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Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

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  • Maria Grazia De Giorgi

    (Department of Engineering for Innovation, University of Salento, via per Monteroni, I-73100 Lecce, Italy)

  • Antonio Ficarella

    (Department of Engineering for Innovation, University of Salento, via per Monteroni, I-73100 Lecce, Italy)

  • Donato Fontanarosa

    (Department of Engineering for Innovation, University of Salento, via per Monteroni, I-73100 Lecce, Italy)

  • Elisa Pescini

    (Department of Engineering for Innovation, University of Salento, via per Monteroni, I-73100 Lecce, Italy)

  • Antonio Suma

    (Department of Engineering for Innovation, University of Salento, via per Monteroni, I-73100 Lecce, Italy)

Abstract

The present work focuses on the impact of dielectric barrier discharge (DBD) plasma actuators (PAs) on non-premixed lifted flame stabilization in a methane CH 4 -air Bunsen burner. Two coaxial DBD-PA configurations are considered. They are composed of a copper corona, installed on the outer surface of a quartz tube and powered with a high voltage sinusoidal signal, and a grounded needle installed along the burner axis. The two configurations differ in the standoff distance value, which indicates the positioning of the high frequency/high voltage (HV) electrode’s upper edge with respect to the needle tip. Experimental results highlight that flame reattachment is obtained at a lower dissipated power when using a negative standoff distance (i.e., placing the needle upstream with respect to the corona). At 11 kV peak-to-peak voltage and 20 kHz frequency, plasma actuation allowed for reattaching the flame with a very low dissipated power (of about 0.05 W). Numerical simulations of the electrostatic field confirmed that this negative standoff configuration has a beneficial effect on the momentum sources, which oppose the flow and show that the highest electric field extends into the inner quartz tube, as confirmed by experimental visualization close to the needle tip. The modeling predicted an increase in the gas temperature of about 21.8 °C and a slight modification of the fuel composition at the burner exit. This impacts the flame speed with a 10% increase close to the stoichiometric conditions with respect to the clean configuration.

Suggested Citation

  • Maria Grazia De Giorgi & Antonio Ficarella & Donato Fontanarosa & Elisa Pescini & Antonio Suma, 2020. "Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame," Energies, MDPI, vol. 13(6), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1452-:d:334722
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    References listed on IDEAS

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    Cited by:

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    2. Hookyung Lee & Min-Jung Lee, 2021. "Recent Advances in Ammonia Combustion Technology in Thermal Power Generation System for Carbon Emission Reduction," Energies, MDPI, vol. 14(18), pages 1-29, September.

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