Characteristics of autoignited laminar lifted flames in heated coflow jets of carbon monoxide/hydrogen mixtures

Byungchul Choi, Suk Ho Chung

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The characteristics of autoignited lifted flames in laminar jets of carbon monoxide/hydrogen fuels have been investigated experimentally in heated coflow air. In result, as the jet velocity increased, the blowoff was directly occurred from the nozzle-attached flame without experiencing a stabilized lifted flame, in the non-autoignited regime. In the autoignited regime, the autoignited lifted flame of carbon monoxide diluted by nitrogen was affected by the water vapor content in the compressed air oxidizer, as evidenced by the variation of the ignition delay time estimated by numerical calculation. In particular, in the autoignition regime at low temperatures with added hydrogen, the liftoff height of the autoignited lifted flames decreased and then increased as the jet velocity increased. Based on the mechanism in which the autoignited laminar lifted flame is stabilized by ignition delay time, the liftoff height can be influenced not only by the heat loss, but also by the preferential diffusion between momentum and mass diffusion in fuel jets during the autoignition process. © 2012 The Korean Society of Mechanical Engineers.
Original languageEnglish (US)
Pages (from-to)639-646
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers B
Volume36
Issue number6
DOIs
StatePublished - Jun 1 2012

ASJC Scopus subject areas

  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Characteristics of autoignited laminar lifted flames in heated coflow jets of carbon monoxide/hydrogen mixtures'. Together they form a unique fingerprint.

Cite this