Passive Nosetip Technology (PANT) Program. Volume XIII. An Experimental Study to Evaluate Heat Transfer Rates to Scalloped Surfaces -Data Report.

摘要

Hypersonic wind tunnel tests conducted in the Naval Ordnance Laboratory Tunnel Number 8 are described. One calorimeter model which was an exact replica of a scalloped low-temperature-ablator nosetip model was tested at Mach 5, with a total temperature of 830 deg R and freestream unit Reynolds numbers from 2 million to 21 million per ft. Measured heat transfer rates are 1.5 to 2.3 times corresponding smooth wall turbulent predictions. Heating data agree nominally with heat transfer rates inferred from the ablation test results. It is conjectured that scallops increase surface heating through effects on the shock layer flow.