Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 169-177 |
| Number of pages | 9 |
| Journal | Journal of Thermal Science and Technology |
| Volume | 4 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2009 Dec 1 |
Keywords
- Lifted flame
- Premixed combustion
- Sound and acoustic
- Stability
- Supersonic wave
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Instrumentation
- Engineering (miscellaneous)