引用本文:郭辰光,郭昊,李强,岳海涛,王闯.同轴送粉工艺参数对激光增材再制造喷嘴粉流流场的影响规律[J].中国表面工程,2020,33(2):136~148
Guo Chenguang,Guo Hao,Li Qiang,Yue Haitao,Wang Chuang.Effects Law of Coaxial Powder Feeding Process Parameters on Flow Field of Laser Additive Remanufacturing Nozzle[J].China Surface Engineering,2020,33(2):136~148
【打印本页】   【HTML】   【下载PDF全文】   【查看/发表评论】  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被：浏览 1880次   下载 849次 本文二维码信息
码上扫一扫！
分享到： 微信 更多
字体:加大+|默认|缩小-
同轴送粉工艺参数对激光增材再制造喷嘴粉流流场的影响规律
郭辰光1,2, 郭昊1,2, 李强1, 岳海涛1, 王闯1
1.辽宁工程技术大学 机械工程学院, 阜新 123000;2.辽宁工程技术大学 辽宁省大型工矿装备重点实验室, 阜新 123000
摘要:
激光增材再制造同轴送粉喷嘴粉流汇聚特性是影响零件成形质量和成形效率的重要因素,基于 DEM-CFD 耦合方法,开展三维同轴送粉喷嘴粉-气流场仿真分析,依据表征粉流汇聚特性的喷嘴中心轴向粉流分布浓度、焦点距离、 上焦点截面粉流分布浓度和单位距离粉流分布浓度等参数,设计单因素试验,在喷嘴结构不变的条件下,分析输粉气流速度、送粉速率和中心光路保护气速度对粉流分布的影响规律。 结果表明:输粉气流速度越大,焦点距离越小,轴向粉流分布浓度越小,上焦点截面粉流浓度分布直径越小,单位距离粉流分布浓度越大,粉流的集聚性越好;中心光路保护气速度对粉流焦点浓度影响较小,保护气速度越大,焦点距离越大,上焦点截面粉流浓度分布直径越小,单位距离粉流分布浓度增加,粉流的集聚性越好;送粉速率对焦点距离影响较小,送粉速率越大,喷嘴轴向粉流分布浓度越大,上焦点截面粉流浓度分布直径越大,单位距离粉流分布浓度出现先增大后减小的趋势。
关键词:  激光增材再制造  同轴送粉喷嘴  离散单元法-计算流体力学 (DEM-CFD)  粉流分布
DOI：10.11933/j.issn.1007-9289.20191024001
分类号:TN249
文章编号:1007-9289(2020)02-0136-13
文献标识码:A
基金项目:辽宁省自然科学基金(20180550167)； 辽宁省教育厅重点攻关项目(LJ2019ZL005,LJ2017ZL001)； 辽宁省高水平创新团队国 (境)外培养项目(2018LNGXGJWPY-ZD001)
Effects Law of Coaxial Powder Feeding Process Parameters on Flow Field of Laser Additive Remanufacturing Nozzle
Guo Chenguang1,2, Guo Hao1,2, Li Qiang1, Yue Haitao1, Wang Chuang1
1.School of Mechanical Engineering, Liaoning Technical University, Fuxin 123000 , China;2.Liaoning Provincial Key Labo- ratory of Large-scale Industrial and Mining Equipment, Liaoning Technical University, Fuxin 123000 , China
Abstract:
Powder flow convergence of coaxial powder feeding nozzle was an important factor that affects the forming quality and efficiency in laser additive remanufacturing. The powder-gas flow field simulation analysis of coaxial powder feeding nozzle was carried out based on DEM-CFD coupling method. According to the parameters such as nozzle center axial powder flow dis- tribution concentration, focal distance, powder flow concentration distribution at upper focal section and concentration of pow- der flow per unit distance, a single-factor experiment was designed to analyze the influence of carrier gas flow, powder feeding rate and shielding gas velocity on the powder flow distribution under the nozzle structure remained unchanged. Results show that, with the increased of the carrier gas flow, the focal distance, nozzle center axial powder flow distribution concentration and diameter of powder flow concentration distribution at upper focal section decreases gradually, concentration of powder flow per unit distance increases, the powder flow convergence become excellent. The shielding gas velocity has few influence on thefocal concentration. The higher the shielding gas velocity is, the smaller the diameter of powder flow concentration distribution at upper focal section is, while the focal distance, concentration of powder flow per unit distance and the powder flow conver- gence become larger and better. The effect of powder feeding rate on the focal distance is not significant, with the increased of powder feeding rate, the nozzle center axial powder flow distribution concentration and the diameter of powder flow concentra- tion distribution at upper focal section also increase, concentration of the powder flow per unit distance increases first and then decreases.
Key words:  laser additive remanufacturing  coaxial powder feeding nozzle  Discrete element method-computational fluid dy- namics(DEM-CFD)  powder flow distribution
手机扫一扫看