Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges

Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo and Antonio Ficarella
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Maria Grazia De Giorgi: Department Engineering for Innovation, University of Salento, 73100 Lecce LE, Italy
Aldebara Sciolti: Department Engineering for Innovation, University of Salento, 73100 Lecce LE, Italy
Stefano Campilongo: Department Engineering for Innovation, University of Salento, 73100 Lecce LE, Italy
Antonio Ficarella: Department Engineering for Innovation, University of Salento, 73100 Lecce LE, Italy

Energies, 2017, vol. 10, issue 3, 1-15

Abstract: Reduction of nitric oxides (NOx) in aircraft engines and in gas turbines by lean combustion is of great interest in the design of novel combustion systems. However, the stabilization of the flame under lean conditions is a main issue. In this context, the present work investigates the effects of sinusoidal dielectric barrier discharge (DBD) on a lean inverse diffusive methane/air flame in a Bunsen-type burner under different actuation conditions. The flame appearance was investigated with fixed methane loading (mass flux), but with varying inner airflow rate. High-speed flame imaging was done by using an intensified (charge-coupled device) CCD camera equipped with different optical filters in order to selectively record signals from the chemiluminescent species OH*, CH*, or CO2* to evaluate the flame behavior in presence of plasma actuation. The electrical power consumption was less than 33 W. It was evident that the plasma flame enhancement was significantly influenced by the plasma discharges, particularly at high inner airflow rates. The flame structure changes drastically when the dissipated plasma power increases. The flame area decreases due to the enhancement of mixing and chemical reactions that lead to a more anchored flame on the quartz exit with a reduction of the flame length.

Keywords: diffusive methane/air flames; inverse flames; plasma actuator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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