical-mathematical model of pneumatic vibration centrifugal fractionation of grain materials based on their density

Bredykhin, Vadym; Пак, Андрій Олегович; Gurskyi, Petro; Denisenko, S. N.; Bredykhina, Khrystyna

doi:10.15587/1729-4061.2021.236938

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…In work [14], the task of describing the relative movement of the i-th circular layer of raw materials with a certain density, taking into account the frequency of oscillations of the working surfaces of the vibro-pneumatic centrifugal separator and the speed of the air flow, which gives the raw materials the properties of a fluidized medium, is set. One of the solutions to this problem is the value of the radius of the i-th circular layer of raw materials at the exit from the separator.…”

Section: Results Of Simulation Of the Grain Mass Separation Process D...mentioning

confidence: 99%

Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model

Bredykhin,

Bogomolov,

Kis-Korkishchenko

et al. 2023

EEJET

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The object of research is the seed material and working bodies of a vibro-pneumatic centrifugal separator; the subject is their interaction. The established surfaces, which are the results of the simulation of the process of separation of seed materials in the vibro-pneumatic centrifugal separator, have a curve to the plane whose parameters are the speed of the air flow and the frequency of oscillations of the working surface. It is noted that this nature of the dependence of the purity of the «heavy» fraction of seeds on parameters of the separation process makes it possible to determine the rational ranges of these parameters, at which the maximum value of this characteristic is reached. Experimental simulation of the separation process in the vibro-pneumatic centrifugal separator of wheat, sunflower, and soybean seed materials under production conditions showed a high convergence of the results with the results of the simulation of the process under the same initial conditions. It was established that the correlation coefficients between the points obtained experimentally and obtained by simulation for the given results are in the range from 0.89 to 0.95. At the same time, the differences are the purity values of the «heavy» seed fraction, and not in the nature of its change due to changes in the parameters of the separation process. The expediency of using modeling when determining the rational values of the parameters of the separation process in the vibro-pneumatic centrifugal separator is noted. This will help increase the energy and resource efficiency of the equipment due to the absence of the need for experimental setup. The rational ranges of air flow speed and vibration frequency of the rotor of the vibro-pneumatic centrifugal separator for the separation of seed materials have been determined: wheat – 1.2...1.5 m/s; 4500...5100 cycles per minute; sunflower – 1.3...1.5 m/s; 4500...5000 cycles per minute; soybeans – 1.3...1.6 m/s; 5000...5500 cycles per minute

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Section: Results Of Simulation Of the Grain Mass Separation Process D...mentioning

confidence: 99%

Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model

Bredykhin,

Bogomolov,

Kis-Korkishchenko

et al. 2023

EEJET

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“…To eliminate this shortcoming, various structural and technological methods are used, in particular, the stratification of the grain mixture by an air flow on the scaly surface of the feeding device [14][15][16]. According to the authors, this makes it possible to increase the specific load and improve the quality of cleaning.…”

Section: Introductionmentioning

confidence: 99%

To the Theory of Grain Motion in an Uneven Air Flow in a Vertical Pneumatic Separation Channel with an Annular Cross Section

Stepanenko¹,

Kotov

Kuzmych³

et al. 2022

Processes

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The possibilities of the action of uneven air flows on the grain material in the separating channels are still not used enough. The reason for this is the insufficient knowledge of the processes of interaction of the components of the grain material with an uneven air flow. The purpose of the research is to increase the efficiency of grain material separation according to aerodynamic properties by purposefully changing the diagram of air velocities in the channel sections using the actions of lateral and aerodynamic forces. The separation efficiency of grain material components was determined by trajectory analysis. The different geometry of the pneumatic separation channel was studied. The study of the distribution of air velocity and air pressure vectors in a vertical annular channel was carried out using the FlowVision software. It has been established that a change in the air velocity diagram can be implemented both by changing the geometric parameters of the channel and by additional distributed air supply through the perforation in the side walls of the pneumatic channel. Based on the analysis of the velocity field, an improved scheme of a pneumatic gravitational separator is proposed for separating grain material into three fractions according to aerodynamic characteristics.

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Mathematical Modeling of the Process of Movement of Grain Material on the Surface of a Sieve of a Vibrating Pneumatic Pulse Separator

Stepanenko,

Volyk,

Kotov

et al. 2023

Vibrations in Engineering and Technology

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The results of a theoretical study of the movement of grain material on the surface of a unfailing sieve of a vibrating pulse separator are presented. The paper presents the power and kinematic model, geometric characteristics of the surface of the sieve of a vibrating pneumatic pulse separator in static, and kinematic processing parameters. Calculations based on the proposed model allow determining the forces of movement, velocity, and acceleration of seeds in the grain medium under the combined action of vibrations and pneumatic pulse flow. The following conclusions were drawn as a result of the research and analysis of the generated forces according to the developed mathematical model: the greatest influence on the process of moving grain material, both in the horizontal and vertical directions, is exerted by the force of impulse (pulsation) of the air flow, the pressure force above the overlying layers of grain material (for seeds in the middle part and on the surface of the sieve without a dip), friction forces, seed weight, and the Archimedean force; in order to intensify the process of fractionation of the grain medium, increase the productivity of the vibrating pneumatic pulse separator, it is necessary to increase the force of the pulsating air flow, the inertia of the oscillatory motion, friction and lateral pressure on the seeds in the grain medium. To solve this problem, it is necessary to optimize the amplitudes and frequencies of oscillations of the unfailing sieve of the vibrating pneumatic pulse separator. The analysis of the mathematical model showed the feasibility of using a vibrating unfailing sieve surface with the simultaneous interaction of the injecting pulsating air flow under the sieve to separate grain material by seed density. It has been established that in order to intensify the separation of grain material into fractions, while increasing the productivity of the technical means, it is necessary to increase the force of the pulsating air flow, friction forces, and lateral pressure. The dynamic model of the movement of grain material displacement and recombination is scientifically substantiated and technological recommendations for the separation of grain material into fractions by seed density using the proposed technical means of a vibrating pneumatic pulse separator with the use of a patented method of its separation are developed.

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Improving the mechanical-mathematical model of pneumatic vibration centrifugal fractionation of grain materials based on their density

Cited by 3 publications

References 10 publications

Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model

Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model

To the Theory of Grain Motion in an Uneven Air Flow in a Vertical Pneumatic Separation Channel with an Annular Cross Section

Mathematical Modeling of the Process of Movement of Grain Material on the Surface of a Sieve of a Vibrating Pneumatic Pulse Separator

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