It is quite often to hear that the downward pressure of agricultural drones has a great effect when conducting spraying operations, making the pesticide spraying more penetrating. Then, what exactly is this "downward wind" that sounds so high-end?
The downward pressure of the ag drones for sale comes from its propeller, and the vortex airflow created by high-speed rotation (the vortex airflow and the airflow over the drone could form a pressure difference in order to provide powerlifting for hovering and flying in the air).
While the drone is conducting the flying operation, there is a certain distance from the crops, depending on the type of crops, the distance is normally between 1.5 meters to 10 meters. At this time, the pesticide sprayed from the drone fertilizer sprayer is similar to the mist. The particles are very tiny and capable to drift and float with the wind. It’s hard to spray on the crops, and it’s even harder to spray on the roots of the crops. At this time, the down pressure wind field of the drone plays an important role. The down pressure wind field combined with the high-pressure nozzle can make pesticides mist spraying more penetrating, reduce the drift and float of the pesticide liquid, and achieve the effect of deep penetration and even coverage. This means the pesticide liquid made its droplets more effective on the crops through nozzle spraying of the drone and the downward wind of the blades. Therefore it has a good prevention and control effect.
The wind and mist synchronization rate is the probability that the downward pressure wind and mist particles reach the crop canopy simultaneously; the "wind and mist synchronization rate" aimed to study agricultural drone‘s complicated mutual movement between the downward pressure wind and the mist particles.
Normally, there are three types of scenarios of pesticide mist particle in the air:
(1) When the Drone nozzle layout is not right under the propeller rotation radius, the severe mist particles rising will appear.
(2) Whether the drone uses a centrifugal or pressure nozzle, the flying speed and height above the crops will be in different situations. Occasionally the wind and mist may not be able to reach the crop canopy at the same time.
(3) The downward pressure is at its largest when the drone is hovering in the air, causing the crop to shake intensely from the root. During the flight, only the crop canopy branches and leaves would shake.
At present, the ideal situation is the third scenario mentioned above: The hovering. Generally speaking, when the flying speed of the agriculture pesticide spray drone is overly fast and the altitude is overly high, when the mist particles reached the crop canopy they will apparently lag behind the wind field.
Therefore, the down pressure wind of agricultural purpose drones is its own property. The wind field can lead the crops to shake irregularly. For those crops with high penetration requirements, reasonable flight operations should be carried out. Its "wind and mist synchronization rate" and optimized the spraying system requires further research.