Impact of technical spraying factors on vertical liquid distribution with Agromehanika AGP 440 axial fan sprayer

Abstract

Original scientific paper The influence of technical spraying factors on vertical distribution of liquid and air velocity was observed and measured with vertical patternator device. In research, Lechler yellow (TR 8002C) and red (TR 8004C) nozzles are used with two different sets of fan rotor blades (two different air velocities) at 540 rpm of PTO. The research was set as controlled three -factorial experiment (without the influence of weather factors) with 8 treatments in 4 repetitions, for each side of Agromehanika AGP 440 axial fan sprayer. Technical spraying factors (ISO nozzle number, settings of fan blades and spraying height) have a high significant impact (**) on the main properties of the research (vertical distribution of liquid and air velocity). By decreasing the ISO nozzle number and air velocity the increase of liquid deposit is found on vertical patternator and with the increase of measuring height a non-uniform distribution of liquid and air velocity is found. In addition, a non-uniform distribution of liquid and air velocity is established between the left and right sides of the machine. With regression analysis between the vertical distribution of liquid and air velocity on both sides of the machine, a statistically significant coherence is determined (left side of the machine: r = 0,96; p < 0,01; right side of the machine: r = 0,97; p < 0,01). Keywords: air velocity; axial fan sprayer; nozzle; vertical liquid distribution; vertical patternator Utjecaj tehničkih čimbenika raspršivanja na vertikalnu raspodjelu tekućine s raspršivačem Agromehanika AGP 440Izvorni znanstveni članak Istražuje se utjecaj tehničkih čimbenika raspršivanja na vertikalnu raspodjelu tekućine i brzine zraka, mjerenu s uređajem vertikalnim peternatorom. Koriste se žute (TR 8002C) i crvene (TR 8004C) Lechler mlaznice te dva različito podešena zakošenja lopatica rotora ventilatora (dvije različite brzine zračne struje) pri 540 o/min PVT-a. Istraživanje se postavlja kao kontrolirani trofaktorijalni pokus (bez utjecaja vremenskih čimbenika) sa 8 tretmana u 4 ponavljanja, za obje strane nošenog aksijalnog raspršivača Agromehanika AGP 440. Tehnički čimbenici raspršivanja (ISO broj mlaznice, podešavanje lopatica ventilatora i visina raspršivanja) ostvaruju vrlo značajan utjecaj (**) na glavna svojstva istraživanja (vertikalna distribucija tekućine i brzine zračne struje). Smanjivanjem ISO broja mlaznice i smanjivanjem brzine zračne struje povećava se količina tekućine deponirana na vertikalnom paternatoru, te povećavanjem visine mjerenja na vertikalnom paternatoru dolazi do neuniformne raspodjele tekućine i brzine zračne struje. Uz navedeno, utvrđuje se neuniformna raspodjela količine tekućine i brzine zračne struje između lijeve i desne strane stroja. Regresijskom analizom između vertikalne raspodjele količine tekućine i brzine zraka s obje strane stroja utvrđuje se visoka statistički značajna povezanost (lijeva strana stroja: r = 0,96; p < 0,01; desna strana stroja: r = 0,97; p < 0,01).

Mathematical Method for Droplet Size Distribution of Agricultural Nozzles

“…b = 0 and/or c = 0 do not preserve the diffusion Eq. (5) and s = 0 was already excluded in (13). So the determination Eqs.…”

“…Many authors are interested in researching this area, so they investigate air velocity of air-assisted sprayers [9], spraying norm [8], nozzle position and orientation [10], nozzle types [11], spraying speed [12] and vertical liquid distribution [13]. The authors [3,14] study the impact of different ISO nozzle type on optimum surface coverage and drift intensity within permanent crops, and they are stating that nozzles with smaller ISO number achieve better coverage of the treated surface, but increased liquid drift, due to smaller droplets.…”

Effect of the Airblast Settings on the Vertical Spray Profile: Implementation on an On-Line Decision Aid for Citrus Treatments

“…The spray vertical profile is defined as the pattern and distribution of the amount of liquid flow rate released by the machine at different heights at a certain distance. It depends on several factors: the type, number, position and orientation of the active nozzles in the equipment, the overall sprayer liquid flow rate and the fan configuration [45][46][47][48], as the spray liquid distribution is directly linked to the generated airflow pattern and the airflow characteristics [12,36,49]. Several methods have been used to determine the spray vertical profile, including: analysis of deposition on water-sensitive papers [50][51][52], analysis of the movement of drops using laser or ultrasonic techniques [53,54], determination of the deposition of tracers on passive collectors [55,56], thermography [57] and, most commonly, the use of vertical patternators, which are devices designed to collect spray over a range of heights, using ad hoc accumulators, such as discrete metal or plastic trays, discrete collectors made of absorbent material or lamellae, which can be arranged horizontally and/or vertically [36,[58][59][60][61][62][63][64][65].…”

Uniformidade De Distribuição Volumétrica De Duas Pontas De Pulverização Sob Efeito Da Assistência a Ar Na Barra

“…A correta aplicação de produtos fitossanitários está intimamente atrelada ao potencial produtivo da lavoura, tendo em vista que a entrada de pragas, doenças e plantas daninhas acaba por gerar grandes prejuízos. Assim, grande parte das despesas dos produtores está relacionada à proteção da planta, contribuindo com o aumento do número de pesquisas com o objetivo de procurar modelos que reduzam esses custos (VUJČIĆ et al, 2015).…”