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Reconstruction of Emission Coefficients for a Non-axisymmetric Coupling Arc Based on MALDONADO's Method

Chinese Journal of Mechanical Engineering 2012年第4期25卷 781-785页

作者： XIONG Jun ZHANG Guangjun HU Yutang WU Lin State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

The reconstruction of emission coefficient is a key factor for the calculation of temperature ***,most of the researches for determining arc plasmas are based on axisymmetric sources,little has been done to study non-axisymmetric arc *** order to reveal temperatures of a non-axisymmetric coupling arc,the distribution of emission coefficients must be reconstructed in *** this paper,the argon atomic line intensities of the coupling arc are obtained by using the imaging system that involves a high speed camera in conjunction with a neutral and a narrow-band *** converted programme between emission coefficients and emitted intensities is programmed based on MALDONADO＇s method.A displaced Gaussian model is used for evaluating the validity of the converted ***,the emission coefficients of a free burning arc are reconstructed by MALDONADO＇s method and an Abel inversion,respectively,and good agreement is ***,the emission coefficient profiles of the coupling arc are *** results show that the distribution of emission coefficient for the coupling arc is *** emission coefficient profile is similar to an ellipse,and the short axis of the ellipse is in the direction that the two electrodes are arranged *** peak temperature of the coupling arc is in the middle of both *** is a strong interaction between both arcs within the coupling *** proposed research solves difficulties for determining asymmetric arcs and enlarges the application scope of spectroscopic techniques.

关键词： non-axisymmetric coupling arc emission coefficient twin-electrode tig spectroscopy image

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