Flame Front Propagation in Nonsteady Hydrodynamic Fields
作者:
WM. T. ASHURST,
GREGORYI. SIVASHINSKY,
VICTOR YAKHOT,
期刊:
Combustion Science and Technology
(Taylor Available online 1988)
卷期:
Volume 62,
issue 4-6
页码: 273-284
ISSN:0010-2202
年代: 1988
DOI:10.1080/00102208808924013
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We show asymptotically and numerically that a constant-density flame will exhibit different geometrical shapes which depend on the flow time-scales. In particular, a frozen flow may yield a flame surface composed of bulges connected by cusps, whereas a pulsating flow may dampen the flame motion to the extent that only a flat, laminar flame surface will be possible. The cusp nature disappears when the eddy frequency becomes comparable touLk, whereuLis the laminar flame speed and k is a characteristic wave number of the flow. Flame shapes obtained with a sheet of laser light within a spark-ignited engine show a cusp nature only at low engine RPM, in agreement with the frequency criteria given above.
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