Abstract
In order to investigate the characteristics of intense radiation around Si-based heat-resistant materials in air plasma freejets, radiation measurements were performed around ablating silicon carbide test piece in the air plasma freejets. In previous study, by using a spectrometer, characteristic continuum radiation, atomic Si lines, OH molecular bands, and CN molecular bands were observed in common. In this study, radiation measurements were spatially conducted with two kinds of band-pass filters corresponding to 520 and 650nm in wavelength and video cameras. It was found that the relative intensity distributions were different with each other, the intensity distribution corresponding to 650nm was higher than that to 520nm, and estimated temperature around ablating the test piece was about 2,600K at 7.0mm position from nozzle exit on flow axis.
