GASEOUS RADIATION IN HYPERSONIC STAGNATION POINT FLOW
ADVANCED RESEARCH PROJECTS AGENCY ARLINGTON VA
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Contribution of radiation to heat transfer rates measured in shock tube flows is determined. Direct measurements of total radiation at the stagnation point of the model are made to determine if radiation is indeed contributing significantly. The results of such measurements are used to predict the radiative heating of actual re-entry bodies. This can be done for equilibrium flow, when the actual temperatures and densities are duplicated in the shock tube, and the body geometry and size are the prime considerations in scaling the model results. Thus, reasonable predictions of radiation to the actual vehicle can be made. On the other hand, where the shock tube flow is not in equilibrium at the stagnation point, scaling of the results is difficult if not impossible. Limits are determined of the shock tube test parameters pressure, temperature, Mach number which define flow regimes where data can be applied directly to problems of re-entry.
- Theoretical Mathematics