The Design Of The Multi-channel Combined Nozzle Of The Air-borne Variable Sprayer And Study On The Performance

In the operation of orchard sprayer,reducing the waste of liquid medicine has been an important direction in the research of spray machine.In the development of spray machine,accurate spray is always the trend.In this paper,the research status and development status of air-feed sprayers and related spray machines are introduced.On the economic front,the working efficiency is analyzed the advantages and disadvantages of the spray machinery now,analyzes the deficiencies,especially now part of the spray machine of low efficiency,severe waste,this chapter points out the need to improve.Through the analysis of these situations and the requirements of the project,the task of this research is clarified and the work needs to be done.In this paper,the research direction and research methods of multi-channel nozzle design are established.Aiming at the requirement of precise spray design for more than three different structure of nozzle flow channel,respectively,the four nozzle,five fingers nozzle,those nozzle,and the wind velocity flow field and the atomization performance for the study of simulation and experiment.The simulation results show that the wind speed of the three is similar,and the wind speed of the four fingers is the largest,and the fifth finger sprinkler head is the smallest.The number of flow paths of the four fingers is relatively small,and the aperture of each runner is relatively large,so the wind speed loss is relatively small during the wind delivery.At the inlet wind speed of 20 m/s,get more flow nozzle inside the change of wind speed,and they come to the wind speed losses,including those nozzle maximum wind speed loss,four fingers nozzle is minimal.They finally by interpolation calculation flow axial pneumatic conveying distance,as far as four fingers nozzle where the distance of 1.963 m,the five fingers nozzle where the distance of 1.848 m,where those nozzle distance of 1.847 m,four refers to the nozzle of the air conveying distance,the biggest five fingers nozzle air conveying distance minimum.By simulation,the movement of the fog drops in the wind transport state of the three is obtained.In this case,the spray droplets of the four fingers are the fastest,and the motion speed of the spray droplets of the six fingers is the smallest.By wind velocity flow field experiments on three kinds of nozzle of a single nozzle and the function of the four refers to the nozzle at the same time the outlet flow field contours and export wind,it is concluded that four refers to the export of nozzle wind speed and wind send distance is the biggest,five fingers nozzle second,six nozzle is minimal.As the fan speed parameters are the same,it can be concluded that the internal wind speed loss of the four-finger sprinkler head is the minimum,and the five-finger sprinkler head is the second,and the six-finger sprinkler head is the smallest.The relationship between the particle size and the parameters and the distribution of fog droplets in each parameter were studied by the atomization test.It is found that the spray coverage of each point is the maximum under different fan speed and spray distance.The droplet size and droplet distribution of three sprinkler heads were studied.Was studied by particle diameter test particle diameter size and wind speed,pressure and the relationship between nozzle spray Angle,and the similarities and differences between the three types of nozzle is studied,and the fitting equation is established for further research.Droplets distribution is studied by using water sensitive paper test,it is concluded that the different distribution of spray droplets,and the relationship with the fan speed,compares their similarities and differences,and laid a solid foundation for further analysis.