Kinetic ignition enhancement of H2 versus fuel-blended air diffusion flames using nonequilibrium plasma

Timothy Ombrello, Yiguang Ju

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Kinetic ignition enhancement of H2 diffusion flames by a nonequilibrium plasma discharge of H2- and CH4 -blended oxidizer was studied experimentally and numerically through the development of a well-defined counterflow system. Measurements of ignition temperatures and major species as well as computations of rates of production and sensitivity analyses were conducted to identify the important kinetic pathways. It was found that the competition between the catalytic effect of NOx and the inhibitive effects of H2O and CH4 governed the ignition processes in the system. With air as the oxidizer, ignition was enhanced from the plasma-produced NOx. With H2O or CH4 addition to the oxidizer, H2O formation significantly increased the ignition temperature. However, with plasma activation, the inhibitive effect of H2O was significantly reduced because of the dominant role of NOx. With CH4 addition to the oxidizer, the ignition temperatures increased due to the radical quenching by H2O or CH4, depending upon the strain rate. The results showed that the inhibitive effects were significantly decreased with plasma activation. Unlike vitiated air ignition, plasma-enhanced ignition for fuel-air mixtures can suppress the inhibitive effects of H2O and CH4 because of the overwhelming catalytic NOx effect at low temperatures.

Original languageEnglish (US)
Pages (from-to)2924-2932
Number of pages9
JournalIEEE Transactions on Plasma Science
Volume36
Issue number6
DOIs
StatePublished - Dec 4 2008

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Keywords

  • Diffusion flame
  • Fuel-blended oxidizer
  • Ignition enhancement
  • Nonequilibrium plasma

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