Observation of arc modes in a magnetically rotating arc plasma generator

Wang, Cheng; Cui, Haichao; Zhang, Zelong; Xia, Weiluo; Xia, Weidong

doi:10.1002/ctpp.201700056

Cited by 14 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Where d is length of the arc; C d is aerodynamic drag coefficient; D is arc diameter; p is gas density and v is the gas swirl velocity; while the f s is principally related to the electrode conditions, such as electrode material, surface roughness and so on. [27,28] As the gas flow rate increases, the swirl velocity (v) increases, so the arc rotation rate increases. As the current increases, the rotation rate decreases, meaning that the increasing current increases the electrode surface drag (f s ).…”

Section: Arc Dynamics At the Inner Electrodementioning

confidence: 99%

Experimental study of the discharge characteristics of a 3D vortex gliding arc plasmatron

You

Wang

Yang

et al. 2022

Contributions to Plasma Physics

Self Cite

View full text Add to dashboard Cite

The three‐dimensional (3D) vortex gliding arc plasmatron (GAP) is a promising gliding arc source due to its high reactant conversion rate and high energy efficiency, but there are few studies of its discharge characteristics. In this work, a 3D GAP device with a quartz window on the inner electrode is designed and studied. By means of high‐speed photography, high‐resolution current/voltage signal acquisition, and emission spectra, the effects of arc current, gas flow rate, electrode diameter, and electrode polarity on the discharge characteristics of this GAP are investigated. Results show that the volt‐ampere characteristic of GAP can be accurately predicted by similarity theory, and that the voltage for reverse‐polarity is significantly greater than that for normal‐polarity. Arc dynamics show that the arc at the inner electrode has the feature of high‐speed rotation, while the arc at the outer electrode has an extended current channel along with a large‐scale re‐strike process. The rotation speed and current channel length are closely related to electrode polarity, which can be ascribed to the movability of the cathode arc root. Emission spectra confirm that the plasma produced by GAP has typical non‐equilibrium properties, in which the rotational temperature ranges from 2,400 to 3,000 K and the vibrational temperature from 4,700 to 6,000 K. Moreover, abundant active free radicals, including NO, N2+$$ {\mathrm{N}}_2^{+} $$, O, and N, are detected in the plasma region. This investigation provides a better understanding of the discharge characteristics of 3D GAP, and will help to guide its further design and application.

show abstract

Section: Arc Dynamics At the Inner Electrodementioning

confidence: 99%

Experimental study of the discharge characteristics of a 3D vortex gliding arc plasmatron

You

Wang

Yang

et al. 2022

Contributions to Plasma Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, by means of rotation, elongation, and convection, the nonthermal equilibrium plasma can be strengthened, resulting in the reduction of gas temperature and increase in the number of active particles. In order to enhance the residence time of gas in the plasma region and improve the uniformity of the plasma region, the gliding arc has evolved from traditional two-dimensional blade electrode structures [13,14] to threedimensional rotating gliding arc structures, featuring three primary configurations: motor-driven rotating arc discharge devices [15,16], gas flow-driven rotating gliding arc (GDGA) devices [17,18], and magnetic-driven rotating gliding arc (MDGA) devices [19,20]. Moreover, combining GDGA and MDGA characteristics [21,22] can further enhance the rotation of the gliding arc.…”

Section: Introductionmentioning

confidence: 99%

Research on key influencing factors and mechanisms of improved nitrogen fixation efficiency in magnetic-driven gliding arc

Zhang,

Liu,

Luo

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Gliding arc is considered to be an efficient method for nitrogen fixation. In this study, an improved magnetic-driven rotating gliding arc method was adopted to investigate the effects of gas flow rate, current, magnetic field, nitrogen-to-oxygen ratio in the working gas, and relative humidity on nitrogen fixation efficiency. To further understand the relationship between the discharge mechanism and nitrogen fixation efficiency, the arc length, arc diameter, arc rotation frequency, and reaction pathway were studied to find the relationship between external parameters, discharge characteristics, and nitrogen fixation efficiency. The research results indicate that the discharge current and magnetic field not only change the rotation frequency of the gliding arc, but also affect its length and diameter, and the amount of ionizing gases involved in the working gas, thus affecting nitrogen fixation efficiency. When the nitrogen volume ratio in the feed gas is 60%, the lowest energy cost can be achieved, which is 18.6% lower than that of air. The energy cost of nitrogen fixation is closely related to the humidity of the air. As the humidity increases, the energy cost also increases. At the magnetic field strength of 160 mT, gas flow rate of 10 l min−1, and current of 40 mA, the energy cost of 1.708 MJ mol−1 is realized which is the current lowest for plasma nitrogen fixation in this study.

show abstract

“…Therefore, many techniques have been developed to reduce the anode ablation and improve the stability of the arc plasma. These techniques include rotating the arc using an external magnetic field [12][13][14], the use of a multielectrode structure [15,16], and the gas-dynamic dispersion method [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The magnetically rotated arc can be used to produce a large area of homogeneous discharge, called the magnetically dispersed arc. At the same time, the arc root also rotates at high speed under the action of the external magnetic field [13,19,20]. The method leads to a limited expansion of the time-averaged arc anode attachment area.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of argon shielding gas on the suppression of nitrogen arc anode ablation

Hu¹,

Meng²,

Huang³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The high heat flux density of the DC arc often leads to severe anode ablation, which is a key factor limiting the wider use of the DC plasma torches. In this study, a series of comparative experimental studies are conducted with the goal of suppressing nitrogen arc anode ablation by combining argon shielding flow and anode structure. It is found that for the planar electrode structure, the use of argon shielding gas can alleviate the ablation of the anode by nitrogen arc to some extent. If a boron nitride channel is installed on the anode surface to constrain the argon shielding flow, the electrode ablation can be significantly reduced. The experimental results show that there is no significant ablation on the anode surface after 1 hour of operation of the nitrogen arc device with an arc current of 100 A. Further analysis reveals that, on the one hand, argon shielding gas can extend the range of motion of the nitrogen arc root along the anode surface and increase the speed of arc root motion, which has the effect of expanding the time-averaged arc anode attachment area. On the other hand, argon shielding gas can also increase the size of the nitrogen arc root and decrease the temperature of the arc root. The use of constraining channels can effectively control the range of motion of the arc root along the anode surface and strengthen the influence of argon shielding gas. The combination of these effects can substantially suppress the anode ablation of the DC arc device.

show abstract

Observation of arc modes in a magnetically rotating arc plasma generator

Cited by 14 publications

References 24 publications

Experimental study of the discharge characteristics of a 3D vortex gliding arc plasmatron

Experimental study of the discharge characteristics of a 3D vortex gliding arc plasmatron

Research on key influencing factors and mechanisms of improved nitrogen fixation efficiency in magnetic-driven gliding arc

Experimental study on the effect of argon shielding gas on the suppression of nitrogen arc anode ablation

Contact Info

Product

Resources

About