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http://dx.doi.org/10.3795/KSME-B.2012.36.6.639

Characteristics of Autoignited Laminar Lifted Flames in Heated Coflow Jets of Carbon Monoxide/Hydrogen Mixtures  

Choi, Byung-Chul (Environment & Plant Team, Korean Register of Shipping)
Chung, Suk-Ho (Clean Combustion Research Center, King Abdullah University of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.6, 2012 , pp. 639-646 More about this Journal
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.
Keywords
Autoignition; Hydrogen; Carbon Monoxide; Lifted Flame;
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Times Cited By KSCI : 2  (Citation Analysis)
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