The Effect of Pressure Gradients on Transition Zone Length in Hypersonic Boundary Layers

[+] Author and Article Information
R. L. Kimmel

Aeromechanics Division, 2645 Fifth St Ste 7, Wright Laboratory, Wright Patterson Air Force Base, OH 45433-7913

J. Fluids Eng 119(1), 36-41 (Mar 01, 1997) (6 pages) doi:10.1115/1.2819115 History: Received July 01, 1996; Revised July 22, 1996; Online December 04, 2007


Boundary layer transition was measured in zero, favorable, and adverse pressure gradients at Mach 8 using heat transfer. Models consisted of 7° half angle forecones 0.4826 m long, followed by flared or ogive aft bodies 0.5334 m long. The flares and ogives produced constant pressure gradients. For the cases examined, favorable pressure gradients delay transition and adverse pressure gradients promote transition, but transition zone lengths are shorter in favorable pressure gradient. Results of the effect of adverse pressure gradient on transition zone lengths were inconclusive.

Copyright © 1997 by The American Society of Mechanical Engineers
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