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boundary layer flow control by an array of ramp-shaped vortex generatorsFlow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control. The data files can be found on a supplemental CD.
Document ID
20120009374
Document Type
Technical Memorandum (TM)
Authors
Zaman, K. B. M. Q.
(NASA Glenn Research Center Cleveland, OH, United States)
Hirt, S. M.
(NASA Glenn Research Center Cleveland, OH, United States)
Bencic, T. J.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
April 1, 2012
Subject Category
Aerodynamics
Report/Patent Number
E-18130
NASA/TM-2012-217437/SUPPL
Funding Number(s)
WBS: WBS 561581.02.08.03.47.06.03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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