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SPECULATIVE CONSIDERATION ON HIGH-FREQUENCY INSTABILITY OF THE LAMINAR BOUNDARY LAYER AND ITS EFFECT ON THE DESIGN OF STABILIZING COATINGS
RAND CORP SANTA MONICA CA
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Recent theoretical work indicates the possibility of a high-frequency instability of the laminar boundary layer. Recent experimental findings provide evidence for the existence of a high-frequency instability of the laminar boundary layer. The critical frequency of the experimentally indicated high-frequency instability is approximately 40 of the freestream velocity divided by the laminar-boundarylayer thickness or about 25 times the most critical frequency of the Tollmien-Schlichting waves. The wave length of the high-frequency instability is about 1.9 times the laminarboundary-layer thickness or approximately 18 the wave length of the most critical TollmienSchlichting waves. The eddies resulting from the high-frequency instability are spaced much closer to the surface than to each other, which makes the damping of the high-frequency instability of the laminar boundary layer by an appropriate stabilizing coating a promising possibility. Author
APPROVED FOR PUBLIC RELEASE