Numerical simulation of two-phase “Air-Seed” flow in the distribution system of the grain seeder

Мударисов, Салават; Badretdinov, Ildar; Рахимов, Зиннур; Lukmanov, Ramil; Nurullin, Elmas

doi:10.1016/j.compag.2019.105151

Cited by 29 publications

(16 citation statements)

References 5 publications

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“…As the air-grain-drop mixture moves in the dressing chamber, the concentration of droplets will decrease due to settling on the surface of the seeds. Numerical calculations of the change in the concentration of the working fluid in the treatment chamber were carried out according to equation (21) with an equivalent diameter of the droplets of the working fluid of 25 μm (deq. = 25 μm) and various seed sizes.…”

Section: Resultsmentioning

confidence: 99%

“…The condition for the movement of a multiphase dispersed mixture in a processing chamber allows implementing the methodological foundations of the dynamics of multiphase media for mathematical modeling of seed surface coating with a working fluid [20]. In the research, works in the field of modeling the movement of air-grain and other multiphase mixtures in various working channels and pneumatic systems of agricultural machines were also used [21][22][23].…”

Section: Methodsmentioning

confidence: 99%

“…Thus, as a result of mathematical modeling, differential equations (5), (6), (21) were obtained that describe the process of coating seeds of grain crops with fine particles of the working fluid in the processing chamber, taking into account a decrease in their concentration. Differential equations (5), (6), (21) were solved in the MATLAB software package using the numerical method under the following initial conditions: 0; 0; 0; ) ) , where ) is the concentration of fine droplets of the working fluid at the time of injection into the treatment chamber. Due to the fact that the air flow rate is not constant, at each step of numerical integration, it is refined by equation 9.…”

Section: (6)mentioning

confidence: 99%

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Modeling of grain processing in a pneumomechanical dresser

et al. 2020

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To improve the quality and effectiveness of pre-sowing treatment of seeds of grain crops, a hypothesis was put forward on the possibility of using the air flow to continuously perform a set of technological operations in the process of dressing. The proposed approach is implemented in a unrivalled pneumomechanical deresser, in the processing chamber of which a multiphase flow of dispersed mixture “air-seeds-droplet” is formed. For the theoretical justification of the main parameters of the processing process, a mathematical model of the movement of seeds and fine droplets of the working fluid was developed and numerically solved taking into account the decrease in their concentration along the length of the working chamber. As a result, it was found that the speeds of seeds and drops of different sizes as they move in the processing chamber naturally increase, and the concentration of drops decreases asymptotically. It was revealed that to ensure high quality processing at the entrance to the processing chamber, the seeds should move in suspension with the speed of the corresponding droplet speed of the working fluid. The minimum path length of the “air-seed-droplet” mixture is substantiated, where the maximum decrease in the concentration of drops occurs due to the adhesion of seeds suspended in the air flow to the surface. The results obtained are important for optimizing the length of the processing chamber, substantiating the modes and parameters of the movement of air, grain and drops, at which full coverage of seeds with a minimum flow rate of the working fluid is achieved. In the long term, the research results will serve as the basis for optimizing the design and technological parameters of pneumomechanical dressers, which ensure high quality and efficiency of pre-sowing treatment of seeds of grain crops.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: (6)mentioning

confidence: 99%

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Modeling of grain processing in a pneumomechanical dresser

et al. 2020

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“…A rectangular collector (11) was mounted under the valves along the 16-chamber collecting box (6). When the valves opened, seeds fell into the collector and then they were sucked into the airstream generated by the suction fan (19). Then, the seeds went through the suction duct (12) to the separating cyclone located above the main tank (1).…”

Section: Test Facilitymentioning

confidence: 99%

“…As it is difficult to evenly distribute the seed stream in pneumatic seed drills, there is a wide range of publications about the causes of unevenness [ 7 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ] as well as methods and apparatuses used to assess seed sowing evenness [ 16 , 17 ]. There have been publications concerning numerical investigations of the movement of grain mixtures and the airstream escaping from dosing units [ 18 , 19 ], and the distribution of the seed-and-air stream in the distribution head [ 20 , 21 , 22 ]. Unfortunately, these investigations did not allow for the even distribution of the seed-and-air stream when the distribution head was tilted from the vertical position (tilt of the head) while sowing seeds on slopes.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Distribution Head Tilt and Diffuser Variants on the Evenness of Sowing Rye and Oat Seeds with a Pneumatic Seed Drill

Gierz

Markowski

2020

Materials

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Due to the sustainable development of agriculture machines with large working widths of 4–6 m or even 9–12 m are increasingly often used for agrotechnical operations. The sowing machinery whose working widths are much bigger than the width of the seed box is equipped with a pneumatic system for transporting seeds from the seed box to coulters. One of the structural elements that affect the sowing accuracy in such seed drills is the distribution head with a diffuser. This article is about research on the influence of the distribution head deviation from the vertical position and constructional variants of the diffuser (the number of diffusion rings and the configuration of their position in the diffuser pipe, which is the distance between them) on the accuracy of distribution of a stream of rye and oat seeds (a seed-and-air stream), which differ in physical characteristics. The main elements, i.e., the innovative stream distributor in the head and the diffusion rings were made using an original design and the rapid prototyping method. The research proved that a change of 0–10° in the angle of the distribution head deviation from the vertical position significantly affected the sowing quality of oat seeds only. The position (density) of the diffusion rings in the lower section of the diffuser (near the supply elbow) was the most effective for both oat and rye seeds, where the average values of the coefficient of variation were 5.31% and 4.62%, respectively. The research results can be used to redesign the construction of the diffuser of the seed drill distribution head so as to reduce the resistance of transport of the seed-and-air mixture in order to improve seed sowing evenness.

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