Volume 39 Issue 10
Oct.  2013
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Huang Xia, Huang Yong, Gong Fanet al. Anchoring point and blow-off mechanism of Bunsen laminar premixed flame[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(10): 1325-1330. (in Chinese)
Citation: Huang Xia, Huang Yong, Gong Fanet al. Anchoring point and blow-off mechanism of Bunsen laminar premixed flame[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(10): 1325-1330. (in Chinese)

Anchoring point and blow-off mechanism of Bunsen laminar premixed flame

  • Received Date: 18 Dec 2012
  • Publish Date: 30 Oct 2013
  • A velocity-matching method (VM Method) combined with the wall quenching effect was used to analyze the anchoring point movements and the blow-off characteristics of a methane-air laminar premixed Bunsen flame in lean and rich conditions. A blow-off model was achieved and proved by experiments. The flame was anchored in the shearing layer near the burner exit, where the local velocity was equilibrium with the flame speed; there was also an ignition area in the boundary layer. This ignition area was diminished when the flow velocity increased or the equivalence ratio was away from the stoichiometric ratio. When the ignition area became a point, the blow-off occurred. The anchoring point movements were predicted by comparing the local flow velocity and the flame speed, and considering the wall quenching effect in a decoupled method. With the increasing incoming velocity, in radial direction the anchoring point moves towards the jet center line, and in flow direction it moves downstream in fuel-lean conditions and upstream in fuel-rich conditions, respectively. This movement and the ignition area analysis predict the blow-off characteristics, and are validated by experiments. The result shows a good precision and proves the blow-off mechanism.

     

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