Flow Field Characteristics And CFD Simulation Of SLG Continuous Powder Surface Modifvintz Machine

Being innovation powder surface modifying equipments, the SLG continuous powder surface-modified machine has been widely used in the powder engineering of China presently. But its useis not a long time. The purpose of this dissertation is to study and verify its working principle andto explore ways of its structural optimization. So, a comprehensive method including theoreticalanalysis, experimental test and computational fluid dynamics (CFD) is adopted to study the test andnumerical simulation of its flow field as well as its structural optimizing path. A SLG-3/200flowparameter detection and data acquisition system is designed and implemented to measure thevelocity, pressure and temperature values under various working conditions. It points out that themixing characteristics is the most important property of SLG modifying field and the quantitativeevaluating indicator is indicated. Due to its unique structure, the flow turbulence can be strengthenedto get a good modification effect. After a simulation method for the gas-solid flow field is presentedin detail, the simulation and theoretical analysis are carried out, which shows that the numericalresults are in good agreement with the experimental results. The turbulent kinetic energy dissipationrate, shear rate and vorticity distribution are essentially coincident within the SLG machinecharacteristics. Besides, the wear prediction method is also depicted. It reveals that the mechanismcomprising stirring and jet is the reason of SLG adapted to a wide range of different particle sizes.The way of its structural optimization and three improvement measures are presented.