Generation of boundary layer instability waves by acoustic and vortical free-stream disturbances
Abstract
The receptivity mechanisms by which free-stream disturbances generate instability waves in laminar boundary layers are discussed. Free-stream disturbances have wavelengths which are generally much longer than those of instability waves. Hence, the transfer of energy from the free-stream disturbance to the instability wave requires a wavelength conversion mechanism. Recent analyses using asymptotic methods have shown that the wavelength conversion takes place in regions of the boundary layer where the mean flow adjusts on a short streamwise length scale. This paper reviews recent progress in the theoretical understanding of these phenomena.
- Publication:
-
Laminar-Turbulent Transition
- Pub Date:
- 1990
- Bibcode:
- 1990ltt..proc..477K
- Keywords:
-
- Asymptotic Methods;
- Boundary Layer Stability;
- Boundary Layer Transition;
- Energy Transfer;
- Laminar Boundary Layer;
- Blasius Flow;
- Leading Edges;
- Sound Waves;
- Three Dimensional Flow;
- Two Dimensional Boundary Layer;
- Fluid Mechanics and Heat Transfer