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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