期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 32, 期 -, 页码 1671-1678出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.06.071
关键词
Turbulent non-premixed jet flames; Flame stability; Blowout limits; Co-flow; Diluents
资金
- National Science and Engineering Research Council of Canada
The stability behaviour of non-premixed jet flames in a co-flowing air stream was investigated experimentally. The experimental data obtained indicate that there exists a range of co-flow velocity where two distinctly different extinction limits can Occur at the same co-flow velocity depending on whether the flame is lifted or attached at ignition. Results show that co-flow Velocity hits a much greater effect on the blowout limits of lifted flames than on the blowoff limits of attached flames. The blowout limit of lifted flames initially increase linearly with co-flow velocity independent of nozzle diameter until a peak value is reached, after which it decreases rapidly with increasing co-flow velocity. Such behaviour appears to be governed by two different mechanisms. A model for predicting lifted flame blowout limits hits been developed. It is based on the ratio of the Kolmogorov time scale and the chemical time scale as a function of a jet similarity parameter. The model was used to predict the blowout limits for methane as well its the effect of diluents in either fuel or co-flow stream. Results show very good agreement with experimental data in the current investigation. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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