Study On Multi Gun Spraying Interference Of Soybean Protein Liquid Based On Particle Size Analyzer And PIV

In order to solve the pollution problem of traditional non-degradable packaging bags,our research group started from the problem of convenient fabric packaging,and developed an edible vegetable paper packaging bag.Due to the poor heat sealing and mechanical properties of vegetable paper,a uniform layer of soybean protein film was coated on pure vegetable paper by spraying film,in order to improve the performance of vegetable paper,so as to realize the application of vegetable paper in packaging.In order to improve the efficiency of spraying coating,this paper carried out a double gun spraying experiment on the basis of the previous experiment to study the speed and particle size uniformity of the double gun spraying atomization field under the change of multiple parameters,providing a theoretical basis for wide coating.The main research contents of this paper are as follows:Firstly,this paper introduces the research status,experimental equipment,experimental process and data processing methods of relevant technologies at home and abroad,designs and constructs the atomization system of double gun spray field,and establishes the mathematical model of interference geometric parameters of double gun spray based on statistics,which lays a foundation for subsequent research.Secondly,based on PIV and statistical methods,this paper studies the influence of deflection Angle and spacing of two nozzles on the average velocity,combined velocity and partial velocity in X and Y directions on the deposition baseline under different pressure,hydraulic pressure and flow rate.The spraying atomization system controls the change of spraying parameters and adjusts the deviation Angle and spacing of spray nozzles.The PIV system is used to take photos of the double-gun spray field.Based on the principle of statistics,the average calculation of the images taken is carried out to obtain experimental data.(1)When the nozzle spacing,air pressure,hydraulic pressure and flow rate are constant,the average velocity on the deposition baseline decreases with the increase of deflection Angle.(2)Compared with the deviation Angle of 0°,the velocity of more particles passing through the deposited baseline in the interference zone increases when the deviation Angle is 7°.(3)Compared with the deflection angles of 0° and 15°,the velocity in the positive direction of X-axis moves to the left at 0°.(4)Under the same parameter,the velocity of each point on the sedimentary baseline is mainly affected by the fractional velocity along the Y-axis.(5)When the spacing is large,the average velocity on the deposition baseline is relatively small,indicating that the larger the spacing of spray nozzles,the smaller the interaction between the fan torches.Finally,the evaluation index of spraying particle size field is introduced.Compared with the experimental data of single gun spraying,the influence of viscosity,air pressure,hydraulic pressure and nozzle deflection degree on Sauter mean diameter(SMD)and dispersion of spraying particle size field is studied.The particle size data is processed by Spraylink software,and the experimental conclusions are as follows:(1)SMD of double gun spraying field increases first and then becomes stable with the increase of hydraulic pressure,and decreases first and then becomes stable with the increase of air pressure;When the hydraulic pressure is 0.08 MPa and 0.16 MPa,SMD does not change with the change of deflection degree,SMD increases with the increase of deflection degree while the hydraulic pressure is 0.24 MPa.(2)The radial SMD of the two-gun spraying field decreases slowly from the center to the edge,and the diameters of the two axial points in the interference region are basically the same.(3)With the increase of hydraulic pressure,the dispersion of double gun spraying field increases first and then decreases,and increases first and then tends to be stable with the increase of air pressure.(4)When the hydraulic pressure is 0.16 MPa,the radial dispersion of the spray field does not change with the change of deflection degree.When the hydraulic pressure is 0.24 MPa,the radial dispersion decreases slowly with the increase of deflection degree,and the axial dispersion in the interference region increases first and then decreases with the increase of deflection Angle.