标题: Transient behaviors of a flame over a Tsuji burner
作者: Chen, Young-Da
Chen, Da-Da
Chen, Chiun-Hsun
机械工程学系
Department of Mechanical Engineering
关键字: Tsuji burner;Lift-off flame;Recirculation flow
公开日期: 1-十二月-2008
摘要: The present study investigated numerically the physical mechanisms underlying the transient behaviors of the flame over a porous cylindrical burner. The numerical results showed that a cold flow structure at a fixed inflow velocity of U (in) = 0.6 m/s in a wind tunnel could be observed in two co-existing recirculation flows. Flow variations occur repeatedly until t = 4.71 s, and then a vortex existed steadily behind the burner and no shading occurred. The ignition of flammable mixture led to a rapid rise in gas temperature and a sudden gas expansion. When it reached the stable envelope flame condition, U (in) is adjusted to an assigned value. Two blow-off mechanisms were identified. It was also found in the study flame shapes with buoyancy effects agreed with the ones observed experimentally by Tsai. Furthermore, the lift-off flame would appear briefly between the envelopes and wake ones, and was stabilized as a wake flame.
URI: http://dx.doi.org/10.1007/s10409-008-0177-7
http://hdl.handle.net/11536/8093
ISSN: 0567-7718
DOI: 10.1007/s10409-008-0177-7
期刊: ACTA MECHANICA SINICA
Volume: 24
Issue: 6
起始页: 645
结束页: 659
显示于类别:Articles


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