Research On The Key Technology Of Air-driven Orchard Electrostatic Sprayer

According to statistics from the agricultural department,my country’s pesticide production technology is at an internationally advanced level,but there are problems such as low effective utilization of pesticides,excessive pesticide residues in agricultural products,environmental pollution,crop phytotoxicity,and operator poisoning.The main reason is that the application process and the application equipment are backward.In response to the above problems,this article is based on a combination of numerical simulation technology and experimental research,combining pneumatic conveying technology and induction electrostatic spray technology to conduct research on pesticide application related theories and equipment.It is hoped that through this research,the droplet penetration performance and deposition performance during the application process will be improved.The main researches are as follows:(1)Based on the CFD method,the airflow field of the sprayer is simulated and analyzed.In view of the uneven distribution of wind speed,the structure of the air duct was optimized and a splitter plate was added.Through orthogonal experiments,the influence of inlet intercept,outlet length,and outlet intercept on the speed of each outlet is found,and the best working parameters are found.The distribution law of the external flow field under the deflector at different angles is explored.Finally,the experimental verification was carried out based on the sprayer prototype platform,and a number of evenly distributed measuring points were selected for experimental measurement,which verified the reliability of the simulation results.It is determined that the air supply device can disturb the leaves of the plant and improve the droplet penetration ability.(2)Starting from the analysis of droplet charging theory and atomization mechanism,using inductive charging method,based on numerical simulation,the internal flow field of nozzles with different nozzle cap structure contours is simulated,and the internal pressure and velocity distribution rules of the nozzle are obtained.The factorial design experiment method and the Fluent solver are used to explore the influence of different structural parameters on the acceleration effect of the Venturi accelerating tube.(3)The nozzle performance test was carried out on the designed nozzle using the nozzle test level,and the influence of the nozzle structure parameters and electrostatic voltage on the nozzle flow rate,spray angle and uniformity were explored.(4)Through single factor experiments,the influence of driving speed,wind angle,nozzle height,fan air volume,and spray distance on the uniformity of spray in the vertical and horizontal directions was explored.A central combination design with 4 factors and 3 levels and a response surface analysis test method were used to study the influence of induced voltage,spray distance,fan frequency,and spray pressure on the droplet adhesion rate.A quadratic regression model was established with the droplet coverage rate as the response value,and the best spray parameters were obtained,and the model was tested and verified.The results of this research provide a research direction and reference value for the future research of the air-driven electrostatic sprayer.