Abstract
The surface spectral radiance of ablating phenolic graphite was measured in the wavelength region between 0.3 and lO.Sju. The material was heated to its ablation temperature in an archeated subsonic air stream having an equilibrium temperature of approximately 5000°K. The magnitude and the slope of measured surface spectral radiance vs wavelength curve in the visible and near-infrared spectrum indicate the surface temperature to be 2500° d= 100°K. By comparing the measured surface spectral radiance with that calculated from Planck radiation law for a 2500°K blackbody, the spectral emissivity varies from 0.87 in the visible spectrum to 0.62 in the infrared. The spectral emissivity data show that the ablating phenolic graphite radiates nearly as a grey body in the visible and in the wavelength region of 3 to 10.5/z.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call