Boundary Layer Transition on Slender Cones in Conventional and Low Disturbance Mach 6 Wind Tunnels.pdfVIP

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Boundary Layer Transition on Slender Cones in Conventional and Low Disturbance Mach 6 Wind Tunnels.pdf

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Boundary Layer Transition on Slender Cones in Conventional and Low Disturbance Mach 6 Wind Tunnels

AIAA 2002-2743 Boundary Layer Transition On Slender Cones In Conventional And Low Disturbance Mach 6 Wind Tunnels Thomas J. Horvath, Scott A. Berry, Brian R. Hollis, Chau-Lyan Chang, and Bart A. Singer NASA Langley Research Center Hampton, VA 23681-2199 32nd AIAA Fluid Dynamics Conference and Exhibit June 24-27, 2002 St. Louis, Missouri For permission to copy or republish, contact the copyright owner named on the first page. For AIAA-held copyright, write to AIAA, Permissions Department, 1801 Alexander Bell Drive, Suite 500, Reston, VA 20191-4344. AIAA-2002-2743 BOUNDARY LAYER TRANSITION ON SLENDER CONES IN CONVENTIONAL AND LOW DISTURBANCE MACH 6 WIND TUNNELS Thomas J. Horvath*, Scott A. Berry*. Brian R. Hollis* Chau-Lyan Chang *+, and Bart A. Singer* NASA Langley Research Center Abstract An exlJeriuwntal investigation was conducted on a 5-degree ha!f angh cone and a 5-degree ha!lLangh .]lared cone in a conventional Math 6 wind tunnel to examine the efl_,cts o/facility mffse on houndary laver transition. The inJhwnce of tunnel m)ise was it!filTed by comparing transition onset locations dewrmined from the present test to thai previott.sly obtained in a Math 6 low disturbance quiet tunnel. Together, lilt two sets o.1 e.rperinunts tot believed to represenl the first direct comparison of transition onset between a conventional atul a low disturbance wind tunnel using a common lest model and transition detection technique. In the present conventional hypersonic tunnel experiment, separate measurements of heal tran.}fir aml adktbatic wall temperatures were obtained on the conical models at small angles of attack over a range of Reynolds munbers, which resulted in laminar, transitional, arm turbulent.[low. Smooth model turbulent heating dist)-ibutions are compared to that obtained with transition .]orced via discrele sluface roughness. The model nosetip radius was varied to examine tilt tJ[ects of bluntness on transition onset. Despite wall-to-total tenq_erature dilJerence