A comparative study of Ac-dielectric barrier discharge versus Ns-dielectric barrier discharge plasma actuators in an incompressible turbulent mixing layer

Singh, Ashish; Little, Jesse

doi:10.1088/1361-6463/ab6e98

Cited by 15 publications

(12 citation statements)

References 35 publications

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“…Based on the above review, it becomes evident that the characteristic timescale of discharge waveform strongly impacts the output of DBD actuators (thermal perturbation or momentum addition), as well as their potential applications [13][14][15]. However, up to present, the scaling laws between the discharge timescale and the strength of the induced body force/thermal perturbation remain unknown, and none of the existing plasma actuators are capable of producing momentum and rapid heating effects simultaneously.…”

mentioning

confidence: 99%

Effect of pulse width on the characteristics of a dielectric barrier discharge plasma actuator driven by high-voltage pulses

Su¹,

Zong²,

Liang³

et al. 2021

J. Phys. D: Appl. Phys.

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In this study, high-voltage pulses are used to drive dielectric barrier discharge plasma actuators (DBDAs) for flow control purposes. The rising/falling edges of the pulse are kept nearly constant in nanosecond timescale, while the pulse width is varied from nanosecond to microsecond timescale. The impact of pulse width on the characteristics of the DBDA is investigated experimentally with a high-speed schlieren system and a high-fidelity force balance. In the case of small pulse width, a pressure wave propagating at the local speed of sound is produced each time at discharge ignition, and a vertical jet plume is induced after multiple discharge pulses due to heat accumulation (buoyancy effect). As a comparison, for cases with large pulse widths, two pressure waves are created sequentially with a time lag close to the pulse width, and a starting vortex followed by a near-wall jet is produced, demonstrating that significant momentum similar to that of DBD driven by sinusoidal high voltage has been imparted to the near-wall flow. A proportional increase of the induced body force with the cube root of the pulse width is demonstrated, while the pulse energy decreases nonlinearly as the pulse width increases. The maximum body force of 2.49 mN m−1 is reached at a pulse width of 380 μs.

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mentioning

confidence: 99%

Effect of pulse width on the characteristics of a dielectric barrier discharge plasma actuator driven by high-voltage pulses

Su¹,

Zong²,

Liang³

et al. 2021

J. Phys. D: Appl. Phys.

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“…The effect of plasma ns-SDBD actuators on turbulent shear layers (both in the case of a conventional mixing layer and a flow near a wall with a backward step) was experimentally studied in the series of works [183][184][185][186][187]. The objective of these works was to give an idea of the fundamental processes in the control of the mixing layer of a submerged jet by means of thermal perturbations.…”

Section: Control Of Mixing Layers and High-speed Jet Noisementioning

confidence: 99%

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Starikovskiy

Aleksandrov

2021

Plasma Phys. Rep.

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Abstract— The paper presents a review of modern works on gasdynamic flow control using a highly nonequilibrium pulsed plasma. The main attention is paid to the effects based on ultrafast (on the nanosecond time scale for atmospheric pressure) local gas heating, since, at present, the main successes in controlling high-speed flows by means of gas discharges are associated with this thermal mechanism. Attention is paid to the physical mechanisms responsible for the interaction of the discharge with gas flows. The first part of the review outlines the most popular approaches for pulsed energy deposition in plasma aerodynamics: nanosecond surface barrier discharges, pulsed spark discharges, and femto- and nanosecond optical discharges. The mechanisms of ultrafast heating of air at high electric fields realized in these discharges, as well as during the decay of the discharge plasma, are analyzed separately. The second part of the review gives numerous examples of plasma-assisted control of gasdynamic flows. It considers control of the configuration of shock waves in front of a supersonic object, control of its trajectory, control of quasi-stationary separated flows and layers, control of a laminar–turbulent transition, and control of static and dynamic separation of the boundary layer at high angles of attack, as well as issues of the operation of plasma actuators in different weather conditions and the use of plasma for the de-icing of a flying object.

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“…In the second operation mode of DBD, high voltage is applied in the form of repetitive pulses, usually wide in nanoseconds, and ranges between a few hundred Hz to a few hundred kHz. Singh and Little 23 performed a comparative investigation of momentum-based plasma actuation by AC-DBD with thermal perturbations produced by nanosecond pulsed discharge. The authors conclude that the AC-DBD plasma actuator showed more effective flow control over the mixing layer compared to the nanosecond DBD plasma actuator.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that DBD plasma actuators impact the fluid flow field by a body force produced by the excited and charged particles in the plasma zone due to a strongly reduced electric field. In the past, a few studies 3,4,23 investigated the mixing effects of plasma discharge; however, the flow vortexes and structures were not studied in detail. Therefore, the features of this development are not fully understood due to the limitations of both experimental and numerical studies.…”

Section: Introductionmentioning

confidence: 99%

Identification of flow structures in a closed chamber in the presence of a needle plasma actuator

2022

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This study deals with the experimental characterization of the induced flow dynamics by a disk-needle type plasma actuator driven by sinusoidal generator and located in a rectangular cross-section burner. Flow characterization was performed using different plasma actuation conditions and standoff distances. Experiments were conducted under non-reactive flow conditions. An electrical characterization was carried out. Airflow behaviour was also analyzed using smoke flow visualization. Smoke flow visualization showed the dynamic behavior of the plasma induced flow . Post-processing of high-quality images was performed by using Proper Orthogonal Decomposition (POD) technique to recognize the dominant flow vortexes and coherent structures. This could help to design the plasma actuation in real combustors as well as could be useful for the implementation of numerical models. Moreover, it has been concluded that flow dynamics can be controlled by a variation of the plasma power or of the gap distance between two electrodes. Laser Doppler Velocimetry (LDV) was used to investigate the distribution of flow velocities and turbulent kinetic energy at different plasma power values of the sinusoidal AC generator and standoff distances. From POD and LDV analyses, it has been observed that there is a quite linear relation between POD energy of the first mode and the maximum turbulent kinetic energy (TKE). The proper orthogonal decomposition (POD) method could be used to identify motions in the flow field carrying the most turbulent kinetic energy (TKE). TKE peaks are present in the area with the most energetic flow structures, as identified by the POD.

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A comparative study of Ac-dielectric barrier discharge versus Ns-dielectric barrier discharge plasma actuators in an incompressible turbulent mixing layer

Cited by 15 publications

References 35 publications

Effect of pulse width on the characteristics of a dielectric barrier discharge plasma actuator driven by high-voltage pulses

Effect of pulse width on the characteristics of a dielectric barrier discharge plasma actuator driven by high-voltage pulses

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Identification of flow structures in a closed chamber in the presence of a needle plasma actuator

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