摘要
现有气雾化制粉设备所采用的分离器收集粉末的性能较差,同时其分级效率也较低,导致其无法满足金属增材制造的粉末粒度要求。为此,以两级串联旋风分离器为研究对象,对旋风分离器的连接管道直径及其他参数进行了数值模拟研究。首先,为了验证数值模拟计算模型及其边界条件的可靠性,进行了气雾化制粉试验;然后,采用计算流体力学(CFD)模拟技术,对旋风分离器进行了仿真分析,研究了连接管道直径的改变对旋风分离器流场,以及对压降、分离效率和切割粒径等分离器性能的影响;最后,在连接管道直径确定的情况下,对旋风分离器其他参数进行了模拟,分别研究了入口形状和锥体长度变化对旋风分离器流场及分离性能的影响。研究结果表明:当连接管道直径d=130 mm时,旋风分离器的分离效率最高,随着旋风分离器连接管道直径的增加,其切割粒径逐渐增加;当入口形状为圆形A时,旋风分离器的分离效率最高,随着矩形长宽比的增加,分离效率逐渐降低,切割粒径增加;锥体长度的增加使得旋风分离器的分离效率先升高后降低,采用方案3时的分离效率最高,切割粒径逐渐降低。
The separator used in existing atomization powder making equipment has poor performance in collecting powder,and its classification efficiency is also low,which makes it unable to meet the powder particle size requirements for metal additive manufacturing.Therefor,the two-stage series cyclone was used as the research object,and the connection pipe diameter and other parameters of the cyclone were numerically studied.Firstly,in order to verify the reliability of the numerical simulation model and its boundary conditions,the aerosolization powder production test was carried out.Then,computational fluid dynamics simulation(CFD)was used to simulate the cyclone,and the influence of the change of connecting pipe diameter on the flow field of cyclone separator and the performance of separator such as pressure drop,separation efficiency and cutting particle size was studied.Finally,other cyclone parameters were simulated when the diameter of the connecting pipe was determined,and the influence of inlet shape and cone length on the flow field and separation performance of the cyclone separator were studied respectively.The results show that the separation efficiency of cyclone separator is highest when the connecting pipe diameter d=130 mm.As the diameter of the cyclone separator s connecting pipe increases,the cut particle size gradually increases.The cyclone separator with a circular A-shaped inlet has the highest separation efficiency.As the aspect ratio of the rectangle increases,the separation efficiency decreases and the cut particle size increases.An increase in the cone length initially enhances the cyclone separator s separation efficiency,which then declines,with the highest separation efficiency observed in scheme 3,and a gradual decrease in the cut particle size.
作者
宁壮壮
王晓峰
侯国明
赵航
NING Zhuangzhuang;WANG Xiaofeng;HOU Guoming;ZHAO Hang(College of Mechanical and Electrical Engineering,Shaanxi University of Science and Technology,Xi an 710021,China)
出处
《机电工程》
CAS
北大核心
2023年第10期1599-1606,共8页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(52174320)
西安市重点产业链核心技术攻关项目(2022JH-ZCZC-0056)。
关键词
化工机械与设备
金属增材制造
数值模拟计算
切向速度
分离效率
入口形状
锥体长度
chemical machinery and equipment
metal additive manufacturing
numerical simulation
tangential velocity
separation efficiency
inlet shape
cone length
