Nanosecond surface dielectric barrier discharge in atmospheric pressure air: I. measurements and 2D modeling of morphology, propagation and hydrodynamic perturbations

Zhu, Yifei; Shcherbanev, Sergey; Baron, B.; Starikovskaia, Svetlana

doi:10.1088/1361-6595/aa9304

Cited by 84 publications

(129 citation statements)

References 54 publications

(130 reference statements)

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“…Here, j ey , j py are the wall-normal (y) component of current density of electrons and positive ions respectively, and γ is the secondary electron emission coefficient, which is set to γ = 0.05 in the present study. Note that we have also carried out numerical tests using two other boundary conditions: 1) the boundary condition described in Zhu et al, 20 i.e., a combination of zero gradient of flux for flow towards boundary and zero flux for flow away from boundary; 2) zero-diffusion flux for both flows towards and away from boundary. In both cases, secondary electron emission is added as described above.…”

Section: B Computational Domain and Boundary Conditionsmentioning

confidence: 99%

“…In order to understand the discharge process and obtain the spatial and temporal distribution of generated body force and heat, experimental and numerical studies on SDBD plasma actuators have extensively been conducted. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Experimental results show that the dielectric barrier discharge consists of numerous micro-discharges with a short duration of some 10 ns. The discharge patterns on the dielectric surface depend on the polarity of the applied voltage.…”

Section: Introductionmentioning

confidence: 99%

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Influence of grid resolution in fluid-model simulation of nanosecond dielectric barrier discharge plasma actuator

Hua

Fukagata

2018

AIP Advances

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Two-dimensional numerical simulation of a surface dielectric barrier discharge (SDBD) plasma actuator, driven by a nanosecond voltage pulse, is conducted. A special focus is laid upon the influence of grid resolution on the computational result. It is found that the computational result is not very sensitive to the streamwise grid spacing, whereas the wall-normal grid spacing has a critical influence. In particular, the computed propagation velocity changes discontinuously around the wall-normal grid spacing about 2 μm due to a qualitative change of discharge structure. The present result suggests that a computational grid finer than that was used in most of previous studies is required to correctly capture the structure and dynamics of streamer: when a positive nanosecond voltage pulse is applied to the upper electrode, a streamer forms in the vicinity of upper electrode and propagates along the dielectric surface with a maximum propagation velocity of 2 × 108 cm/s, and a gap with low electron and ion density (i.e., plasma sheath) exists between the streamer and dielectric surface. Difference between the results obtained using the finer and the coarser grid is discussed in detail in terms of the electron transport at a position near the surface. When the finer grid is used, the low electron density near the surface is caused by the absence of ionization avalanche: in that region, the electrons generated by ionization is compensated by drift-diffusion flux. In contrast, when the coarser grid is used, underestimated drift-diffusion flux cannot compensate the electrons generated by ionization, and it leads to an incorrect increase of electron density.

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Section: B Computational Domain and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of grid resolution in fluid-model simulation of nanosecond dielectric barrier discharge plasma actuator

Hua

Fukagata

2018

AIP Advances

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“…Synchronous start, within 0.2 ns, of the streamers from the edge of the high-voltage electrode and propagation along the dielectric provide a synchronous energy relaxation with generation of weak shock waves near the surface of the dielectric. Numerical modeling of the nSDBDs developed during last 10 years, provides a deep insight into physics of the nanosecond surface discharges [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Filamentary nanosecond surface dielectric barrier discharge. Experimental comparison of the streamer-to-filament transition for positive and negative polarities

Ding¹,

Khomenko²,

Shcherbanev³

et al. 2019

Plasma Sources Sci. Technol.

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Streamer-to-filament transition is a general feature of high pressure high voltage nanosecond surface dielectric barrier discharges (nSDBDs) for mixtures containing molecular gases. The transition is observed at high pressures and voltages in a single-shot experiment a few nanoseconds after the start of the discharge. A set of experimental results comparing streamer-to-filament transition and properties of plasma in the filaments for the identical high voltage pulses of negative and positive polarity is presented. The transition curves in voltage-pressure coordinates are obtained for N 2 :O 2 mixtures with different content of molecular oxygen, from 0 to 20%, at the pressure range 1-12 bar. Continuous optical spectra are compared for both polarities in 6 bar synthetic air. Electron density is calculated from Stark broadening of H α line at λ = 656.5 nm in the discharge and in early afterglow, 40 nanoseconds after the end of the high voltage pulse. Hydrodynamic perturbations are measured using schlieren imaging in 1-6 bar air for streamer and filamentary mode for both polarities. The review of common and distinctive features of the filamentary single-shot nSDBD for two polarities of the applied pulse is provided.

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“…The main properties of dielectric materials are dielectric constant, thermal conductivity, electric volume resistivity, and specific heat. In the present work, the effects of dielectric materials are studied by changing the dielectric constant, as in the previous studies [11,14]. As a result, the effects of the dielectric constant (ε) and dielectric barrier thickness (td) are investigated in the following.…”

Section: Effects Of Dielectric Barriermentioning

confidence: 98%

“…There are few investigations on the effects of dielectric barrier. The dielectric constant and the dielectric barrier thickness are the two dominant parameters that affect the discharge characteristics; they have been studied in [11,12,13,14] and [11,13,15,16], respectively. It was found that the current and the surface charge density on the dielectric barrier surface increase with the dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effects of Dielectric Barrier on a Nanosecond Pulsed Surface Dielectric Barrier Discharge

et al. 2019

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In order to understand the impacts of dielectric barrier on the discharge characteristics of a nanosecond pulsed surface dielectric barrier discharge (NS-DBD), the effects of dielectric constant and dielectric barrier thickness are numerically investigated by using a three-equation drift–diffusion model with a 4-species 4-reaction air chemistry. When the dielectric constant increases, while the dielectric barrier thickness is fixed, the streamer propagation speed (V), the maximum streamer length (L), the discharge energy (QD_ei), and the gas heating (QGH) of a pulse increase, but the plasma sheath thickness (h), the fast gas heating efficiency η, and the charge densities on the wall surface decrease. When the dielectric barrier thickness increases, while the dielectric constant is fixed, V, L, QD_ei, and QGH of a pulse decrease, but h, η, and the charge densities on the wall surface increase. It can be concluded that the increase of the dielectric constant or the decrease of the dielectric barrier thickness results in the increase of the capacitance of the dielectric barrier, which enhances the discharge intensity. Increasing the dielectric constant and thinning the dielectric barrier layer improve the performance of the NS-DBD actuators.

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Nanosecond surface dielectric barrier discharge in atmospheric pressure air: I. measurements and 2D modeling of morphology, propagation and hydrodynamic perturbations

Cited by 84 publications

References 54 publications

Influence of grid resolution in fluid-model simulation of nanosecond dielectric barrier discharge plasma actuator

Influence of grid resolution in fluid-model simulation of nanosecond dielectric barrier discharge plasma actuator

Filamentary nanosecond surface dielectric barrier discharge. Experimental comparison of the streamer-to-filament transition for positive and negative polarities

Numerical Investigation on the Effects of Dielectric Barrier on a Nanosecond Pulsed Surface Dielectric Barrier Discharge

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