Improvement of Laminar Lifted Flame Stability Excited by High-Frequency Acoustic Oscillation
Autor: | Mitsutomo HIROTA, Kota HASHIMOTO, Hiroki OSO, Goro MASUYA |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2009 |
Předmět: | |
Zdroj: | Journal of Thermal Science and Technology, Vol 4, Iss 1, Pp 169-177 (2009) |
Druh dokumentu: | article |
ISSN: | 1880-5566 |
DOI: | 10.1299/jtst.4.169 |
Popis: | A high-frequency (20kHz) standing wave was applied to the unburned mixture upstream of a methane-air lifted jet flame using a bolt-clamped Langevin transducer (BLT) to improve stability. The flow field near the flame was visualized using acetone planar-laser-induced fluorescence (PLIF). The standing wave decreased the lifted flame height and increased the blow-off limit. The upstream flow field of the center jet then bent. This phenomenon appeared when there was a density difference between the center jet and the surrounding secondary flow. When the density of the center jet was less than that of the co-flow, the center jet was redirected to the pressure anti-node side. Conversely, when the density of the center jet was greater than that of the co-flow, the center jet was redirected to the pressure node side. This redirection tended to stabilize the laminar lifted flame. |
Databáze: | Directory of Open Access Journals |
Externí odkaz: |
Pro tento záznam nejsou dostupné žádné jednotky.