Flame stabilization in the wake flow behind a slit V-gutter

✍ Scribed by Jing-Tang Yang; Chang-Wu Yen; Go-Long Tsai

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 806 KB
• Volume: 99
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(94)90133-3

✦ Synopsis

The features of flame stabilization of a V-shaped flame holder with a slit at the leading edge have been investigated by flow visualization and measurements of velocity, turbulence intensity, pressure, and temperature in the near wake. The results indicate that the stable operating limits of the flame holder were significantly improved at an optimal ratio of the slit width to the span width of the flame holder. The mechanism that kept the flame stabilized over the slit V-gutter is different from the traditional one. Observation of the flow showed that a diverted flame sheet was generated between two wings and merged gradually with the adjacent reacting shear layer to form a lumped flame kernel, which remained stable in the wake region. A jet-flame-like structure produced in the lower reacting layer and the recirculation zone shifted upward in the near wake. The turbulence intensity in the core of the near wake was increased by the effect of the diverted jet through the slit. The flame configurations provided extra thermal energy to sustain the flame and resulted in a local maximum temperature that enhanced combustion in fuel-rich conditions. All evidence indicates that the slit V-gutter extends the operating limits of the flame holder and is more stable than the traditional one.