Design of a Recycling Tunnel Sprayer Using CFD Simulations

Molari, Giovanni; Benini, L.; Ade, G.

doi:10.13031/2013.18309

Cited by 16 publications

(10 citation statements)

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“…Air-assisted tunnels with external air intake (Planas et al, 2002) must discharge to the outside the air volume fed by the fans into the tunnel, with the risk of losing some fraction of the smaller droplets and so increasing drift. Therefore, models with internal tangential-flow fans (Siegfried and Holliger, 1996) or axial-flow fans (Molari et al, 2005) have been proposed, working on the closed-loop concept of re-circulating the same volume of air inside the tunnel. The problem of fan contamination may be reduced by lamellae separators at the fan's intake (Ade et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Influence of canopy development in the vineyard on spray deposition from a tunnel sprayer

Pergher

Zucchiatti

2018

J Agricult Engineer

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Spray deposition from a tunnel, air-assisted sprayer was analysed during the whole season, following canopy development in a vertical-shoot-positioned vineyard. Four field tests were performed using hollow-cone, turbulence nozzles between the BBCH 15 (5 leaves unfolded) and BBCH 77 (berries beginning to touch) growth stages, plus an additional test with flat-fan, air-injection nozzles at BBCH 77. The main canopy parameters were assessed, including the canopy height range (0.6 m to 1.4 m), the leaf area index (LAI; 0.15 to 1.60) and the leaf layer index (LLI; 0.69 to 2.74). Total deposition on target (leaves and bunches) increased from 14.8% to 53.9% of volume applied, and was significantly related to the LLI (R² = 0.943); the relevance of such relationship in connection with the leaf wall area model for volume rate adjustment is discussed in the paper. Losses to the ground (1.9% to 8.1% of volume applied), spray recovery rate (31.0% to 67.2%) and losses owing to evaporation of the recycled liquid (0.1% to 3.5%) were also analysed. At BBCH 77, air-injection nozzles did not improve overall deposition in comparison to hollow-cone nozzles, but increased spray recovery (from 31.0% to 36.1%) and reduced (to 0.1%) evaporation of the recycled liquid, so that they may represent an option to avoid an excessive concentration in the tank towards the end of application.

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Section: Introductionmentioning

confidence: 99%

Influence of canopy development in the vineyard on spray deposition from a tunnel sprayer

Pergher

Zucchiatti

2018

J Agricult Engineer

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“…Furthermore, spray distribution quality, including losses to the ground and drift, is directly influenced by the type of sprayer. Models with internal tangential-flow fans (Siegfried and Hollinger, 1996) or axial-flow fans (Molari et al, 2005) have been proposed, owing to their potential to control air assistance. New developments such as automatic air assistance control (Garcerá et al, 2018) also reduce drift and improve canopy deposition.…”

Section: Fundamentals Of Dosaviñamentioning

confidence: 99%

DOSAVIÑA: Tool to calculate the optimal volume rate and pesticide amount in vineyard spray applications based on a modified leaf wall area method

Gil

Campos

Ortega

et al. 2019

Computers and Electronics in Agriculture

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DOSAVIÑA is a new tool (website and app for smartphones) developed for calculating the optimal volume rates and pesticide doses to apply during spray application processes in vineyards. DOSAVIÑA also calculates and recommends the optimal working parameters for working pressure, forward speed, and number and types of nozzles. DOSAVIÑA was developed by the Unit of Agricultural Machinery at the Universitat Politècnica de Catalunya, and is available for iOS and Android devices. It is also available on the DOSAVIÑA website (https://dosavina.upc.edu). The developed tool can be used for the calibration of spray applications on fruit trees (as well as on citrus orchards, olive trees, almond trees, and many other vertical crops) once the volume rate has been established. The system, which is based on a modified version of the leaf wall area (LWA) method, calculates the optimal volume rate for vineyards by considering the effects of leaf density, canopy width, and sprayer type. System testing took biological efficacy into consideration and measured the main factors used for characterizing spray processes, coverage, and distribution over the entire canopy.Results showed that water and pesticide use could be reduced by more than 20% while still meeting economic, environmental, and food quality requirements. The design of the tool is aligned with European requirements concerning pesticide use, as established in the European Directive for a Sustainable Use of Pesticides.

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“…The computational fluid dynamics (CFD) methods have been used in the spraying field [24,25] . This research 2 Materials and methods…”

Section: Introductionmentioning

confidence: 99%

Downwash distribution of single-rotor unmanned agricultural helicopter on hovering state

Zhang¹,

Xue

Sun

et al. 2017

International Journal of Agricultural and Biological Engineering

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The effective coverage and velocity of downwash are directly related to the assemblage of spraying system and spraying effect. The downwash of the unmanned agricultural helicopter (UAH) N-3 was discussed in the paper. The computational fluid dynamics (CFD) methods were used to simulate and analyze the distribution of the downwash, and a wind field measurement device had been designed to test the downwash of UAH N-3. In the tests, the UAH N-3 was raised up to 5.0 m, 6.0 m and 7.0 m from the ground, "annular-radial-distribution-point" method was introduced, 8 directions separated by an angle of 45° (the radial direction) with the intersection point of the main rotor shaft and the ground plane as the center, 0.5 m as the step length for the longitudinal (to 2.5 m) and radial (to 4.0 m) direction to set the sample points, considering the range of the rotor rotating circular area mainly. The 5 m height results of N-3 were fully discussed to describe the downwash distribution with the longitudinal altitude increased and the radial distance increased. The standard deviations of five test altitudes for eight directions were comparatively analyzed, the results showed that the total standard deviation was not greater than 0.6 m/s. The overall relative maximum margin of error calculated from the simulation and measurement data was between 0.6 and 0.7, which verified the credibility of the simulation data. High-order polynomials were used to fitting the simulation and measurement data, the fitting results showed that the polynomial coefficient of determination R 2 met or exceeded 0.75 when the altitudes were more than 1 m, indicating the fit equation having the reference values. When the altitudes equal or less than 0.5 m, the polynomial coefficient of determination R 2 was smaller, ranging during 0.3 to 0.7. The study would provide some foundations for the optimization of the assemblage of spraying system on the single-rotor UAH, which would promote China aviation plant protection.

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Design of a Recycling Tunnel Sprayer Using CFD Simulations

Cited by 16 publications

References 0 publications

Influence of canopy development in the vineyard on spray deposition from a tunnel sprayer

Influence of canopy development in the vineyard on spray deposition from a tunnel sprayer

DOSAVIÑA: Tool to calculate the optimal volume rate and pesticide amount in vineyard spray applications based on a modified leaf wall area method

Downwash distribution of single-rotor unmanned agricultural helicopter on hovering state

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