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Flame liftoff height dependence on geometrically modified bluffbodies in a vitiated flow

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Abstract

In this study, the improvement of liftoff height of bluffbody-stabilized, partially premixed methane flames and the change of flow field in the recirculation zone of bluffbodies, of variously modified base geometries, are investigated in a high temperature (~1,315 K) vitiated flow. The basic geometry of the bluffbody consists of a two-dimensional rectangular body with a rounded nose with fuel jets being discharged from the body at several locations upstream of the base. Flame liftoff height measurements are characterized by CH chemiluminescence, while the three-dimensional flow field is determined using stereo particle image velocimetry (PIV). The lowest liftoff height is observed when the geometric modifications from the original rectangular bluffbody base are carried out such that the base has three-dimensional local cavities together with two-dimensionally modified geometries. PIV measurements show that the improvement of liftoff height is primarily attributed to an intense recirculation induced by multi-dimensional vortex structures in the presence of the two- and three-dimensionally modified base.

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Acknowledgments

This work is sponsored by the AFOSR/STTR Program with Cascade Technologies Inc.—Stability Models for Augmentor Design Tools and Technology Assessment, with Julian Tishkoff as the Technical Monitor. The authors would like to thank Prof. R. Dibble at U.C. Berkeley for providing the premixed burner and Prof. Heinz Pitsch for useful discussion.

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Authors and Affiliations

  1. Mechanical Engineering Department, Stanford University, Stanford, CA, 94305-3032, USA

    Wookyung Kim, Seong-kyun Im, Hyungrok Do & M. Godfrey Mungal

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  1. Wookyung Kim
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  2. Seong-kyun Im
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  3. Hyungrok Do
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  4. M. Godfrey Mungal
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Correspondence to M. Godfrey Mungal.

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Kim, W., Im, Sk., Do, H. et al. Flame liftoff height dependence on geometrically modified bluffbodies in a vitiated flow. Exp Fluids 49, 27–41 (2010). https://doi.org/10.1007/s00348-009-0733-3

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  • DOI: https://doi.org/10.1007/s00348-009-0733-3

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