Abstract
ABSTRACT This study presents a numerical and experimental comparison of two different types of radial fans used in an agricultural fertilizer spreader at a rotation of 4000 rpm. The numerical analysis was validated through experiments conducted on a test bench using a hot-wire anemometer for velocity measurements and a Pitot tube for pressure readings. A simulation of the agricultural fertilizer spreader was carried out after the experimental validation of the mathematical models of the radial fans on the test bench to evaluate the air distribution behavior along the application nozzles, which was compared to the experimental results. A turbulent mean-field was obtained using the Reynolds Averaged Navier Stokes (RANS) and the k-Epsilon turbulence model was used for two equations. The computational fluid dynamics software CFX 18.1 was used to solve the transport equations. Unstructured tetrahedral meshes generated by the ICEM CFD 18.1 software were used in all models. The applied method is adequate and able to reproduce the fluid-dynamic behavior of airflow in pneumatic systems of agricultural fertilizer spreaders, avoiding the need for prototypes.
Highlights
The growing increase in the world population has led to the need to produce more and in a smaller area, and good agricultural productivity requires that nutrients be in an adequate amount for plants (Camargo, 2012)
This study presents a numerical and experimental comparison of two different types of radial fans used in an agricultural fertilizer spreader at a rotation of 4000 rpm
The results of the numerical and experimental comparison of the air distribution system in the test bench with A1 and B1 radial fans need to be evaluated for the values of the dimensionless Yplus throughout the air distribution system to ensure that the results close to the wall are valid
Summary
The growing increase in the world population has led to the need to produce more and in a smaller area, and good agricultural productivity requires that nutrients be in an adequate amount for plants (Camargo, 2012). Some machines that perform the agricultural fertilization use the airflow to transport fertilizers to the application nozzles, providing uniform and precise distribution. These machines need a fan coupled to the system to generate the flow, creating an energy gradient that allows the desired airflow. The CFD techniques for turbomachinery modeling are the best tool for understanding certain complex aerodynamic phenomena characteristic of this type of flow. Studies developed by Junaidi et al (2015), Lam & Peng (2016), and Zhang & Baar (2018) showed that this technique is widely applied to various types of turbomachinery
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