Abstract
The results of an experimental investigation conducted in a shock tube on the interaction of a reflected normal shock front with a two-dimensional highly heated thin gaseous filament are reported. The heated gaseous filament was created at a predetermined time either by exploding a fine gauge copper wire or by an arc discharge between two thin needle electrodes in the drift flow of the incident shock wave. The transient interaction phenomena were recorded systematically by spark interferometric and schlieren techniques. These data revealed that; (a) A cylindrical band of acoustic waves centered on the transmitted (interacted) heated filament is generated behind the reflected shock front. On the basis of the analysis of the interferometric data, the leading acoustic wave front was found to have an alternate compression-rarefaction type of density distribution along its circumference. (b) Owing to its passage through the heated filament, the reflected normal shock becomes distorted. (c) The interacted heated gaseous filament split into two vortexlike flow regions.
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