HF DBD plasma actuators for reduction of cylinder noise in flow

Kopiev, V. F.; Kazansky, Pavel; Moralev, I. A.; Zaytsev, M. Yu.

doi:10.1088/1361-6463/aa91aa

Cited by 18 publications

(8 citation statements)

References 42 publications

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“…The wake width and turbulence levels behind the cylinder were both reduced in the contraflow (backward) configuration compared to the uncontrolled flow. These findings in the work by the authors of [102] seem to contrast the flow behavior in the earlier study by the authors of [101], both with contraflow configuration, but this is debatable as investigators employed different measurement techniques.…”

Section: Effect Of Actuator Configurationcontrasting

confidence: 64%

Active Control of Bluff-Body Flows Using Plasma Actuators

Konstantinidis

2019

Actuators

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Actuators play an important role in modern active flow control technology. Dielectric barrier discharge plasma can be used to induce localized velocity perturbations in air, so as to accomplish modifications to the global flow field. This paper presents a selective review of applications from the published literature with emphasis on interactions between plasma-induced perturbations and original unsteady fields of bluff-body flows. First, dielectric barrier discharge (DBD)-plasma actuator characteristics, and the local disturbance fields these actuators induce into the exterior flow, are described. Then, instabilities found in separated flows around bluff bodies that controlled actuation should target at are briefly presented. Key parameters for effective control are introduced using the nominally two-dimensional flow around a circular cylinder as a paradigm. The effects of the actuator configuration and location, amplitude and frequency of excitation, input waveform, as well as the phase difference between individual actuators are illustrated through examples classified based on symmetry properties. In general, symmetric excitation at frequencies higher than approximately five times the uncontrolled frequency of vortex shedding acts destructively on regular vortex shedding and can be safely employed for reducing the mean drag and lift fluctuations. Antisymmetric and symmetric excitation at low frequencies of the order of the natural frequency can amplify the wake instability and increase the mean and fluctuating aerodynamic forces, respectively, due to vortex locking-on to the excitation frequency or its subharmonics. Results from several studies show that the geometry and arrangement of the electrodes is of utmost significance. Power consumption is typically very low, but the electromechanical efficiency can be optimized by input waveform modulation.

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Section: Effect Of Actuator Configurationcontrasting

confidence: 64%

Active Control of Bluff-Body Flows Using Plasma Actuators

Konstantinidis

2019

Actuators

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“…Being attached on the surface, the actuators are able to locally reduce drag and delay the airflow laminar-turbulent transition [15,24,25]. The flow laminarization leads to the broadband reduction of the aerodynamic noise [26,27].…”

Section: Introductionmentioning

confidence: 99%

Development of a plasma electroacoustic actuator for active noise control applications

Sergeev

Lissek

Howling

et al. 2020

J. Phys. D: Appl. Phys.

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Conventional loudspeakers generate sound through the vibration of a diaphragm, attached to a rigid frame through elastic suspensions. Although such construction is satisfactory for sound diffusion in steady environments, it is likely to fail in harsh conditions, which is often the case for active noise control applications. Plasma-based actuators appear to be a promising alternative since they do not involve any fragile moving parts. In this paper, a positive corona discharge actuator in a wire-to-mesh geometry is proposed in the perspective of active noise control applications, as it is capable of generating sufficient sound pressure levels with limited signal distortion. The study introduces analytical and numerical models aiming at characterizing the sound field generated by the corona discharge actuator. The numerical simulation can facilitate the designing of such transducers. The acoustic power of the experimental prototype is increased through the optimization of emitter wires arrangement. The comparison of analytical model and numerical simulation with the experiment is presented. The analytical model successively describes the low frequency sound pressure field, while the numerical simulation is valid in the broader frequency range.

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“…However, according to our knowledge, only the work of Sari and Mureithi [38] has tried to control VIV by plasma actuation. On the contrary, in the aeroacoustic field, different authors proposed these devices to control the aerodynamic noise in geometries like cylinders [42,26,30], cavity flows [25] or flat plates [1].…”

Section: Introductionmentioning

confidence: 99%