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Delay of Transition Using Forced DampingSeveral experiments which have reported a delay of transition are analyzed in terms of the frequencies of the induced disturbances generated by different flow control elements. Two of the experiments employed passive stabilizers in the boundary layer, one leading-edge bluntness, and one employed an active spark discharge in the boundary layer. It is found that the frequencies generated by the various elements lie in the damping region of the associated stability curve. It is concluded that the creation of strong disturbances in the damping region stabilizes the boundary-layer and delays the transition from laminar to turbulent flow.
Document ID
20150000597
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Exton, Reginald J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
January 16, 2015
Publication Date
November 1, 2014
Subject Category
Aerodynamics
Report/Patent Number
L-20496
NASA/TM-2014-218551
NF1676L-20143
Funding Number(s)
WBS: WBS 305295.01.40.07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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