Characterization of a dc plasma torch through its light and voltage fluctuations

Singh, Nityalendra; Razafinimanana, Manitra; Hlína, J.

doi:10.1088/0022-3727/33/3/313

Cited by 30 publications

(16 citation statements)

References 21 publications

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“…In this case, the working gas is axially injected into the arc chamber along the cathode tip. Singh et al [4] investigated the influence of the controllable parameters (gas flow rate and arc current) on the arc instabilities through the fluctuations of the arc voltage and luminous intensity in a dc argon plasma jet. Dorier et al [5] focused on the arc root behavior of a dc plasma torch by simultaneous measurements of the timeseries of the arc voltage and of images from the nozzle interior.…”

Section: Introductionmentioning

confidence: 99%

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Chéron

Yan

et al. 2007

Plasma Sources Sci. Technol.

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An atmospheric argon plasma jet generated by an original dc double anode plasma torch has been investigated through its electrical and spectroscopic diagnostics. The arc instabilities and dynamic behavior of the argon plasma are analyzed using classical tools such as the statistical method, fast Fourier transform (FFT) and correlation function. The takeover mode is identified as the fluctuation characteristic of the double arc argon plasma jet in our experiment. The FFT and correlation analysis of electrical signals exhibit the only characteristic frequency of 150 Hz, which originates from the torch power and is independent of any change in the operating parameters. No high frequency fluctuations (1-15 kHz) are observed. This indicates that the nature of fluctuations in an argon plasma jet is induced mainly by the undulation of the tri-phase rectified power supply. It is found that each arc root attachment is diffused rather than located at a fixed position on the anode wall. Moreover, the emission spectroscopic technique is performed to determine the electron temperature and number density of the plasma jet inside and outside the arc chamber. Along the torch axis, the measured electron temperature and number density of the double arc argon plasma drop from 12 300 K and 7.6 × 10 22 m −3 at the divergent part of the first anode nozzle, to 10 500 K and 3.1 × 10 22 m −3 at the torch exit. In addition, the validity criteria of the local thermodynamic equilibrium (LTE) state in the plasma arc are examined. The results show that the measured electron densities are in good agreement with those calculated from the LTE model, which indicates that the double arc argon plasma at atmospheric pressure is close to the LTE state under our experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Chéron

Yan

et al. 2007

Plasma Sources Sci. Technol.

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“…In the arc confluence state, a large area arc plasma zone fills the centre region of arc chamber, which results in a thin cold gas boundary layer between this large area arc plasma and inner wall of arc chamber. Thin cold gas boundary layer further promotes formation of a new arc attachment in the arc chamber wall again, which is close to the old one due to a relatively low voltage drop.…”

Section: Resultsmentioning

confidence: 92%

“…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: 97%

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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“…The main sources of process variations correspond to fluctuations in biomass flow rate due to changes of size and composition of the feedstock, nonuniform expansion of gases inside the reactor which generates a back-pressure that shortens the arc discharge, variability of the rate of cathode consumption, irregular residence times, and changes of temperature inside the reactor that vary the rates of thermochemical decomposition and syngas production. In addition, it has been documented in the literature that DC plasma arcs suffer from fluctuations due to several causes, which can consist of arc voltage and current variations, radiation, acoustic pressure effects [22,23], and the undulation of 3-phase rectified power supply [24].…”

Section: Methodsmentioning

confidence: 99%

Enhanced hydrogen production using steam plasma processing of biomass: Experimental apparatus and procedure

Dı́az

Sharma

Leal-Quiros

et al. 2015

International Journal of Hydrogen Energy

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Characterization of a dc plasma torch through its light and voltage fluctuations

Cited by 30 publications

References 21 publications

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

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

Enhanced hydrogen production using steam plasma processing of biomass: Experimental apparatus and procedure

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