The Hypersonic International Flight Research Experimentation program is a hypersonic flight test program. It successfully measured the three-dimensional transition front on a cone at angle of attack in hypersonic flight during its reentry. The test article consisted of a nonablating, 7 deg half-angle, axisymmetric cone with a small bluntness of 2.5 mm radius. During transition, angle of attack dropped from 13 to 5 deg and freestream unit Reynolds number increased from 2 × 10 6 to 8 × 10 6 / m . Mach number during this time was approximately seven. Earliest transition, determined from fluctuating pressures, occurred on the leeward meridian, at R e x = 3.1 × 10 6 , α = 13 deg , and M = 7 . Attachment line transition occurred at R e x = 4.7 × 10 6 , α = 9 deg , and M = 7 . The latest transition occurred off the windward meridian at R e x = 6.0 × 10 6 and Φ = 30 and 280 deg. Transition occurred at lower Reynolds numbers than the α = 0 deg transition measured during ascent ( R e x = 11 × 10 6 at M = 5.2 ). The azimuthally averaged transition Reynolds number determined from thermocouples was R e x = 4.9 × 10 6 . Away from the windward meridian, wind-tunnel transition occurred at lower Reynolds numbers than in flight. However, the decrement in transition Reynolds number due to wind-tunnel noise was not as severe as at zero angle of attack. Wind-tunnel windward transition occurred at a higher Reynolds number than in flight. It is posited that the destabilizing effects of wall cooling, which was higher in flight ( T w / T 0 = 0.18 ) than in ground test ( T w / T 0 = 0.56 ), outweighed the effect of wind-tunnel noise on the windward transition. High-bandwidth instrumentation recorded periodic pressure fluctuations approximately midway between the windward and leeward meridians before transition. However, they could not be positively identified as a crossflow instability.


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    Title :

    Boundary-Layer Transition Experiment During Reentry of HIFiRE-1


    Contributors:

    Published in:

    Publication date :

    2015-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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