Loading...
Please wait, while we are loading the content...
Similar Documents
Surface-cooling effects on compressible boundary-layer instability
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bowles, R. I. Seddougui, Sharon O. Smith, F. T. |
| Copyright Year | 1990 |
| Description | The influence of surface cooling on compressible boundary layer instability is discussed theoretically for both viscous and inviscid modes, at high Reynolds numbers. The cooling enhances the surface heat transfer and shear stress, creating a high heat transfer sublayer. This has the effect of distorting and accentuating the viscous Tollmien-Schlichting modes to such an extent that their spatial growth rates become comparable with, and can even exceed, the growth rates of inviscid modes, including those found previously. This is for moderate cooling, and it applies at any Mach number. In addition, the moderate cooling destabilizes otherwise stable viscous or inviscid modes, in particular triggering outward-traveling waves at the edge of the boundary layer in the supersonic regime. Severe cooling is also discussed as it brings compressible dynamics directly into play within the viscous sublayer. All the new cooled modes found involve the heat transfer sublayer quite actively, and they are often multi-structured in form and may be distinct from those observed in previous computational and experimental investigations. The corresponding nonlinear processes are also pointed out with regard to transition in the cooled compressible boundary layer. Finally, comparisons with Lysenko and Maslov's (1984) experiments on surface cooling are presented. |
| File Size | 1754113 |
| Page Count | 54 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900011974 |
| Archival Resource Key | ark:/13960/t86h9g32j |
| Language | English |
| Publisher Date | 1990-02-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer High Reynolds Number Compressible Boundary Layer Distortion Substrates Surface Cooling Tollmien-schlichting Waves Shear Stress Inviscid Flow Nonlinearity Boundary Layer Transition Heat Transfer Mach Number Boundary Layer Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
