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A parametric study of the microwave plasma-assisted combustion of premixed ethylene/air mixtures

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Abstract

A parametric study of microwave argon plasma assisted combustion (PAC) of premixed ethylene/air mixtures was carried out using visual imaging, optical emission spectroscopy and cavity ringdown spectroscopy as diagnostic tools. The parameters investigated included the plasma feed gas flow rate, the plasma power, the fuel equivalence ratio and the total flow rate of the fuel/air mixture. The combustion enhancement effects were characterized by the minimum ignition power, the flame length and the fuel efficiency of the combustor. It was found that: (1) increasing the plasma feed gas flow rate resulted in a decrease in the flame length, an increase in the minimum ignition power for near stoichiometric fuel equivalence ratios and a corresponding decrease in the minimum ignition power for ultra-lean and rich fuel equivalence ratios; (2) at a constant plasma power, increasing the total flow rate of the ethylene/air mixture from 1.0 slm to 1.5 slm resulted in an increase in the flame length and a reduction in the fuel efficiency; (3) increasing the plasma power resulted in a slight increase in flame length as well as improved fuel efficiency with fewer C2(d) and CH(A) radicals present downstream of the flame; (4) increasing the fuel equivalence ratio caused an increase in flame length but at a reduced fuel efficiency when plasma power was kept constant; and (5) the ground state OH(X) number density was on the order of 1015 molecules/cm3 and was observed to drop downstream along the propagation axis of the flame at all parameters investigated. Results suggest that each of the parameters independently influences the PAC processes.

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Authors and Affiliations

  1. Department of Physics and Astronomy, Mississippi State University, Starkville, MS, 39759, USA

    Che A. Fuh, Wei Wu & Chuji Wang

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  1. Che A. Fuh
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  2. Wei Wu
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  3. Chuji Wang
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Correspondence to Chuji Wang.

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Fuh, C.A., Wu, W. & Wang, C. A parametric study of the microwave plasma-assisted combustion of premixed ethylene/air mixtures. Eur. Phys. J. D 71, 302 (2017). https://doi.org/10.1140/epjd/e2017-80259-6

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  • DOI: https://doi.org/10.1140/epjd/e2017-80259-6

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