Transport properties of carbon-phenolic gas mixtures

Abstract

The development of a new generation of ablative thermal protection systems based on carbon-phenolic composite materials demands the accurate determination of transport properties of pyrolysis gases mixed in various atmospheres. The present work provides recommended collision data for the calculation of the transport properties for Mars and Earth re-entries. A review of available potential data is given for species in the atmospheres of Earth and Mars. Additional data are provided for species formed during the degradation of the theoretical ablative composite for open testing material. Dipole polarizabilities are calculated from ab initio methods and used for the calculation of transport properties of reduced pyrolysis mixtures over a temperature range representative of the boundary layer for atmospheric entry flows.

High-Temperature Collision Integrals for m-6-8 and Hulburt–Hirschfelder Potentials

“…The most basic and the most widely used is the Lennard-Jones (12-6) potential energy function, for which high-accuracy data are available for comparison [14]. Due to its simplicity, scattering data based on this potential and its modification are still in commonly used [19,20].…”

State-of-the-Art on Advancements in Carbon–Phenolic and Carbon–Elastomeric Ablatives

“…These advancements herald a new era of carbon-phenolic ablatives. During re-entry to Earth, air-pyrolysis gas mixtures are produced, while CO 2 -pyrolysis gas mixes are generated during re-entry to Mars [ 29 ].…”