Journal
COMPUTERS AND ELECTRONICS IN AGRICULTURE
Volume 105, Issue -, Pages 121-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compag.2014.04.014
Keywords
Fertiliser spreader; Centrifugal; Aerodynamics; Fertiliser particle spin; Magnus force
Funding
- Technology and Food Science Unit of the Institute of Agricultural and Fisheries Research (ILVO), Belgium
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A three dimensional ballistic model was developed to investigate the effect of spin on the trajectory of fertiliser grains in the air and their subsequent landing position. In addition to the gravitational- and drag force, also the Magnus force and drag torque were included in the model. Because of the considerable uncertainty regarding the spinning velocity of the grains, initial conditions for the ballistic model were simulated using a newly derived analytical model that describes motion on a concave disc. In both models, grains were presumed to be perfectly spherical. Simulations indicated a major effect on the landing positions of individual grains although the magnitude was dependent on fertiliser- and spreader characteristics. Deviations up to 33% of the total travelled distance in the direction of the initial horizontal velocity vector were found. Furthermore, the Magnus force clearly causes a deflection of the trajectory in the horizontal plane. (C) 2014 Elsevier B.V. All rights reserved.
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