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 ∞, covering the chord Reynolds number Re from 4.4 × 104 to 7.7 × 104. 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 × 104. The sawtooth plasma actuator led to a delay in the stall angle α stall by 5° and an increase in the maximum lift coefficient \(C_{{{\text{L}}_{ \text{max} } }}\) by about 9 %. On the other hand, at the same input power, the traditional DBD plasma actuator managed a delay in α stall by only 3° and an increase in \(C_{{{\text{L}}_{ \text{max} } }}\) by about 3 %. Secondly, the convergence time t c of the lift force F L at Re from 4.4 × 104 to 7.7 × 104 was investigated for two closed-loop systems. It has been demonstrated that the t c 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 × 104. The reduction in t c 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 conventional slope seeking with HP and LP filters.
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Acknowledgments
CW Wong wishes to acknowledge support given to him from Research Grants Council of Shenzhen Government through grants JCYJ20120613153244545 and JCYJ20130402100505796. Y Zhou wishes to acknowledge the financial support of CSIRO Chief Executive Office through the Distinguished Visiting Scientist program.
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Wu, Z., Wong, C.W., Wang, L. et al. A rapidly settled closed-loop control for airfoil aerodynamics based on plasma actuation. Exp Fluids 56, 158 (2015). https://doi.org/10.1007/s00348-015-2032-5
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DOI: https://doi.org/10.1007/s00348-015-2032-5