Active cancellation of artificially introduced Tollmien–Schlichting waves using plasma actuators

Grundmann, Sven; Tropea, Cameron

doi:10.1007/s00348-007-0436-6

Cited by 147 publications

(60 citation statements)

References 24 publications

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“…Several concepts and applications have been investigated ranging from separation control 1 to boundary layer control, 2,3 noise reduction 4 and laminar-turbulent transition delay. 5 Detailed reviews on the physics, modeling and applications of this type of actuators are available. 6,7 This study considers the dielectric barrier discharge (DBD) actuator (Fig.…”

Section: Introductionmentioning

confidence: 99%

Forcing mechanisms of dielectric barrier discharge plasma actuators at carrier frequency of 625 Hz

Kotsonis

Ghaemi

2011

Journal of Applied Physics

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The forcing behavior of a dielectric barrier discharge (DBD) actuator is investigated experimentally using a time-resolved particle image velocimetry (PIV) system in conjunction with a phase shifting technique. The spatio-temporal evolution of the induced flowfield is accurately captured within one high voltage (HV) cycle allowing the calculation of the instantaneous velocity and acceleration. Additional voltage and current measurements provide the power consumption for each case. Four different applied voltage waveform shapes are independently tested, namely, sine, square, positive sawtooth, and negative sawtooth at fixed applied voltage (10 kV pp ) and carrier frequency (625 Hz). The instantaneous flowfields reveal the effect of the plasma forcing during the HV cycle. Sine waveform provides large positive forcing during the forward stroke, with minimal but still positive forcing during the backward stroke. Square waveform provides strong and concentrated positive and negative forcing at the beginning of the forward and backward stroke, respectively. Positive sawtooth provides positive but weak forcing during both strokes while the negative sawtooth case produces observable forcing only during the forward stroke. Results indicate the inherent importance of negative ions on the force production mechanisms of DBD's. Furthermore, the revealed influence of the waveform shape on the force production can provide guidelines for the design of custom asymmetric waveforms for the improvement of the actuator's performance.

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Section: Introductionmentioning

confidence: 99%

Forcing mechanisms of dielectric barrier discharge plasma actuators at carrier frequency of 625 Hz

Kotsonis

Ghaemi

2011

Journal of Applied Physics

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“…Similar technique has already been investigated with the use of vibrating membranes as actuators. 21 In recent studies 22,23 artificially introduced TS waves were successfully cancelled using plasma actuators. These structures are typically unsteady and as such require unsteady actuation for optimal control.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on dielectric barrier discharge actuators operating in pulse mode

Kotsonis

Veldhuis

2010

Journal of Applied Physics

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An experimental investigation is performed on the operation of dielectric barrier discharge plasma actuators used as manipulators of secondary and unsteady flow structures such as boundary layer instabilities or shedding vortices. The actuators are tested mainly in pulse mode. High sample rate hot-wire measurements of the induced velocity field downstream of the actuator are taken for the cases of pulse actuation in still air as well as in a laminar boundary layer. Complementary voltage and current measurements are taken to calculate power consumption. Additionally, a study on the influence of the pulse frequency and duty cycle of actuation is performed. Results show the effectiveness of plasma actuators in inducing fluctuating components of velocity when operated in pulse mode. Spectral analysis reveals the connection between the actuator driving signal and the induced flowfield. The magnitude as well as the consistency of the resulting fluctuating field are dependent on both the duty cycle and the pulse frequency. An empirical operational envelope based on phenomenological observations is proposed, for the use of the actuators at specific flow and operational conditions given in the paper.

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“…In most of these papers, the actuator is used in context of open-loop control, but plasma discharges find a new route in the construction of closed-loop strategies by using DBD (Lombardi et al 2012;Rethmel et al 2011;Grundmann and Tropea 2008;Kriegseis et al 2011a). Instead of manipulating a flow dynamic, the actuator can be used as a generator of predefined perturbations easily tuned by the applied electrical signal (Widmann et al 2012).…”

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confidence: 99%

Electrical and mechanical characteristics of surface AC dielectric barrier discharge plasma actuators applied to airflow control

2014

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Sherman 1998). Then, different groups already having background experiences on corona discharges and their interactions with quiescent or moving flows formed a new highly motivated community that contributes to the dissemination of the advantages and relevancy of non-thermal plasma discharges as an alternative to conventional flow actuators (Moreau 2007;Corke et al. 2009Corke et al. , 2010. Rapidly, the number of publications in journals and conference exponentially grows to finally become a full interdisciplinary research field. The sudden interest for surface dielectric barrier discharge (DBD) energized by AC high voltage for manipulating airflows was initially motivated by the easy implementation of these actuators and a possible retrofitting on existing airfoils. They have the capability to be mounted at the surface of linear or curved objects with a minimal protrusion in the flow. Beside, their location can be changed faster than other active actuators that require a new model for each new position of actuation. The amplitude and frequency of the electrohydrodynamic (EHD) force produced by the surface plasma are directly connected to the driven electrical signal, this being a clear advantage for parametric studies on the sensibility of one flow to well-defined perturbations. Indeed, the EHD force (also referred as EFD force for electro-fluid dynamic) and the resulting produced flow called electric wind or ionic wind are due to electric field that acts on charged species. These charged species are produced by physical phenomena such as ionization, recombination, attachment, detachment and photoionization, which occur at timescale of a few picoseconds (Boeuf et al. 2009a). Subsequently, the produced body force, despite being low-pass filtered by fluid mechanical laws (viscosity, energy exchanges, dissipation) to produce electric wind, has a high bandwidth. Plasma actuators, and more specifically dielectric barrier discharge actuators, have demonstrated their authority to Abstract The present paper is a wide review on AC surface dielectric barrier discharge (DBD) actuators applied to airflow control. Both electrical and mechanical characteristics of surface DBD are presented and discussed. The first half of the present paper gives the last results concerning typical single plate-to-plate surface DBDs supplied by a sine high voltage. The discharge current, the plasma extension and its morphology are firstly analyzed. Then, time-averaged and time-resolved measurements of the produced electrohydrodynamic force and of the resulting electric wind are commented. The second half of the paper concerns a partial list of approaches having demonstrated a significant modification in the discharge behavior and an increasing of its mechanical performances. Typically, single DBDs can produce mean force and electric wind velocity up to 1 mN/W and 7 m/s, respectively. With multi-DBD designs, velocity up to 11 m/s has been measured and force up to 350 mN/m.

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Active cancellation of artificially introduced Tollmien–Schlichting waves using plasma actuators

Cited by 147 publications

References 24 publications

Forcing mechanisms of dielectric barrier discharge plasma actuators at carrier frequency of 625 Hz

Forcing mechanisms of dielectric barrier discharge plasma actuators at carrier frequency of 625 Hz

Experimental study on dielectric barrier discharge actuators operating in pulse mode

Electrical and mechanical characteristics of surface AC dielectric barrier discharge plasma actuators applied to airflow control

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