caa a22 4500 606198504 CHVBK 20210128100934.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00348-015-2032-5 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2032-5 A rapidly settled closed-loop control for airfoil aerodynamics based on plasma actuation [Elektronische Daten] [Z. Wu, C. Wong, L. Wang, Z. Lu, Y. Zhu, Y. Zhou] 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 $$C_{{{\text{L}}_{ \text{max} } }}$$ C L 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 $$C_{{{\text{L}}_{ \text{max} } }}$$ C L 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. Springer-Verlag Berlin Heidelberg, 2015 Wu Z. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut Wong C. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut Wang L. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut Lu Z. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut Zhu Y. CSIRO Manufacturing Flagship, Private Bag 10, 3169, Clayton South, VIC, Australia aut Zhou Y. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-15 0723-4864 56:8<1 2015 56 348 https://doi.org/10.1007/s00348-015-2032-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2032-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Z. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut NATIONALLICENCE 700 1- Wong C. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut NATIONALLICENCE 700 1- Wang L. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut NATIONALLICENCE 700 1- Lu Z. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut NATIONALLICENCE 700 1- Zhu Y. CSIRO Manufacturing Flagship, Private Bag 10, 3169, Clayton South, VIC, Australia aut NATIONALLICENCE 700 1- Zhou Y. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, 518055, Shenzhen, China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-15 0723-4864 56:8<1 2015 56 348