| Abstrakt: |
This article provides a theoretical analysis of the feasibility of the outlet bend radius of a tangential wiping scarifier device. To achieve this, we analyzed the movement of particles in the outlet. The material particles processed in the device are discharged into the cylindrical surface of the outlet with the radius. When seeds collide with the cylindrical surface of the outlet, they can be damaged. Therefore, it is necessary to determine the outlet bend radius that would provide the lowest seed damage probability. To do this, we introduced a polar coordinate system. The particle moving from the deck to the cylindrical surface is affected by two forces: gravity, directed vertically downwards, and aerodynamic resistance. We composed differential equations for particle movement that help determine the position and the speed of the particle when it collides with the cylindrical surface of the outlet with the radius. We provide the dependences between the contact angle of the particle and the cylindrical surface and the speed of the particle in the outlet, depending on the radius at various rotation frequencies of the 0.15 m radius drum. Then we analyzed the movement of processed material particles along the cylindrical surface of the outlet. The particle experiences gravity, standard pressure from the outlet wall, and wall friction force. We composed and solved differential equations for particle movement to determine the standard pressure from the outlet cylindrical surface. The analysis of the dependences obtained showed that if a particle is moving along the cylindrical surface of the wiping scarifier outlet with the radius of 0.2-0.5 m, the drum radius 0.15 m, and its rotation frequency of 1,000-2,000 min−1, the standard pressure value does not exceed the seed destruction force. [ABSTRACT FROM AUTHOR] |
