Materialdependent catalytic recombination modeling for hypersonic flows
Abstract
A new model to predict catalytic recombination rates of O, N atoms over silica reentry TPS is reported. The model follows the general approach of Halpern and Rosner, but adds estimates of some key physical mechanism parameters based on realistic surface potentials. This novel feature can therefore produce rate expressions for any surface for which structure is known. Testing the model for N over W, and N, O over SiO2 produces recombination probabilities in good agreement with published measurements at high surface temperature. Applying the model to a high temperature flat plate flow shows, with respect to the noncatalytic case, a 30 percent increase in total heat transfer, significant surface NO production due to O, N cross recombination and minor differences in velocity and temperature profiles.
 Publication:

AIAA, 28th Thermophysics Conference
 Pub Date:
 July 1993
 Bibcode:
 1993thph.confS....N
 Keywords:

 Catalysis;
 Heat Shielding;
 Hypersonic Flow;
 Reaction Kinetics;
 Recombination Reactions;
 Computational Fluid Dynamics;
 Flat Plates;
 Heat Transfer;
 Mathematical Models;
 Silicon Dioxide;
 Fluid Mechanics and Heat Transfer