Measurement of Anode Arc Attachment Movement in DC Arc Plasma Torch at Atmospheric Pressure

Ondáč, Peter; Mašláni, A.; Hrabovský, Milan; Jenista, Jiri

doi:10.1007/s11090-018-9888-0

Cited by 8 publications

(14 citation statements)

References 23 publications

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“…This paper is a continuation of our previous study [29] on anode arc attachment at atmospheric pressure in a non-transferred hybrid DC arc plasma torch with an external anode.…”

Section: Introductionmentioning

confidence: 79%

“…The camera footage and arc voltage waveforms were processed according to the methods described in our previous publication [29]. We therefore essentially worked with the time dependencies of the attachment position and cathodeanode voltage which both have a saw-toothed shape and are synchronized with one another.…”

Section: Resultsmentioning

confidence: 99%

“…The anode area was filmed through an ordinary silicate glass window using a monochromatic high-speed camera, a Photron FASTCAM SA-X2, with a frame rate of 300 000 fps, a pixel resolution of 256 × 80, and an exposure time of 0.29 µs. This frame rate is high enough to observe the rapid movement of arc anode attachments [29]. A Canon 70-300 mm camera lens was used together with 1000×, 64×, and 8× gray optical filters.…”

Section: Plasma Torch and Instrumentsmentioning

confidence: 99%

“…The method used to estimate electrical conductivity of the arc column in the anode area from arc voltage fluctuations during restrike mode [29] was used in this work for different ambient pressures. Figure 8 Figure 9(b) shows a comparison between the electric field inside the arc column (E arc ), estimated in the same way as σ arc , and the electric field in the plasma measured by two electric probes (E probe ).…”

Section: Electric Field and Electrical Conductivitymentioning

confidence: 99%

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Experimental investigation of anode arc attachment area in DC arc plasma torch at low pressures

Ondáč

Mašláni

Hrabovský

2019

J. Phys. D: Appl. Phys.

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The anode area and anode erosion of a DC arc plasma torch with an external anode are experimentally investigated using different ambient pressures, arc currents, and anode configurations. A high-speed camera, high-voltage probe, electric probes, and a Schlieren system are utilized. The electric field in the anode area is measured using electric probes at arc electric currents lower than 100 A. It is found that a mean value of the arc electric field above the anode can be satisfactorily estimated in a non-intrusive way when the anode attachment is constricted. Anode erosion is proportional to a variable that can be compared in different experimental conditions just by quickly processing high-speed video footage, even while the plasma torch is in operation. Anode erosion decreases along with ambient pressure and it is lower when a diffuse anode arc attachment is present as opposed to a constricted anode attachment. The sources of plasma fluctuations inside and around the plasma jet are mainly the movement of the anode arc attachment and turbulent vortices. The average speed of the anode arc attachment increases with decreases in ambient pressure. On the contrary, the average period of the restrike process, or the distance between the exit nozzle and the average attachment's position, decreases with reductions in ambient pressure. We report ambient pressure values for the transition between a constricted and diffuse anode arc attachment and for the transition between subsonic and supersonic plasma flow.

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“…This paper is a continuation of our previous study [29] on anode arc attachment at atmospheric pressure in a non-transferred hybrid DC arc plasma torch with an external anode.…”

Section: Introductionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Plasma Torch and Instrumentsmentioning

confidence: 99%

Section: Electric Field and Electrical Conductivitymentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of anode arc attachment area in DC arc plasma torch at low pressures

Ondáč

Mašláni

Hrabovský

2019

J. Phys. D: Appl. Phys.

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“…The flow and heat transport strongly depends on the species distribution in the plasma that affect e.g. arc shunting and the anode attachment restriction mode [54].…”

Section: Introductionmentioning

confidence: 99%

Modeling of argon–steam thermal plasma flow for abatement of fluorinated compounds

Jenista¹,

Chau²,

Chien³

et al. 2022

J. Phys. D: Appl. Phys.

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This study presents a numerical model of the hybrid–stabilized argon–steam thermal DC plasma torch of a new design for generating an argon–steam plasma suitable for efficient abatement of persistent perfluorinated compounds (PFCs). The model includes the discharge region and the plasma jet flowing to the surrounding steam atmosphere contained in a plasma-chemical chamber. Compared to previous studies, the torch had a smaller nozzle diameter (5.3 mm) and a reduced input power (20-40 kW) and arc current (120-220 A). The outlet region for the plasma jet extends to 20 cm downstream of the exit nozzle. Fluid dynamic and thermal characteristics together with diffusion of argon, hydrogen and oxygen species, and distribution of plasma species in the discharge and the plasma jet are obtained for currents from 120 to 220 A. The results of the calculations show that the plasma jet exhibits high spatiotemporal fluctuations in the shear layer between the plasma jet and colder steam atmosphere. The most abundant species in the plasma jet are hydrogen and oxygen atoms near the jet center, and molecules of H2, O2 and OH in colder surrounding regions. Satisfactory agreement is obtained with measurements of the radial temperature and electron number density profiles near the jet center close to the nozzle exit.

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Experimental Observations of Constricted and Diffuse Anode Attachment in a Magnetically Rotating Arc at Atmospheric Pressure

Wang

Sun

et al. 2019

Plasma Chem Plasma Process

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Measurement of Anode Arc Attachment Movement in DC Arc Plasma Torch at Atmospheric Pressure

Cited by 8 publications

References 23 publications

Experimental investigation of anode arc attachment area in DC arc plasma torch at low pressures

Experimental investigation of anode arc attachment area in DC arc plasma torch at low pressures

Modeling of argon–steam thermal plasma flow for abatement of fluorinated compounds

Experimental Observations of Constricted and Diffuse Anode Attachment in a Magnetically Rotating Arc at Atmospheric Pressure

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