A rapidly settled closed-loop control for airfoil aerodynamics based on plasma actuation

Wu, Z, Wong, C, Wang, L, Lu, Z, Zhu, Y and Zhou, Y 2015, 'A rapidly settled closed-loop control for airfoil aerodynamics based on plasma actuation', Experiments in Fluids, vol. 56, no. 8, pp. 1-15.


Document type: Journal Article
Collection: Journal Articles

Title A rapidly settled closed-loop control for airfoil aerodynamics based on plasma actuation
Author(s) Wu, Z
Wong, C
Wang, L
Lu, Z
Zhu, Y
Zhou, Y
Year 2015
Journal name Experiments in Fluids
Volume number 56
Issue number 8
Start page 1
End page 15
Total pages 15
Publisher Springer
Abstract This paper presents an experimental investigation on the response of the slope seeking with extended Kalman filter (EKF) deployed in a closed-loop system for airfoil aerodynamics control. A novel dielectric barrier discharge (DBD) plasma actuator was used to manipulate the flow around the NACA 0015 airfoil. Experiments were performed under different freestream velocities U < inf > ∞ < /inf > , covering the chord Reynolds number Re from 4.4 × 10 < sup > 4 < /sup > to 7.7 × 10 < sup > 4 < /sup > . Firstly, the advantages of applying this DBD plasma actuator (hereafter called sawtooth plasma actuator) on the airfoil were examined in an open-loop system at Re = 7.7 × 10 < sup > 4 < /sup > . The sawtooth plasma actuator led to a delay in the stall angle α < inf > stall < /inf > by 5° and an increase in the maximum lift coefficient $$C_{{{\text{L}}_{ \text{max} } }}$$CLmax by about 9 %. On the other hand, at the same input power, the traditional DBD plasma actuator managed a delay in α < inf > stall < /inf > by only 3° and an increase in $$C_{{{\text{L}}_{ \text{max} } }}$$CLmax by about 3 %. Secondly, the convergence time t < inf > c < /inf > of the lift force F < inf > L < /inf > at Re from 4.4 × 10 < sup > 4 < /sup > to 7.7 × 10 < sup > 4 < /sup > was investigated for two closed-loop systems. It has been demonstrated that the t < inf > c < /inf > was about 70 % less under the slope seeking with EKF than that under the conventional slope seeking with high-pass (HP) and low-pass (LP) filters at Re = 7.7 × 10 < sup > 4 < /sup > . The reduction in t < inf > c < /inf > was also observed at a different Re. Finally, the slope seeking with EKF showed excellent robustness over a moderate Re range; that is, the voltage amplitude determined by the control algorithm promptly responded to a change in Re, much faster than that of the conventio
Subject Biomedical Engineering not elsewhere classified
Keyword(s) Barrier Discharge Actuator
Active Flow-Control
Extremum Seeking
Separation Control
Slope-Seeking
DOI - identifier 10.1007/s00348-015-2032-5
Copyright notice © 2015, Springer-Verlag Berlin Heidelberg.
ISSN 0723-4864
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