HYPERSONIC BOUNDARY LAYER TRANSITION EXPERIMENTS- HYPERSONIC INTERNATIONAL FLIGHT RESEARCH EXPERIMENTATION 5 (HIFIRE-5) AND CIRCULAR CONE
Technical Report,01 Apr 2015,13 Jun 2016
Hypersonic Sciences Branch Wright-Patterson Air Force Base United States
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This interim technical report summarizes activity on AFRL 6.1 laboratory task LRIR 15RQCOR102 during fiscal year 2016. The objective of this task is to better understand boundary layer transition in hypersonic flow fields with spanwise nonuniformity. Several advances were made under this task during FY16. Quantitative simultaneous infrared thermography and fluctuating pressure measurements on the HIFiRE-5 configuration were made in a quiet flow wind tunnel. These measurements quantified the growth and structure of traveling cross flow instabilities and provided high-sensitivity thermal imaging for heat transfer measurements of transition. Benchmark experiments on blunt-cone transition carried out in the 1980s have been reanalyzed using modern computational methods. This analysis shows that transition behavior on cones with small bluntness is consistent with second-mode transition behavior, but cones with higher bluntness do exhibit either first or second-mode transition behavior. Finally, multi-point FLDI and high-speed schlieren imaging have been demonstrated for measuring wind tunnel disturbance spectra and convection velocities.
- Fluid Mechanics