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Revista Ciencias Técnicas Agropecuarias

versão On-line ISSN 2071-0054

Resumo

HERRERA PRAT, Mario Ignacio; GARCIA DE LA FIGAL COSTALES, Armando Eloy; DE LAS CUEVAS MILAN, Héctor  e  MARTINS TEIXEIRA, Mauri. Wind effect on the airflow of a spray. Rev Cie Téc Agr [online]. 2015, vol.24, n.2, pp.44-48. ISSN 2071-0054.

Pesticide spraying by air-assisted sprayers bases its efficiency in air flow, which carries the pesticide to the tree, keeping in mind that it carries out its work in different environmental management systems and wind speed. In this work the interaction of the wind speed and direction were studied with the air flow through the use of computational fluid dynamics (CFD). Sprayers normally work in environmental conditions where the wind speed reaches up to 5 m•s-1, ant the knowledge of the aerodynamics of the airflow will provide elements for proper regulation of these in different working conditions. This paper show an analysis of the aerodynamics of the airflow before entering the spray to the foliage of the plant for wind speeds of 0, 1, 3 and 5 m•s-1 and wind directions at angles of 45º, 90º, 135º and 180º. The velocity distribution of the air spray TEYME ASS-800 model used in orchards is taken as experimental model. The work was done in a horizontal plane passing through the center of the fan to define the variation of the aerodynamic characteristics of the air flow produced by the fan. Both the speed and direction of wind changed the flow to the center of the wind direction and the maximum flow rate decreased with increasing wind speed of 38.6 to 34.3 m•s-1.

Palavras-chave : sprayer assisted by air; wind speed; ANSYS modeling.

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