Research On Structure Optimization Of Metal Vacuum Atomization Nozzle Based On CFD

Metal powder is an important industrial raw material with a wide range of uses and large demand.The mainstream production method of metal powder is the vacuum atomization powdering method.This method uses high-pressure airflow to impact molten metal to break it into tiny droplets and cool it into powder.The atomization process is simple but the mechanism involved is very complicated.A slight change in the nozzle geometry can significantly affect the quality of the atomized powder.This article takes a certain brand of vacuum air atomization equipment as the research object,studies the defects of its nozzles in actual production one by one,and optimizes the nozzles.The particle size analysis results of the produced powder show that the optimized design improves the atomization quality of the nozzle.The research in this paper is mainly divided into two parts:numerical simulation and experimental operation.In the first part,using single-phase flow simulation,the structure of the atomized flow field is analyzed.Through comparative experiments,the influence of the extension of the draft tube and the atomization pressure factors on the suction pressure under the nozzle is studied;multiple sets of experiments are set up to analyze the effect of the jet apex angle on the flow field structure.The first part of the numerical simulation research provides a targeted solution for nozzle optimization.In the second part,the nozzle is optimized and designed according to the problems encountered in actual operation,an open low-temperature atomization equipment is designed,which effectively improves the efficiency of the experiment.Install optimized nozzles on the open low-temperature atomization equipment and conduct experiments to verify the feasibility of the optimized scheme.Finally,the optimized nozzle was installed on the vacuum atomization powder making equipment for powder preparation experiments.The experimental results prove that the optimized nozzle yield rate of 20-40μm fine powder increased from 23.82%to 41.58%,the atomization process was stable,the powder particle size distribution was concentrated,and the optimized design reached the expected goal.This article focuses on the combination of practice and theory,and analyzes the problem under the guidance of theory,and studies reasonable and feasible optimization design ideas for tightly coupled nozzles.The optimization scheme effectively improves the atomization quality of tightly coupled nozzles.