APPROXIMATE NUMERICAL-CALCULATION METHOD FOR DERIVING AN ASYMMETRICALTEMPERATURE DISTRIBUTION IN A CROSS-SECTION OF A GAS-BLASTED ARC

A new calculation method for deriving an asymmetrical temperature dist ribution in a cross-section of an SF6-gas-blasted arc is proposed. Sid e-on profiles of radiation intensities of four S+-ion spectra observed from two directions perpendicular to each other are used as input dat a to determine asymmetrical distributions of emission coefficients in the cross-section. The emission coefficient distribution of each spect ral line is assumed to be represented by a product of three expression s: one corresponding to an elliptic component, the others being two po lynomials that give degree of asymmetry with respect to x- and y-direc tion, respectively. Unknown co-efficients in two polynomials are numer ically determined by an iteration process. From Boltzman plot diagram with respect to the emission coefficients of four S+-ion spectral line s for each spatial position, the asymmetrical temperature distribution of SF6-gas-blasted arc is estimated successfully.