• OpenAccess
  • Cold-State Investigation on a Flame Holder  [CPME 2013]
  • DOI: 10.4236/jpee.2013.17008   PP.45 - 50
  • Author(s)
  • Yiqing Du
  • Slitty bluff body is widely used as a high-performance flame holder in power industry. To understand the flame stability mechanism, the evolution of the near wake over a slitty bluff body in cold state was numerically investigated using the renormalization group (RNG) k-ε model at Reynolds number of 470,000. The coherent structure of the near wake was identified by the vortex shedding simulation. To explain the vortex shedding, a mechanism that single vortex of large size suddenly immerses two shear layers was proposed. To quantitatively compare the near wakes at different gap ratio, a vortex shedding character dimension was first proposed. This character dimension has positive correlation with flame stability. Particle-image velocimetry (PIV) measurements in a close wind tunnel were also carried out to confirm the observation from the numerical study. The evidence shows that the numerical results are of good agreement with the cold-state experiments.

  • Flame Holder; Bluff Body; Flame Stability; Coherent Structure; Vortex Shedding
  • References
  • [1]
    J. T. Yang and G. L. Tsai,“Near Wake Flow of a V Gutter with Slit Bleed,”Journal of Fluids Engineering, Vol. 115, No. 1, 1993, pp. 13-20.
    C. R. Anderson, “On the Accurate Calculation of Vortex Shedding,” Physics of Fluids, Vol. 2, No. 6, 1990, pp. 883-885.
    D. G. E. Grigoiadis and J. G. Bartzis, “LES of the Flow Past a Rectangular Cylinder Using the Immersed Boundary Concept,” International Journal for Numerical Methods in Fluids, Vol. 41, No. 6, 2003, pp. 615-632.

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