Stabilization of Hypersonic Boundary Layers by Porous Coatings
Abstract
A second-mode stability analysis has been performed for a hypersonic boundary layer on a wall covered by a porous coating with equally spaced cylindrical blind microholes. Massive reduction of the second mode amplification is found to be due to the disturbance energy absorption by the porous layer. This stabilization effect was demonstrated by experiments recently conducted on a sharp cone in the T-5 high-enthalpy wind tunnel of the Graduate Aeronautical Laboratories of the California Institute of Technology. Their experimental confirmation of the theoretical predictions underscores the possibility that ultrasonically absorptive porous coatings may be exploited for passive laminar flow control on hypersonic vehicle surfaces.
Additional Information
Copyright 2000 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 11 February 2000; revision received 28 August 2000; accepted for publication 3 October 2000; presented as Paper 2001-0891 at the AIAA 39th Aerospace Sciences Meeting, Reno, NV, 8–11 January 2001. Portions of this effort was supported by the Air Force Office of Scientific Research, Air Force Materials Command under Contracts F49620-92-C-0006, F49620-96-C-0004, and F499620-98-1-0353. The U.S. government is authorized to reproduce and distribute reprints for government purposes, notwithstanding any copyright notation thereon. The views and conclusions herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed, or implied by the Air Force Office of Research or the U.S. government.Attached Files
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Additional details
- Eprint ID
- 11252
- Resolver ID
- CaltechAUTHORS:FEDaiaaj01
- Air Force Office of Scientific Research
- F49620-92-C-0006
- Air Force Office of Scientific Research
- F49620-96-C-0004
- Air Force Office of Scientific Research
- F499620-98-1-0353
- Created
-
2008-07-28Created from EPrint's datestamp field
- Updated
-
2019-11-22Created from EPrint's last_modified field
- Caltech groups
- GALCIT