BLOWOUT LIMITS OF TURBULENT JET DIFFUSION FLAMES FOR ARBITRARY SOURCE CONDITIONS

被引:58
作者
DAHM, WJA
MAYMAN, AG
机构
[1] Aerospace Engineering, University of Michigan, Ann Arbor, MI
[2] Rockwell Space Systems, Downey, CA
关键词
18;
D O I
10.2514/3.25186
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
We present a formulation for the blowout limits of turbulent jet diffusion flames issuing from sources with arbitrary geometries and exit conditions into otherwise quiescent environments. It is argued that, while the liftoff characteristics of turbulent diffusion flames appear likely to be controlled by the straining out of flame sheets, the molecular mixing rate at the flame tip controls their blowout characteristics. The concept of a “far-field equivalent source” is introduced, and the local molecular mixing rate in the flow is expressed in terms of the associated far-field scaling laws. Blowout is expected when a resulting algebraic expression reaches a critical value. Results of a “flip” experiment verify the far-field equivalent source formulation. Measurements of the blowout limits over a range of geometries, fuels, and diluents show good agreement with the predictions from this formulation. © 1990 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.
引用
收藏
页码:1157 / 1162
页数:6
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