26th Congress of International Council of the Aeronautical Sciences
including the 8th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference
14 - 19 September 2008, Anchorage, Alaska, USA
Paper ICAS 2008-3.10.2

ACTIVE CANCELLATION OF TOLLMIEN-SCHLICHTING INSTABILITIES UP TO M = 0.40

M. Engert, W. Nitsche
T U Berlin, Germany

Keywords: active control, laminar flow control, Tollmien-Schlichting waves, compressible flows, sensor-actuator systems

This paper reports on active attenuation of natural Tollmien-Schlichting instabilities in compressible flows. The principle applied delays transition by using the stabilizing effect of a direct adaptive interaction with the linear disturbance waves initiating the laminar-turbulent transition process. This active wave cancellation method is based on the wave superposition principle.

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