Multi-rotor plant protection drones have been widely used in the field of agricultural plant protection. When working, the downwash air field generated by multiple rotors of the drone can increase the permeability of the spraying liquid, improve the spraying effect, and reduce the consumption of pesticides. However, the existing multi-rotor plant protection UAVs also have some deficiencies, mainly in that the influence of the downwash wind field on the liquid spraying flow field is non-uniform, non-constant, and uncontrollable.
First of all, the rotor layout of multi-rotor plant protection drones is generally centrosymmetric, with multiple arms surrounding the central frame. The multiple nozzles of the plant protection UAV are arranged in a line, and the central frame of the multi-rotor plant protection UAV is located in the middle of the length direction of the multiple nozzles arranged in a line. When the spray width is much larger than the wheelbase of the multi-rotor, the downwash The air flow is strong in the middle and weak at both ends in the direction of the entire spray width, which is non-uniform. Secondly, the downwash airflow of the multi-rotor plant protection UAV system is generated when the rotor generates lift. It is not specially designed to increase the uniformity and permeability of the liquid medicine. The liquid medicine has not been sprayed before the drone takes off. At this time, the overall weight of the UAV is large, and the required lift force is also large. At this time, the downwash airflow is strong; with the liquid spraying, the amount of liquid medicine on board becomes less, the overall weight of the UAV becomes lighter, and the required lift force becomes smaller. The airflow becomes weaker. However, the spraying rate of the liquid medicine remains basically constant, which leads to the non-constant and uncontrollable influence of the downwash air field on the spraying flow field of the liquid medicine.
Multi-rotor plant protection UAVs can realize water-saving irrigation of farmland crops. During the growth of crops, it is necessary to know the change of soil humidity at any time. UAVs can be used to implement irrigation, drip irrigation, and micro-irrigation of farmland in an integrated manner, thereby Achieve scientific irrigation, better maintain the soil growth humidity suitable for crops, realize automatic quantitative spraying of pesticides, reduce the pollution and damage of pesticides to the soil environment, and save water and pesticides. The use of drones to spray drugs can also increase The penetration of pesticides to crops can better ensure the growth environment of crops.
The multi-rotor plant protection drone can also sow crops, which overcomes the problems of low efficiency and cumbersome process of manual sowing. The use of drones to sow crops can not only make the crop density evenly distributed, but also ensure its stability, saving time and effort.
Multi-rotor plant protection UAV is an important part of modern agriculture and one of the important symbols reflecting the level of agricultural modernization. On the basis of the demand for aviation plant protection technology in China's agricultural modernization and the development status of domestic and foreign aviation plant protection, China's aviation plant protection The industry system has been deeply analyzed. The main problems restricting the development of China's agricultural aviation plant protection industry include the imperfection of the existing agricultural aviation policy and regulation system, the lack of supporting core scientific and technological research, the lack of professional personnel, the imperfect social service system, and the farmland operation environment compatible with agricultural aviation Infrastructure construction is neglected, and there is a lack of public welfare arrangements to support the development of agricultural aviation in the system. From the aspects of improving the adaptability of aviation plant protection operations with multi-model and multi-operation methods, increasing capital investment to strengthen the research of supporting core science and technology, and promulgating targeted policies to strengthen management and regulations, it is proposed to vigorously promote the rapid development of China's agricultural aviation plant protection industry. Strategies and countermeasures for healthy development.
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