The use of plasma actuators for bluff body broadband noise control

Li, Yong; Zhang, Xin; Huang, Xun

doi:10.1007/s00348-009-0806-3

Cited by 76 publications

(44 citation statements)

References 25 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.…”

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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“…The purpose of the actuators is to reduce or eliminate flow separation [9], reduce turbulent drag [10] and/or reduce noise [11]. Low-pressure turbines (LPTs) in particular are exposed to flow separation due to increased blade loading.…”

Section: Active Methodsmentioning

confidence: 99%

“…Plasma actuators have also shown potential in jet mixing [40], lift augmentation of air vehicle wings [32,34], suppressing vortex shedding over blunt bodies [29,37], suppressing endwall secondary flows in compressor cascades [38], reducing noise [11], and heat transfer augmentation [70]. Benard et al [32] presented a parameterisation of the plasma actuator controller, but this discussion is beyond the topic of this review.…”

Section: Refmentioning

confidence: 99%

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Tiainen

Grönman

Jaatinen-Värri

et al. 2017

IJTPP

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Abstract:The decrease in the performance of centrifugal compressors operating at low Reynolds numbers (e.g., unmanned aerial vehicles at high altitudes or small turbomachines) can reach 10% due to increased friction. The purposes of this review are to represent the state-of-the-art of the active and passive flow control methods used to improve performance and/or widen the operating range in numerous engineering applications, and to investigate their applicability in low-Reynolds-number centrifugal compressors. The applicable method should increase performance by reducing drag, increasing blade loading, or reducing tip leakage. Based on the aerodynamic and structural demands, passive methods like riblets, squealers, winglets and grooves could be beneficial; however, the drawbacks of these approaches are that their performance depends on the operating conditions and the effect might be negative at higher Reynolds numbers. The flow control method, which would reduce the boundary layer thickness and reduce wake, could have a beneficial impact on the performance of a low-Reynolds-number compressor in the entire operating range, but none of the methods represented in this review fully fulfil this objective.

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“…Conversely, they have quite low efficiency of energy conversion. Generally, plasma DBD actuators which are powered by alternating current, are used to control in steady regime when instantaneous ionic wind (wall-jet like flow) is produced [3,4,5]. There is also an unsteady regime [6] which occurs after that rectangular modulation is applied.…”

Section: Introductionmentioning

confidence: 99%

Stereoscopic PIV measurement of boundary layer affected by DBD actuator

Procházka

Uruba

2016

EPJ Web of Conferences

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Abstract. The effect of ionic wind generated by plasma actuator on developed boundary layer inside a narrow channel was investigated recently. Since the main investigated plane was parallel to the channel axis, the description of flow field was not evaluated credibly. This paper is dealing with cross-section planes downstream the actuator measured via 3D time-resolved PIV. The actuator position is in spanwise or in streamwise orientation so that ionic wind is blown in the same direction as the main flow or in opposite direction or perpendicularly. The interaction between boundary layer and ionic wind is evaluated for three different velocities of main flow and several parameters of plasma actuation (steady and unsteady regime, frequency etc.). Statistical properties of the flow are shown as well as dynamical behaviour of arising longitudinal vortices are discussed via phase-locked measurement and decomposition method.

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The use of plasma actuators for bluff body broadband noise control

Cited by 76 publications

References 25 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

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Stereoscopic PIV measurement of boundary layer affected by DBD actuator

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