Effects of surface dielectric barrier discharge on aerodynamic characteristic of train

Dong, Lifang; Gao, Guoqiang; Peng, Kaisheng; Wei, Wenfu; Li, Chunmao; Wu, Guangning

doi:10.1063/1.4995985

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…A Q-V Lissajous diagram was obtained by voltages on electrodes 1 and 2. The mechanism of Q-V Lissajous and power calculation has been described. , The voltage and current signals were collected by a digital oscilloscope (DPO3012, Tektronix, Inc.). The emission spectrum from SDBD was collected by a collimating lens (focal length: 10 mm) and analyzed by a spectrometer (Maya2000PRO, Ocean Optics).…”

Section: Methodsmentioning

confidence: 99%

Polyimide Surface Dielectric Barrier Discharge for Inactivation of SARS-CoV-2 Trapped in a Polypropylene Melt-Blown Filter

Baek

Jang

Kim

et al. 2022

ACS Appl. Polym. Mater.

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Surface dielectric barrier discharge (SDBD) was used to inactivate the infectious severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) trapped in a polypropylene (PP) melt-blown filter. We used a dielectric barrier made of polyimide films with hexagonal holes through which air flowed. In a cylindrical wind tunnel, the SDBD device supplied reactive oxygen species such as ozone to the SARS-CoV-2 trapped in the PP filter. A plaque assay showed that SDBD at an ozone concentration of approximately 51.6 ppm and exposure time of 30 min induced more than 99.78% reduction for filter-adhered SARS-CoV-2. A carbon catalyst after SDBD effectively reduced ozone exhaust below 0.05 ppm. The combination of SDBD, PP filter, and catalyst could be a promising way to decrease the risk of secondary infection due to indoor air purifiers.

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Section: Methodsmentioning

confidence: 99%

Polyimide Surface Dielectric Barrier Discharge for Inactivation of SARS-CoV-2 Trapped in a Polypropylene Melt-Blown Filter

Baek

Jang

Kim

et al. 2022

ACS Appl. Polym. Mater.

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“…The body force can induce a wall jet in quiescent air, and in an existing flow the body force is employed to get a beneficial modification of the mean velocity profile of the near-wall flow [9]. Dong et al [10] proposed that the drag reduction of a scaled train model can be obtained by using a SDBD plasma actuator to suppress the flow separation. They also found that the surface temperature of the dielectric and the induced flow velocity were increased as the applied voltage increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

Zhang

Sun

et al. 2019

Applied Sciences

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The present research aims to explore, by large-eddy simulation (LES), the potentiality and mechanism of multiple surface dielectric barrier discharge (multi-SDBD) plasma actuators to manipulate mean and fluctuating wind loads on a low-rise building. Three actuator configurations are located on the roof to induce directional wall jets in different directions. The effects of these configurations on flow structure and wind loads are studied in absence and presence of approaching flow. Results show that all subgrid-scale models can obtain accurate roof pressure, and for the diffusion and convection terms, the bounded central differencing scheme can provide more accurate predictions for the roof pressure. The control impact of active actuators gradually weakens with the increase of the approaching flow velocity. The direction of the wall jet can determine the position of the limited roof region with the reduced mean pressure coefficient. The multi-SDBD actuators continue to absorb the upstream flow and blow this flow downstream, meaning the wall jet exerts strong pressure on the local roof area at the end of the jet, which results in a significant reduction of the mean pressure coefficient. Furthermore, the counter-rotating vortices caused by the wall jet restrain the size and strength of the vortex shedding, thereby achieving the purpose of reducing the fluctuating pressure coefficient. Further analysis of the instantaneous vorticity fields indicates that the intensity and size of streamwise shedding vortices can be restrained by small-scale spanwise vortices induced by the plasma actuators. Under the action of the wall jet blowing from the trailing edge to the leading edge, the fluctuating lift and drag coefficients can be reduced by over 15% and the fluctuating pressure coefficient can be reduced by about 20% from the no actuation situation.

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Electrical and optical characteristics of surface plasma actuator based on a three-electrode geometry excited by nanosecond-pulse and DC sources

Kong,

Wang,

Zhang

et al. 2017

Physics of Plasmas

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Plasma actuator based on surface dielectric barrier discharge for active flow control has been widely investigated due to broad application prospects. In order to obtain extensive surface plasma, a plasma actuator based on a three-electrode structure sustained by nanosecond-pulse and DC sources is investigated. In this paper, the correlation between actuator parameters (especially in DC source polarity) and discharge characteristics is presented. The experimental results show that the plasma length is extended up to the third electrode due to a sliding discharge induced by a negative DC voltage. The negative DC voltage has a significant effect on the discharge current and propagation velocity of the slide discharge. Compared to the negative DC voltage, the plasma actuator with a positive DC voltage is difficult to induce a sliding discharge. Moreover, the spectrum characteristics, pressure wave, and vortex characteristics are investigated by means of time-resolved spectrum and schlieren visualization, respectively. The vortex characteristics indicate that the sliding discharge at a negative DC voltage induces two jets in opposite directions. However, the vortex characteristics with a positive DC voltage show that the air flow can be induced closer to the dielectric surface than those with a negative DC voltage. It is because a larger perturbation region in the case of positive DC voltage is beneficial to jet acceleration and thus enhances the flow control capability.

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Effects of surface dielectric barrier discharge on aerodynamic characteristic of train

Cited by 6 publications

References 25 publications

Polyimide Surface Dielectric Barrier Discharge for Inactivation of SARS-CoV-2 Trapped in a Polypropylene Melt-Blown Filter

Polyimide Surface Dielectric Barrier Discharge for Inactivation of SARS-CoV-2 Trapped in a Polypropylene Melt-Blown Filter

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

Electrical and optical characteristics of surface plasma actuator based on a three-electrode geometry excited by nanosecond-pulse and DC sources

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