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An experimental evaluation of slots versus porous strips for laminar-flow applicationsDetailed mean velocity and disturbance amplitude measurements were conducted in a Blasius boundary-layer flow with wall suction applied at three downstream locations. The main emphasis was a direct comparison of the growth rate of the instability wave with discrete spanwise slots versus wide porous strips. The results demonstrate that the local effects of suction through slots or very narrow porous strips have a greater beneficial effect on the stability of the boundary-layer flow relative to the suction influence of a wide porous strip. Codes which use continuous suction for the growth rates of the instability waves to determine the suction quantities for a multiple series of slots will be quite conservative in the estimation of the suction quantity. Guidelines were provided for suction-chamber design and flow rates to minimize internal oscillations which propagate into the boundary-layer flow.
Document ID
19900003214
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cornelius, Kenneth C. (Lockheed-Georgia Co. Marietta, GA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1987
Publication Information
Publication: NASA, Langley Research Center, Research in Natural Laminar Flow and Laminar-Flow Control, Part 2
Subject Category
Aerodynamics
Accession Number
90N12530
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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