How spray characteristics and orientation may influence spray drift in a wind tunnel

J.P. Douzals (1) , M. Al Heidary (1)

1 UMR ITAP - Information – Technologies – Analyse Environnementale – Procédés Agricoles

Crop protection product application may be subjected to drift. This paper aims at studying the effect of wind direction on drift and nozzle classification accordingly to [ISO 22369-1]. Experiments were realized in Irstea wind tunnel with wind speeds varying from 2 to 7.5 m.s-1 oriented in frontal or lateral position to a narrow spray boom including from 1 to 4 nozzles. A first set of experiments were conducted with the reference nozzle in frontal or lateral position and with 1 to 4 nozzles. A second set of experiments were conducted with a wide range of low drift nozzles (19 Flat Fan Air injection and 8 Twin jets Flat Fan Air Injection) with four nozzles at 7.5 m.s-1 wind speed. The results showed that DRF and DRL classification was significantly different depending on the nozzle type and working conditions. A global discussion is proposed for methodological aspects and practical conclusions for nozzle classification.

Mots clés: PROTECTION DES CULTURES; VENT; CLASSIFICATION; BUSE; TUNNEL; FRONTAL; LATERAL DRIFT; WIND TUNNEL; NOZZLE CLASSIFICATION

Domaines: Sciences de l'environnement

J.P. Douzals, M. Al Heidary. How spray characteristics and orientation may influence spray drift in a wind tunnel. International Advances in Pesticide Application 2014, Jan 2014, Oxford, United Kingdom. p. 271 - p. 278. ⟨hal-00934490⟩