Title: | Transient behaviors of a flame over a Tsuji burner |
Authors: | Chen, Young-Da Chen, Da-Da Chen, Chiun-Hsun 機械工程學系 Department of Mechanical Engineering |
Keywords: | Tsuji burner;Lift-off flame;Recirculation flow |
Issue Date: | 1-Dec-2008 |
Abstract: | 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 |
Journal: | ACTA MECHANICA SINICA |
Volume: | 24 |
Issue: | 6 |
Begin Page: | 645 |
End Page: | 659 |
Appears in Collections: | Articles |
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