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Feed-forward control in an experimental channel flow

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Feed-forward control of natural disturbances in a plane channel flow at Re = 840 is considered. The experimental facility consists of air flow through an open return channel. Two hot-film sensors are placed at the wall and a blowing and suction device is used for the actuation. In a first step, the flow dynamics between input and output devices is identified using a least squares technique based on a Finite Impulse Response (FIR) model. This identified model then forms the basis for the design of a feed-forward controller. When applied to the channel flow, the measurement signal at the downstream objective sensor could be reduced, in its standard deviation, by 45%.

Author(s):

Fabien JUILLET    
Laboratoire d'Hydrodynamique de L'Ecole Polytechnique (LadHyX)
France

Beverley McKeon    
GALCIT, Caltech
United States

Peter Schmid    
Laboratoire d'Hydrodynamique de L'Ecole Polytechnique (LadHyX)
France