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Behaviors of Flame and Flow of Swirling Wake During Fuel Jet Oscillation Due to Acoustic Excitations

  • M. E. Loretero (a1) and R. F. Huang (a1)

Abstract

The flame and flow behaviors along with the fuel jet oscillations of non-premixed and axisymmetric swirling wake during acoustic excitations are studied experimentally. Visual observations on the reaction zones are carried out to identify the flame behaviors. Close-up images at the flame base as well as the whole flame images are captured and discussed. Traditional photography techniques are adopted to illustrate the dimensional characteristics of every flame mode. The central jet oscillations are diagnosed by a two component laser Doppler anemometer. Combined images of the flame and flow are gathered using the laser-light sheet assisted Mie scattering method. Results showed that the short and wide flame which was induced during acoustic forcing is principally because of the severe premixing at the tip of the burner tube. Wake recirculation bubble enhanced premixing at low swirl number while it damped the jet oscillation at higher swirl number. Mechanics of mixing at every flame mode during acoustic excitation are reported and discussed.

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* Graduate student
** Professor, corresponding author

References

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1.Gupta, A. K., Lilley, D. G. and Syred, N, Swirl Flows, Abacus Press, Cambridge, USA, pp. 13117 (1984).
2.Sheen, H. J., Chen, W. J. and Jeng, S. Y., “Recirculation Zones of Unconfined and Confined Annular Swirling Jets,” American Institute of Aeronautics and Astronautics Journal, 34, pp. 572579 (1996).
3.Huang, R. F. and Tsai, F. C, “Observations of Swirling Flows Behind Circular Discs,” American Institute of Aeronautics and Astronautics Journal, 39, pp. 11061112(2001).
4.Huang, R. F. and Yen, S. C, “Aerodynamic Characteristics and Thermal Structure of Non-premixed Reacting Swirling Wakes at Low Reynolds Numbers,” Combust. Flame, 155, pp. 539556 (2008).
5.Kim, T. K., Park, J. and Shih, H. D., “Mixing Mechanism Near the Nozzle Exit in a Tone Excited Nonpremixed Jet Flame,” Combustion Science and Technology, 89, pp. 83100 (1993).
6.Baillot, F and Demare, D., “Physical Mechanisms of Lifted Non-premixed Flame Stabilized in an Acoustic Field,” Combustion Science and Technology, 174, pp. 7398 (2002).
7.Lakshminarasimhan, K., Ryan, M. D., Clemens, N. T. and Ezekoye, O. A., “Mixing Characteristics in Strongly Forced Non-premixed Methane Jet Flames,” Proceedings Combustion Institute, 31, pp. 16171624 (2007).
8.Lee, K. M, Kim, T. K., Kim, W. J., Kim, S. G., Park, J. and Keel, S. N, “A Visual Study on Flame Behavior in Tone-excited Non-premixed Jet Flames,” Fuel, 81, pp. 22492255 (2002).
9.Pan, K. L., “Flame Propagation with Hydrodynamic Instability in Vortical Flows,” Journal of Mechanics 24, pp.277284 (2008).
10.Chao, Y. C, Wu, C. Y., Yuan, T. and Cheng, T. S., “Stabilization Process of a Lifted Flame Tuned by Acoustic Excitation,” Combustion Science and Technology, 174, pp. 87110(2002).
11.Wu, C. Y., Chao, Y. C, Cheng, T. S., Li, Y. H., Lee, K. Y. and Yuan, T., “The Blowout Mechanism of Turbulent Jet Diffusion Flames,” Combust. Flame, 145, pp. 481494 (2006).
12.Chao, Y. C, Yuan, T. and Tseng, C. S., “Effects of Flame Lifting and Acoustic Excitation on the Reduction of NOx Emissions,” Combustion Science and Technology, 113, pp. 4965(1996).
13.Demare, D. and Baillot, F., “Acoustic Enhancement of Combustion in Lifted Non-premixed Jet Flames,” Combust. Flame, 139, pp. 312328 (2004).
14.Ginevsky, A. S., Vlasov, Y. V. and Karavosov, R. K., Acoustic Control of Turbulent Jets, Springer-Verlag Berlin Heidelberg, pp. 3399 (2004).
15.Kinsler, L. E. and Frey, A. R., Fundamentals of Acoustics 2nd Ed., Wiley, pp. 247293, New York (1982).
16.Hjelmfelt, A. T. and Mockros, L. F., “Motion of Discrete Particles in a Turbulent Fluid,” Applied Science Research, 16, pp. 149154(1966).
17.Fujii, S. and Eguchi, K., “Comparison of Cold and Reacting Flows Around a Bluff-body Flame Stabilizer,” Journal of Fluids Engineering, Transactions of ASME, 103, pp. 328334(1981).
18.Eaton, A. R, Frey, S. F., Cusano, D. M., Plesniak, M. W. and Sojka, P. E., “Development of a Full-field Planar Mei Scattering Technique for Evaluating Swirling Mixers,” Experiments inFluids, 21, pp. 325330 (1996).

Keywords

Behaviors of Flame and Flow of Swirling Wake During Fuel Jet Oscillation Due to Acoustic Excitations

  • M. E. Loretero (a1) and R. F. Huang (a1)

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