SPECULATIVE CONSIDERATION ON HIGH-FREQUENCY INSTABILITY OF THE LAMINAR BOUNDARY LAYER AND ITS EFFECT ON THE DESIGN OF STABILIZING COATINGS
Abstract
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 1/8 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1962
- Accession Number
- AD0294703
Entities
People
- M. O. Kramer
Organizations
- RAND Corporation