Numerical Modeling of the High-Intensity Transferred Arc with a Water-Cooled Constrictor Tube  

作　　者：王海兴 陈熙 

机构地区：[1]Department of Engineering Mechanics, Tsinghua University

出　　处：《Plasma Science and Technology》2005年第5期3051-3056,共6页等离子体科学和技术（英文版）

基　　金：The project supported by National Natural Science Foundation of China (Nos. 50336010, 10405015, 10575127) and the ChinesePostdoctoral Science Foundation (No. 20040350044)

摘　　要：Stable and axi-symmetrical DC high-intensity transferred arcs with a coaxial water-cooled constrictor tube have been used to study the arc characteristics for many years. All the previous modeling studies concerning the high-intensity transferred arcs were restricted to the near-anode region. Modeling results are presented in this paper concerning the characteristics of the whole high-intensity transferred arc, referring to a recent experiment. It is shown that the computed flow and temperature fields for different flow rates of the working gas are overall similar, but a fully developed flow regime can only be achieved in the water-cooled constrictor tube at low working-gas flow rates. The predicted radial profiles of plasma temperature at the cross section near the constrictor-tube exit compare favorably with available experimental data, but corresponding comparison about the plasma axial-velocity profiles shows appreciable difference, revealing that there may exist considerable errors in the plasma velocity measurements using a sweeping Pitot tube.Stable and axi-symmetrical DC high-intensity transferred arcs with a coaxial water-cooled constrictor tube have been used to study the arc characteristics for many years. All the previous modeling studies concerning the high-intensity transferred arcs were restricted to the near-anode region. Modeling results are presented in this paper concerning the characteristics of the whole high-intensity transferred arc, referring to a recent experiment. It is shown that the computed flow and temperature fields for different flow rates of the working gas are overall similar, but a fully developed flow regime can only be achieved in the water-cooled constrictor tube at low working-gas flow rates. The predicted radial profiles of plasma temperature at the cross section near the constrictor-tube exit compare favorably with available experimental data, but corresponding comparison about the plasma axial-velocity profiles shows appreciable difference, revealing that there may exist considerable errors in the plasma velocity measurements using a sweeping Pitot tube.

关 键 词：DC transferred arc plasma flow and heat transfer modeling 

分 类 号：TB852.1[一般工业技术—摄影技术]