Feedback Stabilization Hydrodynamic Instabilities
Final rept. 1 Aug 1989-31 Jul 1991,
CAMBRIDGE UNIV (UNITED KINGDOM) DEPT OF ENGINEERING
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The, stabilization of boundary layers via control compared to passive boundary layer control techniques. To date, all experimental disturbances in the laminar boundary layer. To further improve the level of disturbance attenuation in the boundary layer requires an inherently three dimensional approach. The goal of this study was to control the boundary layer response to random three dimensional disturbances introduced near the leading edge of a flat plate. This goal was not fully achieved in the shortened time frame of this investigation. The basic flow structure to be controlled is the three-dimensional wave packet, i.e. the boundary later response to localized pulse excitation. Since the control is to take place in the linear region of the transition zone, any conceivable flow disturbance can be synthesized and hence cancelled by appropriate wave packet superposition.
- Fluid Mechanics