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激光熔覆中同轴送粉气体-粉末流数值模拟
引用本文:董敢,刘继常,李媛媛. 激光熔覆中同轴送粉气体-粉末流数值模拟[J]. 强激光与粒子束, 2013, 25(8): 1951-1955. DOI: 10.3788/HPLPB20132508.1951
作者姓名:董敢  刘继常  李媛媛
作者单位:1.湖南大学 汽车车身先进设计制造国家重点实验室, 长沙 41 0082
摘    要:应用FLUENT软件的离散相模块建立了激光熔覆中气体 粉末流的二维模型,研究了保护气和输送气流量及送粉量对粉末流浓度场和速度场的分布规律的影响以及对粉末流发散角和焦点的影响。计算结果表明:随着输送气流量的增大,粉末流速度增加,粉末流发散角逐渐减小;送粉量增加,焦点略微下移,焦点处粉末流浓度值增大。在相同的工艺参数下,使用单反相机拍摄粉末流分布,结果表明试验与计算结果基本吻合。

关 键 词:激光熔覆   同轴送粉   气体-粉末流   数值模拟
收稿时间:2012-12-03;

Numerical simulation of gas powder flow in laser cladding with coaxial powder feeding
Dong Gan,Liu Jichang,Li Yuanyuan. Numerical simulation of gas powder flow in laser cladding with coaxial powder feeding[J]. High Power Laser and Particle Beams, 2013, 25(8): 1951-1955. DOI: 10.3788/HPLPB20132508.1951
Authors:Dong Gan  Liu Jichang  Li Yuanyuan
Affiliation:1.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China
Abstract:The discrete phase module in FLUENT is used to build the two-dimensional model of gas-powder flow. The impacts of the amounts of shielding gas, transporting gas and fed powder on the concentration field and velocity field distribution, divergence angle and the focus of powder flow are discussed. The calculated results show that with increase in transporting gas flux, the powder velocity increases and the gas-powder flow’s divergence angle decreases, and with increase in powder feed amount, the gas-powder flow’s focus moves down a little and the powder concentration at this focus increases. At the same values of the process parameters as in the calculation, the camera is used to take photos of the powder flow distribution. It is shown that the experimental results agree well with the computational results.
Keywords:coaxial powder feeding  gas-powder flow  numerical simulation
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