Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying

被引：9

作者：

Bobzin K. ^{[1
]}

Bagcivan N. ^{[1
]}

Zhao L. ^{[1
]}

Petkovic I. ^{[1
]}

Schein J. ^{[2
]}

Hartz-Behrend K. ^{[2
]}

Kirner S. ^{[2
]}

Marqués J.-L. ^{[2
]}

Forster G. ^{[2
]}

机构：

[1] Surface Engineering Institute, RWTH Aachen University

[2] Institute of Plasma Technology and Mathematics, Universität der Bundeswehr München, Neubiberg

来源：

Frontiers of Mechanical Engineering | 2011年 / 6卷 / 3期

关键词：

computed tomography; electric arc; numerical simulation; plasma spraying; three-cathode plasma torch;

D O I：

10.1007/s11465-011-0125-2

中图分类号：

学科分类号：

摘要：

Usage of a multiple-arcs system has significantly improved process stability and coating properties in air plasma spraying. However, there are still demands on understanding and controlling the physical process to determine process conditions for reproducible coating quality and homogeneity of coating microstructure. The main goal of this work is the application of numerical simulation for the prediction of the temperature profiles at the torch outlet for real process conditions. Behaviour of the gas flow and electric arcs were described in a three-dimensional numerical model. The calculated results showed the characteristic triangular temperature distribution at the torch nozzle outlet caused by three electric arcs. These results were compared with experimentally determined temperature distributions, which were obtained with specially developed computed tomography equipment for reconstructing the emissivity and temperature distribution of the plasma jet close to the torch exit. The calculated results related to temperature values and contours were verified for the most process parameters with experimental ones. © 2011 Higher Education Press and Springer-Verlag Berlin Heidelberg.

引用

页码：324 / 331

页数：7

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