Gas Permeability of Oblique-Layered Carbon-Cloth Ablator

摘要

In this study, the gas permeability of carbon-cloth ablator developed in TSAS is determined experimentally. The measured permeability varies for more than three orders of magnitude as the char volume varies from 0.3 to 1.0. The dependence of gas permeability on ply angle of the carbon cloth is also examined. The permeability for the case of 90-deg ply angle is about three times larger than that for the case of 0-deg ply angle. It is also shown that the variation of the measured permeability in terms of ply angle can be fitted fairly well with the curve determined by Eq. (4). In the study of delam-ination problem, thermal response of ablative test piece should be solved at least in two-dimensional space. The dependence of gas permeability on ply angle that is measured in this study will be used in such studies.