Discharge modes of atmospheric pressure DC plasma jets operated with air or nitrogen

Pei, Xiaobing; Kredl, Jana; Lü, Xin; Kolb, Juergen F.

doi:10.1088/1361-6463/aad4e9

Cited by 28 publications

(20 citation statements)

References 47 publications

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“…Pei et al researched the plasma discharge modes under different discharge parameters with N 2 and air as working medium gases for a DC arc plasma igniter [18]. Furthermore, Zhong et al conducted a high-frequency arc discharge plasma ignition experiment in the combustion chamber of a supersonic ramjet engine [19], in order to study the breakdown characteristics, ignition efficiency, and ablation conditions of the igniter using air and N 2 as the working medium gases.…”

Section: Introductionmentioning

confidence: 99%

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

Chen

Bing

et al. 2019

Journal of Spectroscopy

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Ar, N2, O2, and N2-O2 mixture under different O2 components were separately used as the working medium gas of a plasma igniter to study the influence of working-medium-gas type and O2 concentration on emission spectral and temperature characteristics of a direct-current arc plasma igniter. The emission spectra of the plasma jet were also analyzed using the optical emission spectroscopy method, and the influence rule of working medium gas and O2 concentration on electron temperature and vibrational temperature of the plasma jet was calculated and analyzed. The experimental results show that the emission spectra of the plasma jet had significant differences when diverse working gases were used as the working medium of the igniter. With increasing O2 concentration in the working medium gas, the spectral line intensity of oxygen-containing particles in emission spectra of the plasma jet was significantly enhanced, and the spectral intensities of nitrogen-containing particles, NO molecular bands, the second positive system of N2C3∏u−B3∏g, and the first negative system of N2+B2∑u+−X2∑u+ were also enhanced obviously. Both electron and vibrational temperature of the plasma jet increased gradually with increasing O2 concentration in the working medium gas, and first increased and then decreased with increasing axial distance from the plasma jet.

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Section: Introductionmentioning

confidence: 99%

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

Chen

Bing

et al. 2019

Journal of Spectroscopy

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“…Pei et al [14] investigated two discharge modes (a self-pulsing and 'true' DC discharge mode) that were observed for a plasma jet operated at atmospheric pressure with air or nitrogen by applying a DC high voltage to micro-hollow cathode geometry. These different modes can be controlled by gas flow rate and applied high voltage.…”

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confidence: 99%

Special issue on recent developments in plasma sources and new plasma regimes

Akishev

Machala

Koval

2019

J. Phys. D: Appl. Phys.

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With great enthusiasm we present this special issue of Journal of Physics D: Applied Physics, which collects the best selection of the recent state-of-the-art in experimental and numerical research of non-thermal plasma sources and discharge regimes and their wide application possibilities. The research achievements and generation of such plasma discharges promote the advances in many areas of science and technology and open or stimulate new horizons and possibilities for their uses. The issue presents a wide spectrum of new approaches for pulsed generation of plasmas by the ultra-high electric field of nanosecond/ sub-nanosecond duration, formation of discharges with runaway electrons, and generation of plasma by electromagnetic beams from microwave to terahertz diapason. New plasma regimes that were created by various plasma jets and multi-jets, dielectric barrier or other kinds of gas discharges operating in gases, as well as discharges interacting with or directly in liquids are also extensively addressed. Several contributions include modeling of some of these new plasma regimes, and most of them provide examples of applications that benefit from these plasma source designs, with a special focus on biomedical, agricultural, combustion, environmental, nanoparticle and diamond synthesis, and other emerging applications. The special issue is launched with a topical review on low pressure discharges with hollow cathode and anode and their applications, by Korolev and Koval [1]. As historically plasma science started with low pressure electrical discharges and recently the focus moved to atmospheric pressure with a large variety of new applications, reviewing low pressure discharges with extremely small neutral particle density and electron free path in excess of the size of the discharge gap, where the discharge regimes are between the avalanche ioniz ation and pure vacuum discharge in the cathode metal vapors, is still timely. New approaches to the interpretation of the discharge formation mechanism and sustaining are discussed and offer the possibility to obtain a uniform plasma in a large volume of the cathode or anode cavity, in the sources of electron and ion beams based on the plasma cathode and in the high-current pseudospark switches. Several research papers in the issue deal with recent developments and new plasma regimes under low pressures. Burdovitsin et al [2] investigated the beam-plasma formed by an energetic electron beam at fore-vacuum pressure (1-10 Pa range). The maximum plasma density at the optimum collector potential can be much greater than the plasma density when the collector is at ground or at floating potential. Bokhan et al [3] studied an open discharge with counter-propagating electron beams applicable in high voltage pulsed switches with a sub-nanosecond leading edge (kivotrons). It was shown that a fast current development arises when the discharge self-sustaining mode is caused by the photoemission from the cathodes due to the resonant radiation emitted by fast helium atoms with a...

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“…However, studies on the utilization of air plasmas are still scarce because of the variation of gas component and its necessity for the high ignition current that results in high plasma temperature and less plasma volume. On the contrary, most of the studies on pulse-modulation effects on reactive species generally focus on standard alternating-current (AC) signal, duty cycle modulation, and different frequency regime [27, 28]. Thus, because of the lack of research in this area, as well as the technical challenges, we developed a compact coaxial air plasma jet driven by kHz direct-current (DC) pulse modulation in a burst mode.…”

Section: Introductionmentioning

confidence: 99%

A compact pulse-modulation cold air plasma jet for the inactivation of chronic wound bacteria: development and characterization

Thana

Wijaikhum

Poramapijitwat

et al. 2019

Heliyon

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A compact low-temperature plasma jet device was developed to use ambient air as plasma gas. The device was driven by a 2.52-kV high-voltage direct-current pulse in a burst mode, with a repetition rate of 2 kHz. The maximum plasma discharge current was 3.5 A, with an approximately 10 ns full-width half-maximum. Nitric oxide, hydroxyl radical, atomic oxygen, ozone, and hydrogen peroxide—important reactive oxygen and nitrogen species (RONS)—were mainly produced. The amount of plasma-generated RONS can be controlled by varying the pulse-modulation factors. After optimization, the plasma plume length was approximately 5 mm and the treatment temperature was less than 40 °C. The preliminary bactericidal effects were tested on Staphylococcus aureus, Pseudomonas aeruginosa, and methicillin-resistant S. aureus (MRSA), and their biofilms. The results showed that the plasma can effectively inactivate S. aureus, P. aeruginosa, and MRSA in both time- and pulse-dependent manner. Thus, this produced plasma device proved to be an efficient tool for inactivating deteriorating bacteria. Further versatile utilization of this portable plasma generator is also promising.

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Discharge modes of atmospheric pressure DC plasma jets operated with air or nitrogen

Cited by 28 publications

References 47 publications

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

Special issue on recent developments in plasma sources and new plasma regimes

A compact pulse-modulation cold air plasma jet for the inactivation of chronic wound bacteria: development and characterization

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