Simulation of injection separation for near infrared plastics sorting device
                                                  YU Hui1, YIN Fengfu2, YAN Lei2, LIU Zhen2, XUE Lianlian2, ZHANG Chao2
(1.School of Automotive Engineering, Beijing Polytechnic, Beijing 100176, China; 2.School of Mechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)


Abstract: Aiming at the problems of inaccurate ejecting and high air consumption in the plastic sorting device, a streamlined nozzle based on the Vidosinski curve was proposed. The twodimensional and threedimensional modeling of the nozzle were made by means of computational fluid dynamics (CFD) software. The Fluent software was used to solve and the Realizable kε model in the turbulence model for calculation was selected. The influence of total length of the nozzle, the length of the constriction, the outlet diameter and the shrinkage ratio on jet were analyzed from the aspects of jet velocity, length of jet core segment and air consumption. The simulation results indicate that the outlet diameter has the greatest influence on the jet of the nozzle, and the total length of the nozzle, the length of the constriction and the shrinkage ratio have a relatively small influence on the performance of the nozzle. When the total length of the nozzle is 25 mm, the length of the constriction with 4mm, the outlet diameter with 6mm and the shrinkage ratio with 1.6, the nozzle has a relatively good ejecting performance and consumes less air.
Key words: nozzle; computational fluid dynamics（CFD）; simulation; Vitozinsky curve