Electric Arc Fluctuations in DC Plasma Spray Torch

Rat, Vincent; Mavier, Fabrice; Coudert, Jean-François

doi:10.1007/s11090-017-9797-7

Cited by 29 publications

(16 citation statements)

References 89 publications

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“…As one of the most important electrical parameters of the arc plasma, the arc voltage signal reflects some information of arc root dynamics . In the experiment, the voltage and current waveforms are sine‐like with a frequency of about 49.5 kHz, in which the effective value of current is about 248 mA and it varies a little with the experimental conditions.…”

Section: Resultsmentioning

confidence: 99%

“…(a) S 1 : Independent movement of three arc columns, (b) S 2 : confluence of two arc columns, (c) S 3 : confluence of three arc columns, (d) the disruption of arc confluence As one of the most important electrical parameters of the arc plasma, the arc voltage signal reflects some information of arc root dynamics. [26][27][28] In the experiment, the voltage and current waveforms are sine-like with a frequency of about 49.5 kHz, in which the effective value of current is about 248 mA and it varies a little with the experimental conditions. To better understand the influence factors of arc voltage fluctuation, the envelope of arc voltage waveform was extracted.…”

Section: F I G U R Ementioning

confidence: 99%

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Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Lin

Zhao

et al. 2019

Contributions to Plasma Physics

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In this letter, a multi‐arc generator with three high‐voltage electrodes and a common grounded one was developed for the purpose of obtaining large area and steady arc plasma at atmospheric pressure. Three typical discharge states were found in the multi‐arc generator: independent movement of three arc columns, confluence of two arc columns, and confluence of three arc columns. The three discharge states cyclically occur on the evolution of the arc discharge and their duration is influenced by the power dissipation and plasma working gas flow rate. With an increase of discharge power and a decrease of the gas flow rate, the duration of multiple arc confluence increases, which contributes to the suppression of the fluctuation amplitude of each arc. Frequency domain analysis of the arc voltage envelope shows that the frequency of arc fluctuation increases in the multi‐arc mode in the multi‐arc generator compared to that in the single arc mode.

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Section: Resultsmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Lin

Zhao

et al. 2019

Contributions to Plasma Physics

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“…Meanwhile, the arc was not observed at 18 µs in the mist feeding rates of 50 mg/s and 60 mg/s, which is related to the arc reattachment in the restrike phenomenon. e arc reattachment process is well known as the formation of a new anode attachment closer to the cathode through a new current path by breakdown of the arc according to periodic large voltage drops (Moreau et al, 2006;Fauchais et al, 2014;Rat et al, 2017). Previous experimental ndings also reported a similar result (Dorier et al, 2001).…”

Section: Arc Behavior and Temperature Distributionmentioning

confidence: 87%

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Kim

Tanaka

Watanabe

et al. 2021

J. Chem. Eng. Japan

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The present study investigates the arc behavior and temperature distribution in a water plasma with mist generation under di erent mist feeding rates. The arc uctuation was observed using a high-speed camera with arc voltage measurement. Further, the arc temperature was visualized by a high-speed video camera and band-pass lters based on the Boltzmann plot method. The experimental results showed that the arc uctuation was in the restrike mode, and the frequency as well as the arc length apparently increased with an increase of mist feeding rate due to stronger drag force. Higher arc existence probability was also observed. At the same time, the mist feeding rate played an important role in controlling the arc area with high temperature. This study will open up new opportunities for waste treatment by understanding the fundamental arc characteristics in a water plasma system.

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“…There are inherent fluctuations from step one of this process, as there are instabilities in the arc that creates the plasma initially. This arc instability causes variation in the input electrical power as well as pressure fluctuations (Ref 7 ) whose effect is only compounded by turbulence in the plasma flow. These fluctuations in the plasma jet cause residence times to vary between particles and can result in uneven heating of the feedstock which can have significant implications on the properties of the resulting coatings (Ref 8 ).…”

Section: Introductionmentioning

confidence: 99%

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

2022

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Instabilities and fluctuations of the plasma jet in a thermal spray process can have a significant influence on the particle in-flight temperatures and velocities, affecting the properties of resulting plasma-sprayed coatings. Presented in this paper is a novel method for capturing the effects particles are exposed to in the plasma spraying process. High-speed camera images of a plasma jet generated by a cascaded three-cathode plasma generator (TriplexPro-210) were recorded for varying operating conditions. The images are processed using the inverse Abel transform. This transformation accounts for the fact that the images represent a 2D projection of the 3D jet and generates more accurate intensity values that the sprayed particles would experience. These images are then combined with particle tracks resulting from CFD simulations of the plasma jet to match the particles path with the recorded plasma jet. This new method allows a precise description of the plasma intensity experienced by individual particles with a high temporal resolution. The results show a high sensitivity of the method, even detecting the influence on the particles of the plasma jet originating from the cascaded triple arc plasma generator, which is considered as rather stable.

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Electric Arc Fluctuations in DC Plasma Spray Torch

Cited by 29 publications

References 89 publications

Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

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