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Active flow control of a two-dimensional compressible cavity flow using direct output feedback law

Airiau, Christophe Active flow control of a two-dimensional compressible cavity flow using direct output feedback law. (2013) .

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Abstract

Acoustic perturbations emitted from a two dimensional compressible cavity flow are analysed and controlled using direct numerical simulations (DNS) and an output feedback law which expresses the actuation (a synthetic jet) velocity as a function of wall pressure fluctuation sensors. To get the feedback control law, a non-linear reduced-order model (ROM) is first built from un-actuated flow fields and flow forced with a large frequency bandwidth actuation. The control law is then determined by a Linear Quadratic Regulator algorithm. The control law implemented in the DNS provides a significant and global noise reduction (up to 10 dB). The actuation law remains efficient for long times, greater than the temporal window of observation used to design the ROM. Actuation of moderate amplitudes generate some non-linear effects but perturbations continue to be damped.

Item Type:Other
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:08 Jan 2014 12:46

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