Investigation of nanosecond pulse dielectric barrier discharges in still air and in transonic flow by optical methods

Peschke, Philip; Goekce, Sami; Leyland, Pénélope; Ott, Peter

doi:10.1088/0022-3727/49/2/025204

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…In the first pulse, the reduction of time lag may be due to the reduced static pressure in the discharge space. According to previous work, [ 67 ] the static pressure and pd generally decrease with rising airflow velocity, which leads to the decrease of breakdown voltage according to Paschen law. Therefore, the time lag decreases as the airflow velocity increases in the first pulse period.…”

Section: Resultsmentioning

confidence: 91%

Effect of airflow on the discharge uniformity at different cycles in the repetitive unipolar nanosecond‐pulsed dielectric barrier discharge

Wang,

Yan,

Bai

et al. 2023

Plasma Processes & Polymers

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This study explores the discharge uniformity at different cycles under different airflow velocities in nanosecond‐pulsed dielectric barrier discharge. Based on a proper choice of the airflow velocity and discharge parameters, diffuse discharges can be maintained at an air gap of 5–7 mm. At higher airflow velocities, the discharge may transition to a complex mode, in which the diffuse and filamentary regions are maintained simultaneously. When the discharge is operated at a higher frequency, higher voltage, or smaller gas gap, the area of diffuse discharge can be expanded to a certain extent. The discharge characteristics indicate that airflow lowers the gas temperature and modulates the preionization degree, which induces the generation of a diffuse discharge for a properly adjusted airflow velocity.

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Section: Resultsmentioning

confidence: 91%

Effect of airflow on the discharge uniformity at different cycles in the repetitive unipolar nanosecond‐pulsed dielectric barrier discharge

Wang,

Yan,

Bai

et al. 2023

Plasma Processes & Polymers

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“…As a result, the maximum magnitude of the current pulse decreases. Second, the static pressure generally decreases with increasing airflow velocity, 60,61 resulting in decreased breakdown voltage. Since low breakdown voltage facilitates the formation of discharge channels, the number of current pulses increases in flowing air.…”

Section: Electrical and Optical Propertiesmentioning

confidence: 99%

Combined influence of airflows and a parallel magnetic field on the discharge characteristics of AC dielectric barrier discharge

Wang,

Yan,

et al. 2023

AIP Advances

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The combined influence of airflows and a parallel magnetic field on an AC-driven dielectric barrier discharge plasma is experimentally investigated through image analyses, electrical measurements, and optical diagnoses. After applying a parallel magnetic field, more discharge filaments are generated during one discharge cycle. Besides, the electrical and optical diagnoses show that the magnetic field can increase the plasma parameters, such as the electron temperature and electron density. When airflows and a parallel magnetic field are applied in combination, the discharge uniformity presented in the long-exposure images is significantly enhanced by the airflows and slightly improved by the magnetic field. With increasing airflow velocity, the distribution of discharge filaments goes through four phases, namely, spot-like distribution, line-like distribution, cotton-like distribution, and stripe-like distribution, among which the stripe-like distribution exhibits the highest discharge uniformity. High-speed video analyses reveal that the improved discharge uniformity can be attributed to the changed breakdown positions and the increased number of filaments. Although airflow can significantly improve the macroscopic uniformity of the discharge, it leads to a decrease in the maximum current pulse amplitude, electron temperature, electron density, and gas temperature. Applying a magnetic field in flowing air can not only improve the discharge uniformity but also ensure that the discharge has high maximum current pulse amplitude intensity, electron temperature, and electron density. Based on the analyses of the electron trajectory and the estimation of the force condition of the micro-discharge remnants, the modulated charged particles, reduced electric field, and pre-ionization degree are responsible for the changed discharge uniformity and plasma parameters in the parallel magnetic field and flowing air.

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“…Nishihara et al [19] showed that placing the pulsed discharge on a surface of a model caused a Mach 5 bow shock displacement and increased the shock stand-off distance. On the contrary, Peschke et al [20] observed no significant effect of the pulsed DBD on a shock wave in a transonic flow; the authors explained it by the unfavourable flow conditions and pointed out the importance of the actuator's placement.…”

Section: Introductionmentioning

confidence: 98%

“…More recently, there has been a considerable increase in publications on plasma actuators operating in a pulsed energy deposition mode, which are believed to provide better performance in high-speed flow control applications [13][14][15][16][17][18][19][20]. Moreover, for the surface energy deposition, pulsed or pulsedperiodic nanosecond discharge excitation is shown to be advantageous compared to the AC sinusoidal voltage regime in terms of efficiency and power consumption [21].…”

Section: Introductionmentioning

confidence: 99%

Shock wave interaction with a thermal layer produced by a plasma sheet actuator

Koroteeva¹,

Znamenskaya²,

Orlov³

et al. 2017

J. Phys. D: Appl. Phys.

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This paper explores the phenomena associated with pulsed discharge energy deposition in the near-surface gas layer in front of a shock wave from the flow control perspective. The energy is deposited in 200 ns by a high-current distributed sliding discharge of a ‘plasma sheet’ type. The discharge, covering an area of mm2, is mounted on the top or bottom wall of a shock tube channel. In order to analyse the time scales of the pulsed discharge effect on an unsteady supersonic flow, we consider the propagation of a planar shock wave along the discharge surface area 50–500 μs after the discharge pulse. The processes in the discharge chamber are visualized experimentally using the shadowgraph method and modelled numerically using 2D/3D CFD simulations. The interaction between the planar shock wave and the discharge-induced thermal layer results in the formation of a lambda-shock configuration and the generation of vorticity in the flow behind the shock front. We determine the amount and spatial distribution of the electric energy rapidly transforming into heat by comparing the calculated flow patterns and the experimental shadow images. It is shown that the uniformity of the discharge energy distribution strongly affects the resulting flow dynamics. Regions of turbulent mixing in the near-surface gas are detected when the discharge energy is deposited non-uniformly along the plasma sheet. They account for the increase in the cooling rate of the discharge-induced thermal layer and significantly influence its interaction with an incident shock wave.

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Investigation of nanosecond pulse dielectric barrier discharges in still air and in transonic flow by optical methods

Cited by 9 publications

References 21 publications

Effect of airflow on the discharge uniformity at different cycles in the repetitive unipolar nanosecond‐pulsed dielectric barrier discharge

Effect of airflow on the discharge uniformity at different cycles in the repetitive unipolar nanosecond‐pulsed dielectric barrier discharge

Combined influence of airflows and a parallel magnetic field on the discharge characteristics of AC dielectric barrier discharge

Shock wave interaction with a thermal layer produced by a plasma sheet actuator

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