材料科学与工程学报2013，Vol.31Issue(1)：96-100,121,6.
等离子喷枪内电弧动力学与等离子体特性的三维数值模拟
Three Dimensional Numerical Modeling of Arc Dynamics and Plasma Characteristics in a Plasma Torch
叶向艺 1郑振环 1李强1
作者信息
- 1. 福州大学材料科学与工程学院,福建福州 350116
- 折叠
摘要
Abstract
A three-dimensional, transient, turbulent, local thermodynamic equilibrium (LTE) model of plasma arc was proposed in order to study the arc dynamics and plasma characteristics in a plasma torch. Computational fluid dynamics software ANSYS CFX was adopted in this study. The research work mainly involved the anode arc root reattachment process, the arc and flow interaction inside the argon-hydrogen plasma torch and plasma temperature and velocity distributions predictions. The results show that as the arc is dragged downstream by the cold incoming gas, the arc length increases and the arc voltage and the local electric field strength increase. When the local electric field strength is high enough, the arc breakdowns and a new arc root is formed. The arc voltage fluctuation lead to the fluctuations of maximum plasma temperature and velocity at the torch exit and the lagged time is about 10μs. The plasma flow and heat transfer inside the plasma torch have strong three-dimensional effects. Compared with the temperature distribution, the plasma velocity distribution has stronger three-dimensional effect and is more concentrated into the center.关键词
等离子喷涂/三维模拟/非稳态模拟/电弧动力学/等离子体特性Key words
plasma spraying/ three-dimensional modeling/ transient modeling/ arc dynamics/ plasma characteristics分类
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叶向艺,郑振环,李强..等离子喷枪内电弧动力学与等离子体特性的三维数值模拟[J].材料科学与工程学报,2013,31(1):96-100,121,6.
