Adaptive Closed-Loop Separation Control on a High-Lift Configuration Using Extremum Seeking

Control of vortex shedding on two- and three-dimensional aerofoils

“…Benard et al [45] used the measured lift to adjust the voltage to a dielectric-barrier discharge actuator on a NACA0015 aerofoil to autonomously reattach the flow at different speeds, and for step changes to the operating conditions. Becker et al [46] implemented multiple-input, multiple-output, extremum-seeking control for spanwise distributed actuation and (pressure) sensing for pulsed-jet actuators on a flap, and were able to achieve higher lift than open-loop actuation, including lower angles of attack where the flow was not fully separated and where open-loop control showed little effect. Taira et al [47] also used extremum seeking to optimize actuation frequency in numerical simulations of three-dimensional aerofoils at low Re.…”

Large-Scale Separation Flow Control Experiments Within the German Flow Control Network

“…The tunnel was operated at Mach numbers between 0.05 and 0.2, corresponding Reynolds number range of 0.5-2.7 Mio. Most of the measurements were conducted at M=0.15 and Re=2.0x10 6 . Lift and moment coefficients were evaluated by surface pressure integration using the center section of pressure probes.…”

“…Active separation control using pulsed jets from the flap shoulder was introduced by Berlin Institute of Technology [6][7][8][9] . Compressed air, a fast switching solenoid valve and a specially designed actuator chamber are the three main components of one actuator segment.…”

Flow Control

“…Becker et al [2006] This method completely abandons modeling procedures and directly closes the loop. Control laws such as adaptive extremum seeking controllers vary open loop parameters to produce desired flow states.…”