| 激光制造中同轴粉末流动量和质量传输 |
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| 引用本文： | 杨洗陈.激光制造中同轴粉末流动量和质量传输[J].中国激光,2008,35(11):1664-1679. |
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| 作者姓名： | 杨洗陈 |
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| 作者单位： | 天津工业大学激光技术研究所,天津,300160 |
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| 摘 要： | 激光制造同轴粉末/载流气体两相流中存在动量、质量和能量传输等物理过程,它们直接决定激光制造的质量和精度.重点报道国内外粉末流中动量和质量输运方面的综合研究结果:提出了激光同轴送粉二相流物理模型;根据气体/固体两相流理论建立了动量质量传输方程,开发了基于FLUENT的计算机模拟专用软件;建立了基于DPIV(Digital Particle Image Veloeimetry)的气体/金属粉末两相流的速度场和浓度场检测方法,开发了图像处理专用软件;完成了气体/金属粉末两相流的速度场和浓度场的数值模拟和试验检测.结果表明:理论模拟和试验检测结果基本一致.
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| 关 键 词： | 激光技术 同轴送粉熔覆 两相流 浓度场和速度场 数值模拟 CCD检测 图像处理 |
| 收稿时间： | 2008/9/8 |
Momentum and Mass Transferences of Coaxial Powder Stream in Laser Manufacturing |
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| Yang Xichen.Momentum and Mass Transferences of Coaxial Powder Stream in Laser Manufacturing[J].Chinese Journal of Lasers,2008,35(11):1664-1679. |
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| Authors: | Yang Xichen |
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| Abstract: | In carring gas/powder two phases flow from laser coaxial nozzle there are three main physical processings of energy,momentum and mass transferences,which directly affect the quality and accuracy of the parts by laser manufacturing.Comprehensive results reseached on momentum and mass transferences of the two phases flow have been reported: Physical model of the two phases flow from laser coaxial noozel is presented.A set of governing equations of mass and momentum conversation for each phase are established based on Euler theory for two-phase flow.FLUENT 6.0 software is developed to solve the momentum equation and continuity equations.DPIV(Digital Particle Image Velocimetry)with special image processing software is developed to measure concentration and velocity fields in the gas/powder stream.It is shown that there are good identical results between numerical simulation and DPIV measurement. |
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| Keywords: | laser technique coaxial powder cladding two phases flow concentration and velocity fields numerical simulation CCD camera image processing |
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