# Experimental closed-loop control of flow separation over a plain flap using slope seeking

Experimental closed-loop control of flow separation over a plain flap using slope seeking Slope seeking control is implemented to suppress flow separation occurring on a plain flap progressively deflected at $$Re_{\mathrm{c}}=2\times 10^{6}$$ R e c = 2 × 10 6 . The flap is equipped with pulsed blowing slots that are actuated by a square signal whose duty cycle is adapted by the so-called slope seeking algorithm in order to minimise the injected momentum while maintaining the flow attached whatever the flap deflection angle. Thirteen hot-film sensors are chordwise distributed on the flap. They measure the wall shear stress fluctuations that are used to calculate in real time a series of correlation coefficients. This method constitutes a way to determine whether the flow is separated or not within the context of flow separation control. Finally, a modification of basic slope seeking algorithm is proposed to improve its convergence rate without compromising stability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

# Experimental closed-loop control of flow separation over a plain flap using slope seeking

, Volume 55 (8) – Aug 1, 2014
19 pages

/lp/springer_journal/experimental-closed-loop-control-of-flow-separation-over-a-plain-flap-UPLZFdkS4Q
Publisher
Springer Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-014-1797-2
Publisher site
See Article on Publisher Site

### Abstract

Slope seeking control is implemented to suppress flow separation occurring on a plain flap progressively deflected at $$Re_{\mathrm{c}}=2\times 10^{6}$$ R e c = 2 × 10 6 . The flap is equipped with pulsed blowing slots that are actuated by a square signal whose duty cycle is adapted by the so-called slope seeking algorithm in order to minimise the injected momentum while maintaining the flow attached whatever the flap deflection angle. Thirteen hot-film sensors are chordwise distributed on the flap. They measure the wall shear stress fluctuations that are used to calculate in real time a series of correlation coefficients. This method constitutes a way to determine whether the flow is separated or not within the context of flow separation control. Finally, a modification of basic slope seeking algorithm is proposed to improve its convergence rate without compromising stability.

### Journal

Experiments in FluidsSpringer Journals

Published: Aug 1, 2014

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