Evaluation of different wind tunnel protocols for spray drift risk assessment

David Nuyttens, M De Schampheleire, K Baetens, D Dekeyser

    Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureC1: Artikels in proceedings van wetenschappelijke congressen, die niet inbegrepen zijn in A1, A2, A3 of P1peer review

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    46 Wind tunnel measurements were carried out to measure airborne and fallout spray volumes for 10 different spray nozzles. Based on these measurements, drift potential reduction percentages (DPRP), expressing the percentage reduction of the drift potential compared with the reference spraying, were calculated following three different approaches (DPRPV1, DPRPV2 & DPRPH).
    The results showed the expected fallout and airborne spray profiles and the effect of nozzle type and size on DPRP values was demonstrated. For the standard flat fan nozzles, DPRPV1 values were the highest followed by DPRPV2 and DPRPH while for the low-drift nozzles opposite results were found. For the air inclusion nozzles, there was a relatively good agreement between DPRPV1, DPRPV2 and DPRPH values. All of this is important in the interpretation of wind tunnel data for different nozzle types and sampling methodologies.
    A comparison was made between the results obtained from the wind tunnel measurements and the results from direct field drift measurements. Results showed that in the wind tunnel, driftability experiments can be made with different spraying systems under directly comparable and repeatable conditions and this methodology is well suited to permit relative studies of drift risk. The wind tunnel approach, calculating the surface under the measured fallout deposit curve (DPRPH), was best suited to represent real near-field sedimenting drift characteristics.

    Oorspronkelijke taalEngels
    TitelProceedings III International scientific symposium farm machinery and process management in sustainable agriculture
    EditorsB Huygehebaert, E Lorencowicz, J Uziak
    Aantal pagina’s8
    Publicatiedatum2008
    Pagina's175-182
    ISBN van geprinte versie978-2-87286-061-6
    PublicatiestatusGepubliceerd - 2008
    EvenementIII International scientific symposium farm machinery and process management in sustainable agriculture’ - Gembloux, België
    Duur: 12-nov-200813-nov-2008

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