Direct ignition and the S-curve transition by in-situ nanosecond pulsed discharge in methane/oxygen/helium counterflow flame

Wenting Sun, Sang Hee Won, Yiguang Ju

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A novel well-defined plasma assisted combustion system with in-situ discharge on the counterflow flame was developed to study the direct coupling kinetic effect of the in-situ non-equilibrium plasma on the flame. The uniform discharge was generated between the two burner nozzles. The ignition and extinction characteristics of CH4/O2/He diffusion flame were investigated by monitoring the OH emission intensity at fixed strain rate and O2 concentration at the oxidizer side while varying the fuel mole fraction. A transition of ignition and extinction diagram from the conventional S-shape with both ignition and extinction limits to the monotonic and fully stretched S-shape without extinction limit was found at conditions with different O2 concentrations in the non-equilibrium plasma discharge. The monotonic and fully stretched "S" curve indicated clearly that the plasma generated reactive species caused a transition from extinction limited flame stabilization to ignition limited flame stabilization, that is, the extinction limit does not exist until the ignition limit is reached. The Rayleigh scattering measurement showed the local maximum temperature in the reaction zone at which ignition happened can be as low as 900 K.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
PublisherCombustion Institute
Pages405-413
Number of pages9
ISBN (Electronic)9781622761258
StatePublished - Jan 1 2011
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 - Storrs, United States
Duration: Oct 9 2011Oct 12 2011

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011

Other

OtherFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
CountryUnited States
CityStorrs
Period10/9/1110/12/11

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Mechanical Engineering
  • Chemical Engineering(all)

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    Sun, W., Won, S. H., & Ju, Y. (2011). Direct ignition and the S-curve transition by in-situ nanosecond pulsed discharge in methane/oxygen/helium counterflow flame. In Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 (pp. 405-413). (Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011). Combustion Institute.