A Model of Low-Speed Concurrent Flow Flame Spread Over a Thin Fuel
作者:
P. V. FERKUL,
J. S. T'IEN,
期刊:
Combustion Science and Technology
(Taylor Available online 1994)
卷期:
Volume 99,
issue 4-6
页码: 345-370
ISSN:0010-2202
年代: 1994
DOI:10.1080/00102209408935440
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A numerical model is developed to examine steady, laminar flame spread and extinction over a thin solid fuel in low-speed concurrent flow. The model incorporates an elliptic treatment of the upstream flame stabilization zone near the fuel burnout point, and a parabolic treatment of the downstream flame, which has a higher flow Reynolds number. This provides a more precise fluid-mechanical description of the flame than using parabolic equations throughout, and is the first time such an approach has been used in concurrent flame spread modeling. The parabolic and elliptic regions are coupled smoothly by matching boundary conditions. The solid phase consists of an energy equation with surface radiative loss and a surface pyrolysis relation. Calculations (with the flame spread rate being an eigenvalue) are performed for forced flow without gravitational influences in a range of velocities which are lower than those induced in a normal gravity buoyant environment. Steady spread with constant flame and pyrolysis lengths is found possible for thin fuels and this facilitates the adoption of a moving coordinate system attached to the flame.
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