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

Becker, Ralf; King, Rudibert; Petz, Ralf; Nitsche, W.

doi:10.2514/6.2006-3493

Cited by 52 publications

(33 citation statements)

References 10 publications

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“…C L,max is found around 12° for all Re, although the value of C L,max is dependent on Re as expected (Figure 7). This is most apparent by considering the change in performance between Re = 0.25x10 6 and 1.15x10 6 at α = 12-13°, where the low-Re behavior is most certainly caused by laminar boundary layer separation. The range of C L,max between all Re considered is 1.0-1.1.…”

Section: A Baseline Resultsmentioning

confidence: 99%

“…2 Active flow control is also well-suited for use with feedback controllers, and the successful integration of these technologies has been demonstrated in various aerodynamic systems. [3][4][5][6][7][8][9] The periodic excitation used for active flow control is often generated using oscillatory momentum devices that produce zero-net mass flux. 10 Momentum can be introduced by a variety of techniques, but the most common ones are piezoelectric, electromagnetic and electrostatic.…”

mentioning

confidence: 99%

“…However, several of the challenges typically associated with DBD plasma actuators have been overcome. The most important of these is the demonstration of control authority at Re >10 6 and M > 0.2. Many remaining challenges are currently being addressed.…”

mentioning

confidence: 99%

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Flow Separation Control over an Airfoil with Nanosecond Pulse Driven DBD Plasma Actuators

Rethmel

Little

Takashima

et al. 2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This work continues an ongoing development and use of dielectric barrier discharge (DBD) plasma actuators driven by repetitive nanosecond pulses for high Reynolds number aerodynamic flow control. These actuators are believed to influence the flow via a thermal mechanism which is fundamentally different from the more commonly studied AC-DBD plasmas. Leading edge separation control on an 8-inch chord NACA 0015 airfoil is demonstrated at various post-stall angles of attack (α) for Reynolds numbers (Re) and Mach numbers (M) up to 1.15x10 6 and 0.26 respectively (free stream velocity, U ∞ = 93 m/s). The nanosecond pulse driven DBD can extend the stall angle at low Re by functioning as an active trip. At poststall α, the device generates coherent spanwise vortices that transfer momentum from the freestream to the separated region, thus reattaching the flow. This is observed for all Re and M spanning the speed range of the subsonic tunnel used in this work. The actuator is also integrated into a feedback control system with a stagnation-line-sensing hot film on the airfoil pressure side. A simple on/off type controller that operates based on a threshold of the mean value of the power dissipated by the hot film is developed for this system. A preliminary extremum seeking controller is also investigated for dynamically varying Re. Several challenges typically associated with integration of DBD plasma actuators into a feedback control system have been overcome. The most important of these is the demonstration of control authority at realistic takeoff and landing Re and M. Nomenclature c = model chord, 20.32 cm C L = sectional lift coefficient

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Section: A Baseline Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Flow Separation Control over an Airfoil with Nanosecond Pulse Driven DBD Plasma Actuators

Rethmel

Little

Takashima

et al. 2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…They observed that the system works around its optimal state of lower energy consumption by using this algorithm. Becker and King (2006) controlled the separation on a high-lift configuration by using extremum seeking control.…”

Section: Control Of Vortex Shedding By Electrical Methods (Ehd)mentioning

confidence: 99%

Vortex shedding suppression and wake control: A review

2016

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Wake destructive behavior and vortex shedding behind bluff bodies may be controlled by use of active and passive methods. Computational fluid dynamics, experimental and analytical techniques have been utilized to study this problem. In this survey, existing studies on different methods of controlling the wake destructive behavior and suppression of vortex shedding behind bluff bodies are discussed, including the very recent developments. These methods are classified into two groups. In the first group, these methods are discussed according to the type of external source or modification of the geometry of bluff body for controlling the flow. In the second group, the methods are classified according to the part of the flow, boundary layer or wake, that is modified by the method. Advantages, limitations, energy efficiency, and particular applications of each method are discussed and summarized, followed by some conclusions and recommendations. Moreover, the effectiveness of each technique on the drag reduction is discussed.

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“…This algorithm is a non-model based and the parameters can be varied according to our requirements. Some of these results were widely used in [7], [8], [9], [10], [11] and some designs were also shown in [2], [12]. But none of them shows interest on improving the transient response except [13].…”

Section: Introductionmentioning

confidence: 99%

Control of Wind Energy Conversion System and Power Quality Improvement in the Sub Rated Region Using Extremum Seeking

Ganesh¹,

Anupama²,

Kumar³

2016

IJEEI

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For the purpose of better utilization and to have control over varying wind speeds we use variable speed wind turbines. The performance mainly depends on the system operating point. In this paper we implement extremum seeking (ES) which is a non-model based approach for maximum power extraction in the region between cut-in speed and rated speed. The convergence of the system depends mainly on the system dynamics so we go for non-linear control based on field oriented approach and also feedback linearization. For achieving maximum power at all wind speeds the outer loop of ES is used to tune the turbine speed in the sub rated region. By adjusting the voltage magnitude and electrical frequency through matrix converter we can achieve a fast transient response. The transient response can be improved by providing inner loop control based on field oriented control. Through this we can avoid magnetic saturation in the induction generator.

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

Cited by 52 publications

References 10 publications

Flow Separation Control over an Airfoil with Nanosecond Pulse Driven DBD Plasma Actuators

Flow Separation Control over an Airfoil with Nanosecond Pulse Driven DBD Plasma Actuators

Vortex shedding suppression and wake control: A review

Control of Wind Energy Conversion System and Power Quality Improvement in the Sub Rated Region Using Extremum Seeking

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