Abstract
Particle image velocimetry (PIV) was used to measure velocity fields inside and around oscillating methane-air diffusion flames with a slot fuel orifice. PIV provided velocity and directional information of the flow field comprised of both the flame and air. From this, information on flow paths of entrained air into the flame were obtained and visualized. These show that at low fuel flow rates for which the oscillations were strongest, the responsible mechanism for the oscillating flow appeared to be the repetitive occurrence of flame quenching. PIV findings indicated that quenching appears to be associated primarily with air entrainment. Velocity was found to be considerably larger in regions where quenching occurred. The shedding of vortices in the shear layer occurs immediately outside the boundary of the flame envelope and was speculated to be the primary driving force for air entrainment.
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Acknowledgments
This work was supported by Sandia National Laboratories under Purchase Order 380387. Support by Dr. James Allen with regard to equipment access, and technical advice on data acquisition and data reduction methodology for this study is gratefully acknowledged.
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Yilmaz, N., Lucero, R.E., Donaldson, A.B. et al. Flow characterization of diffusion flame oscillations using particle image velocimetry. Exp Fluids 46, 737–746 (2009). https://doi.org/10.1007/s00348-008-0605-2
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DOI: https://doi.org/10.1007/s00348-008-0605-2