Slope-Seeking Control for Stall Mitigation of a NACA0015 Airfoil

  • Z. Wu
  • C. W. WongEmail author
  • L. Wang
  • Y. Zhou
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)


This paper aims to investigate 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) sawtooth plasma actuator is used to manipulate the flow around the NACA 0015 airfoil. The sawtooth plasma actuator leads to a delay in the stall angle by 5° and an increase in the maximum lift coefficient by about 9 %, appreciably better than that with the “traditional” DBD plasma actuator of the same input power. For the closed-loop control, the convergence time t c of the lift force F L is investigated for two control algorithms from Re = 4.4 × 104 to 7.7 × 104. The t c is about 70 % less under the slope seeking with EKF than that under the slope seeking with high-pass (HP) and low-pass (LP) filters at Re = 7.7 × 104. The slope seeking with EKF shows excellent robustness over a moderate Re range; that is, the voltage amplitude determined by the control algorithm promptly responds to a change in Re, much faster than that of the conventional slope seeking with HP and LP fliters.


Flow control Closed-loop control Slope seeking Plasma actuator 



CW WONG wishes to acknowledge support given to him from Research Grants Council of Shenzhen Government through grants JC201105160543A and JCYJ20130402100505796.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institute of Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate SchoolHarbin Institute of TechnologyHarbinChina

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