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ISSN Druckformat: 2150-766X
ISSN Online: 2150-7678
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CYCLIC QUENCHING AND IGNITION OF LOW-STRETCH DIFFUSION FLAMES
ABSTRAKT
A transient numerical simulation on the response of counter-flow gaseous diffusion flames was carried out over the entire range of stretch rates with the fuel and oxygen ambient temperatures as varying parameters. The model assumes an overall chemical reaction but with flame radiation loss. The shapes of steady flame response curve obtained include "isola" at low ambient temperatures and "ghost" at high ambient temperatures. A cyclic flame ignition and quenching phenomenon was discovered in a low stretch region with moderate ambient temperatures. This paper presents the computed response curves and, in particular, the time-resolved cyclic event. In addition, a map using ambient temperature and stretch rate as coordinates is given to show the various regions of the diffusion flame response.