Aerodynamic Heating and Thermal Protection Systems by L. S. Fletcher

By L. S. Fletcher

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The injection rate at which the radiative blockage reaches a maximum can be substantially less than the coupled mass injection rate, as is shown for the coupled solution at 18 sec. 0% blockage of radiative flux to the wall as compared with the 28% blockage for a comparable blowing rate where the downstream influence was not accounted for. Figure 20 presents downstream coupled results for the large probe at 18 sec. The radiative and convective heatingrate distributions are compared with the corresponding noinjection values.

3 (90-10 atm, approximate analysis). 4 0 -4 10 Fig. 44 X1'01525 1 ID'3 1 1 ID'2 Stagnation radiative cooling correlation for a 90-10 atm (approximate analysis ) . 1 17 AEROTHERMAL ENVIRONMENT corresponds to the location where a thermocouple •will "be installed on each of the three small probes as part of the heatshield experiment. The nonablating results show that the laminar convective heating is generally greater than the radiative heating, with the difference between the convective and the radiative values becoming more pronounced with decreasing entry angle.

19 also show that, for most of the radiative heating pulse, the radiative blockage due to carbonphenolic injection reaches a maximum value for a very small mass injection rate and then remains approximately constant as the injection rate is increased. The injection rate at which the radiative blockage reaches a maximum can be substantially less than the coupled mass injection rate, as is shown for the coupled solution at 18 sec. 0% blockage of radiative flux to the wall as compared with the 28% blockage for a comparable blowing rate where the downstream influence was not accounted for.

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