Numerical Simulation And Optimization Study Of Jet Mixing Apparatus For Spay

Plant protection is one of the most important section in agricultural producing. It is onexorable trend to mix the pesticide automatically in plant protection machine. The pros and cons of the mixing apparatus for spray was summarized. In this paper,the jet mixing apparatus wsa put forward to. The research method of the jet mixing apparatus was overviewed. Combined the numerical simulation with the theory and experiment, the flow field was simulated. And the conclusion was compared among the theory,experiment and simulation in this paper. The main contents are as follows:1. The theoretical research on jet mixing apparatus for spary. Because of the low efficiency of the jet mixing apparatus for spary, the main loss of pressure was analyzed,expecially analysis the loss in mixing tube. The characteristic curve and the theoretical method to the main configulation parameter were introduced in this part.Meanwhile the principle of numerical simulation was presented.2. The simulation research on the jet mixing apparatus for spray. All the detail of the simulation was introduced, form modeling,meshing,boudary condition setting,solving and post-processing. Standard k ?εTwo-Equation Models was used for simulation. The internal workings was disclosed clearly. Simulation was carried out to research on the influence of the area ratio and the nozzle-to-pipe clenarance on the property,and comparation was made to the experiment result to ensure the validity of modle. The further simulation research was put up to survey to influence of the configulation parameter on the property fully and deeply.3. The experiment research on the property of the jet mixing apparatus for spary. In order to ascertain the influence of the main configulation parameter on the apparatus's property, the experiment was carried out to research the property of different area ratio at different nozzle-to-pipe clenarance when the pressure of the working fliud is 2.0MPa. According to the former experiment, a better group of the area ratio and nozzle-to-pipe clenarance was chosen to experiment the influence of the working fliud's pressure on the property.The simulation research on the jet mixing apparatus for spray. All the detail of the simulation was introduced, form modeling,meshing,boudary condition setting,solving and post-processing. Standard k -εTwo-Equation Models was used for simulation. The internal workings was disclosed clearly. Simulation was carried out to research on the influence of the area ratio and the nozzle-to-pipe clenarance on the property,and comparation was make to the experiment result to ensure the validity of modle. The further simulation research was put up to survey to influence of the configulation parameter on the property fully and deeply.The research conclusion are as follows:1,The main pressure loss of the apparatus are in the entrance of the diffusive pipe and the mixing tube, and enhance the velocity of the suction inlet can reduce the loss of pressure.2,The internal flow field was simulated, and found the lowest pressure is in the Entrainment Room. The backflow was detected in the entrance of the diffusive pipe when the pressure in outlet turn down.3,Area ratio and nozzle-to-pipe clenarance are the important parameters of the jet mixing apparatus for spray. The area ratio and nozzle-to-pipe clenarance have the optimum value. Oversize or undersize of the parameter would influence the property seariously, and the optimun value is related to other parameters.4,The cavitation phenomenon was emerged easily in the jet mixing apparatus for spray. The characteristic curve was invalid when the cavitation phenomenon appears,namely mixing ratio wasn't related to the outlet pressure.