Stagnation Point Radiative Heat Transfer Measurements at Supersatellite Velocities

Total heat transfer measurements were made using standard calorimeter techniques in an electrically driven 6.5 inch diameter shock tube at stagnation point enthalpies corresponding to velocities of up to 47, 000 ft/sec in air at an altitude of 140,000 feet. The radiative component was separated from the total by subtracting the measured convective component from the total heat transfer rate measurement. The remaining radiative component is compared with the equilibrium radiative heat transfer theory of Kivel and Bailey and the nonequilibrium estimates of Teare, Geōōōrgiev, and Allen. The possible sources of error, the advantages and limitations of this technique and the discrepancy with theory is discussed in detail.