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Large eddy breakup devices as low Reynolds number airfoilsTurbulent drag reduction downstream of large-eddy breakup (LEBU) devices is analyzed from the viewpoint of low-Reynolds number airfoil aerodynamics. It is argued that the variability of results between different research labs is primarily due to low Reynolds number 'phenomena' associated with unsteady separation/transition of the LEBU device boundary layer. LEBU drag reduction is shown to be an extremely sensitive function of device microgeometry at the low Reynolds numbers of all current investigations, and by analogy with conventional low-Reynolds number airfoil testing, the conclusion is drawn that the full potential for LEBU drag reduction must be explored at chord Reynolds numbers of 300,000 and above.
Document ID
19870045355
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Anders, John B.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Subject Category
Aerodynamics
Report/Patent Number
SAE PAPER 861769
Accession Number
87A32629
Distribution Limits
Public
Copyright
Other

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