Two-Dimensional Ablation, Thermal Response, and Sizing Program for Pyrolyzing Ablators

摘要

The purpose of this paper is to describe and demonstrate new capabilities in the two-dimensional implicit thermalnresponse and ablation program. These expanded capabilities include grid options for flight and arcjet geometries,na sizing algorithm for the flight-type geometry, and an orthotropic thermal conductivity model. Applications tonanalysis of an orthotropic low-density carbon-phenolic material in arcjet and flight environments relevant to thenOrion crew module are presented. For the arcjet environment, multidimensional conduction effects stronglyninfluence the in-depth thermal response. For a lunar return flight environment, in the shoulder region of the crewnmodule (where the radius of curvature is smallest), the thermal response is influenced by multidimensionalnconduction and by the orientation of the orthotropic material.