Active Control of Laminar Boundary Layer Disturbances
Active suppression of the naturally occurring travelling wave disturbances that amplify in laminar boundary layers and cause the transition from laminar to turbulent flow is considered. Both open-loop and closed-loop schemes are discussed. Numerical predictions, based on linear stability theory, have been used to model the behaviour of the flow disturbances and the controlled waves. Predictions based on these models have shown that the instability waves that occur on a simple flat plate can be stabilized significantly by both types of control.Wind tunnel experiments have so far been used to validate some of the predictions in the open-loop case.
Key wordsControl boundary layer laminar transition instability
Unable to display preview. Download preview PDF.
- 1.Bushnell, D.M. and McGinley, C.B., 1989, Turbulence control in wall flows, Annual Review of Fluid Mechanics 21, 1–20.Google Scholar
- 2.Ho, C.M. and Tai, Y.C., 1998, Micro-electro-mechanical-systems (mems) and fluid flows, Annual Review of Fluid Mechanics 30, 597–612.Google Scholar
- 3.Gaster, M., 1987, Is the Dolphin a red herring?, in Proceedings of the IUTAM Symposium, Bangalore, India, Springer-Verlag.Google Scholar
- 4.Li, Y. and Gaster, M., 2006, Active control of boundary layer instabilities, Journal of Fluid Mechanics 550, 185–205.Google Scholar