Application of plasma discharges to the ignition of a jet diffusion flame

Ying-Hao Liao, Ming Chien Sun, Ru Yi Lai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


The present study experimentally investigates the effect of plasma discharges on the ignition of a laminar methane jet diffusion flame in a stream of co-flow air. The Reynolds number of the jet flame, based on the nominal jet velocity and the nozzle diameter, is approximately Re = 2000. The plasma discharge, a corona type, is produced between two tungsten wires with a diameter of 0.5 mm and a gap of 15 mm. Results show that the application of plasma discharge in a near-nozzle region can ignite the flame. A non-reacting free jet similarity solution is applied to examine the ignition locations and it shows that many of the locations are outside the jet boundary, where the mixture is leaner than stoichiometry. The minimum input power required for flame ignition is seen to increase with radial distance away from the nozzle and decrease with downstream locations. A high input power required for ignition is found to be close to the nozzle exit, where a high strain can be expected. Spectroscopic study confirms the emission spectra in non-thermal air plasma and shows the intensity difference in spectra between discharges that ignite and do not ignite flames.

Original languageEnglish
Title of host publicationSymposia
Subtitle of host publicationGas-Liquid Two-Phase Flows; Gas and Liquid-Solid Two-Phase Flows; Numerical Methods for Multiphase Flow; Turbulent Flows: Issues and Perspectives; Flow Applications in Aerospace; Fluid Power; Bio-Inspired Fluid Mechanics; Flow Manipulation and Active Control; Fundamental Issues and Perspectives in Fluid Mechanics; Transport Phenomena in Energy Conversion from Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858066
StatePublished - 1 Jan 2017
EventASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017 - Waikoloa, United States
Duration: 30 Jul 20173 Aug 2017

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
ISSN (Print)0888-8116


ConferenceASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017
CountryUnited States

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