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Influence of gas dynamics on arc dynamics and the discharge power of a rotating gliding arc

Ananthanarasimhan, J and Lakshminarayana, R and Anand, M S and Dasappa, S (2019) Influence of gas dynamics on arc dynamics and the discharge power of a rotating gliding arc. In: PLASMA SOURCES SCIENCE & TECHNOLOGY, 28 (8).

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Official URL: https://dx.doi.org/10.1088/1361-6595/ab2169

Abstract

This work reports the design and characterization of a rotating gliding arc (RGA) reactor developed with novel electrode configuration. This RGA uses gas swirl discs having ` tangential gas entry ports/holes' (NH) to achieve arc rotation and does not employ any external magnets. This work investigates the effect of gas dynamics on (1) arc dynamics such as the arc's rotation and shape; (2) voltage fluctuation pattern; and (3) plasma discharge power for the designed RGA. Experiments were conducted using argon as the plasma forming gas with (a) two gas swirl discs (NH = 3 and 12) and (b) three different gas flow rates (Q = 5, 25 and 50 LPM) as control parameters. Cold flow simulation (CFS) studies using a multidimensional solver were used to understand gas dynamics. The arc rotational frequency (farc) measured from (1) a high-speed camera (HSC) and (2) fast Fourier transform (FFT) analysis of voltage, shows linear dependency on the Reynolds number (Re) calculated from CFS, with an R-2 = 0.98. The agreement improves (R-2 = 0.99) by applying linear fit only for the cases having turbulent Re. A close match between gas rotational frequency (f(gas)) calculated from CFS and experimentally measured f(arc) is seen. The turbulent regime of the gas flow causes: (1) twisting and bending of the arc; (2) sawtooth-like voltage fluctuations with irregular and non-sinusoidal waveform; and (3) arc blow off. The high-frequency voltage fluctuations were reduced/absent when the flow Re reduced from approximate to 6.0 x 10(4) to approximate to 1.0 x 10(4). These findings establish that the gas dynamics, in particular, the bulk flow phenomenon of the gas, has an explicit influence on arc dynamics of the RGA reactor. This novel RGA design has the potential to replace magnetically driven rotating gliding arc systems.

Item Type: Journal Article
Additional Information: copyright for this article belongs to IOP PUBLISHING LTD
Keywords: non-thermal plasma; rotating gliding arc; arc-gas dynamics; high-speed camera; FFT analysis
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Depositing User: Id for Latest eprints
Date Deposited: 18 Sep 2019 05:49
Last Modified: 18 Sep 2019 05:49
URI: http://eprints.iisc.ac.in/id/eprint/63565

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