A Numerical Study of Transient Ignition in a Counterflow Nonpremixed Methane-Air Flame Using Adaptive Time Integration
作者:
HONGG. IM,
LAXMINARAYANL. RAJA,
ROBERTJ. KEE,
LINDAR. PETZOLD,
期刊:
Combustion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 158,
issue 1
页码: 341-363
ISSN:0010-2202
年代: 2000
DOI:10.1080/00102200008947340
出版商: Taylor & Francis Group
关键词: Ignition;Adaptive Time Integration;DAE System
数据来源: Taylor
摘要:
This paper presents a computational algorithm to predict highly-transient flame behavior in counter-flow situations. The first objective of the paper is to extend the transient counterflow problem to incorporate some gasdynamic compressibility effects, yet retain the desirable similarity structure. By relaxing assumptions in earlier formulations, the computational algorithms can deliver high accuracy even in periods of extremely rapid transients, like combustion ignition. The algorithms are demonstrated on two combustion-ignition problems for methane-air, counterflow, nonpremixed flames. The first concerns the ignition transient in a steady strain field. The second concerns the effects of a high-frequency oscillatory strain field on the ignition process. The results reveal that, when the mean strain rate is near the steady ignition limit, the ignition process is highly sensitive to the details of the strain-rate fluctuations.
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