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LEBU drag reduction in high Reynolds number boundary layersConventional and inverted, outer-layer leading-edge breakup devices (LEBUs) were water tunnel tested on an axisymmetric body over the Re number range from 380,000 to 3.8 million. Test results indicate a sharp degradation of the LEBUs' drag-reduction mechanism with increasing Re number. The most likely result of this degradation is a decoupling of the inner and outer scales at higher Re numbers; due to this decoupling, the breakup of the large structures by outer-layer devices has minimal influence on the near-wall, shear-producing scales. This suggests that smaller devices, closer to the walls, may be required for operation at elevated Re numbers.
Document ID
19890043151
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Anders, J. B.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1989
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 89-1011
Accession Number
89A30522
Distribution Limits
Public
Copyright
Other

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