Accession Number:

ADA478648

Title:

Understanding Micro-Ramp Control for Shock Boundary Layer Interactions

Descriptive Note:

Final technical rept. 1 Jun 2006-30 Nov 2007

Corporate Author:

ILLINOIS UNIV URBANA DEPT OF AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

2008-02-07

Pagination or Media Count:

29.0

Abstract:

Micro-vortex generators micro-VGs have the ability to alter the near-wall structure of compressible turbulent boundary layers in such a way that the flow becomes significantly less susceptible to separations and more stable to unsteady disturbances. Due to their extremely small size, micro-VGs are embedded in the boundary layer and may provide reduced viscous drag when compared to traditional vortex generators. Of several candidate micro-VGs, micro-ramps have been found to significantly impact shock boundary layer interaction flows, while being cost-effective, physically robust, and requiring no power sources. Thus detailed study of flow interactions with micro-ramps on a supersonic boundary layer at M3.0 was investigated using monotone integrated Large Eddy Simulations MILES and Reynolds Averaged Navier-Stokes RANS. A rescale-recycle method was used to efficiently generate turbulent in-flow conditions. Studies showed that the vortical structure generated from the micro-ramp flows through the separation region caused by the impinging shock, which helped to reduce the area of separation.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE