Fluctuations in Heat Flux as Observed in the Expanded Flow from the RENT (Re-Entry Nose Tip) Facility Arc Heater.
Technical rept. Oct 69-Oct 72,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO
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A large number of heat flux profiles from the test jet of the Re-Entry Nose Tip RENT Test Leg of the 50 MW Facility have been evaluated. These were obtained using null-point calorimeters. Only those profiles taken at fixed arc heater conditions of 1500 psig arc heater air pressure and 2600 amps arc current were used. The heat flux profiles showed that large fluctuations in heat flux were present in the test stream for all nozzles used. The main frequency of the fluctuations was found to be in the 100 Hz range. The fluctuations were approximately plus or minus 20 about the mean level. It is concluded that the average heat flux level determined from a minimum of ten profiles should be established for each arc heater operating condition. This value should then be used as input information for analysis of ablation behavior. Author
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