標題: Radiation effects for downward flame spread over a thermally thin fuel in a partial-gravity environment
作者: Wu, KK
Chen, CH
機械工程學系
Department of Mechanical Engineering
關鍵字: flame spread;partial gravity;radiation effect
公開日期: 1-十一月-2004
摘要: This study explores the effects of radiation on a downward flame spread over a thermally thin solid fuel in a partial-gravity environment. The radiation effect and gravitational field strength (g) are predicted not to influence the ignition delay time. The flame-spread rate reaches a maximum at g = 0.01. At g > 0.01, the flame stretch effect dominates the behaviors of the flame. Radiation heat transfer and oxygen transport control the flame behaviors for g < 0.01. The predicted quenching limit is g = 5 x 10(-6), close to the value obtained experimentally elsewhere. Radiation has two simultaneous effects. One is to reduce the flame strength by carrying heat to the ambient. The other one is combined with upstream conduction to enhance the total forward heat transfer rate and thus preheat virgin fuel upstream. The solid fuel temperature is low and some fuel is left over in low gravity due to radiation loss. Energy analyses indicate that the conduction heat flux from the flame (<(q(c))over bar>) dominates its behaviors. However, radiation gradually competes with (q(c)) over bar as the gravity is reduced.
URI: http://dx.doi.org/10.1080/00102200490504553
http://hdl.handle.net/11536/25710
ISSN: 0010-2202
DOI: 10.1080/00102200490504553
期刊: COMBUSTION SCIENCE AND TECHNOLOGY
Volume: 176
Issue: 11
起始頁: 1909
結束頁: 1933
顯示於類別:期刊論文


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  1. 000224699700005.pdf