THERMAL SCIENCE

International Scientific Journal

AN EXPERIMENTAL STUDY OF THE STABILITY OF NATURAL GAS AND PROPANE TURBULENT NON-PREMIXED FLAME UNDER DILUTING CONDITION

ABSTRACT
The stability behavior of a jet diffusion flame developing in a co-flowing stream is studied experimentally, using natural gas and propane as fuel gases. Effects of oxidant and fuel stream velocities and oxidant stream dilution have been studied. The results of experiments showed that with increasing fuel jet Reynolds number, there appears along the flame a point that is accompanied by reaction zone sudden expansion. Flame becomes turbulent downstream from this point. This point is called transition point. More increment of fuel jet Reynolds number moves the transition point to the upstream. Furthermore, two types of stability limits are observed. Blow-off of the rim-stabilized flame is the first stability limit. The second one is the break-off or extinction of the turbulent portion of the flame at the transition point from laminar to turbulent flow. The oxidant and fuel streams are in environmental temperature. In dilution experiments, the oxidant primary stream is oxygen that is diluted with nitrogen or carbon dioxide. In the other experiments oxidant is environmental air.
KEYWORDS
PAPER SUBMITTED: 2011-06-17
PAPER REVISED: 2011-06-25
PAPER ACCEPTED: 2011-09-02
DOI REFERENCE: https://doi.org/10.2298/TSCI110617125K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE 4, PAGES [1055 - 1065]
REFERENCES
  1. Takeno, T., Kotani, Y., An experimental study on the stability of jet diffusion flame, Acta Astronautica,2 (1975), pp. 999-1008
  2. Takeno, T., Kotani, Y., A study on the structure of turbulent jet diffusion flames, Combustion Science and Technology, 10 (1975), pp. 45-57
  3. Takeno, T., Transition and structure of jet diffusion flames, Twenty Fifth Symposium (international) on Combustion, The Combustion Institute, Pittsburgh, Canada, 1992, pp. 1061-1073.
  4. Takeno, T., Kotani, Y., Comments on structure of turbulent jet diffusion flame, Acta Astronautica, 6 (1979), pp. 1009-1010.
  5. T. Takeno, Y. Kotani, An experimental study on stability and combustion characteristics of an excess enthalpy flame, Nineteenth Symposium (international) on Combustion, The Combustion Institute, Pittsburgh, Canada, 1983, pp. 1503-1509.
  6. Wu, C. H., Chao, Y. C., Cheng, T. S., Li, Y. H., Lee, K. Y., Yuan, T., The blowout mechanism of turbulent jet diffusion flames, Combustion and Flame, 145 (2006), pp. 481-494
  7. Idicheria, C. A., Boxx, I. G., Clements, N. T., Characteristics of turbulent non-premixed jet flames under normal- and low-gravity conditions, Combustion and Flame, 138 (2004), pp. 384-400
  8. Pires, A. C., Heitor, M. V., Experimental characterization of non-premixed turbulent jet propane flames, Experimental Thermal Fluid Science, 32 (2000), pp. 115-132
  9. Muniz, L., Mungal, M. G., Effects of heat release and buoyancy on flow structure and entrainment in turbulent non-premixed flames, Combustion and Flame, 126 (2001), pp. 1402-1420
  10. H. Yamashita, M. Shimada, T. Takeno, A numerical study on flame stability at the transition point of jet diffusion flames, Twenty Sixth Symposium (international) on Combustion, Naples, Italy, The combustion institute, 1996, pp. 27-34.
  11. Mizobuchi, Y., Tachibana, S., Shinio, J., Ogawa, S., Takeno, T., A numerical analysis of the structure of a turbulent hydrogen jet lifted flame, Proceeding of Combustion Institute, 29 (2002), pp. 2009-2015
  12. Ruan, J., Kobayashi, H., Niioka, T., Effects of diluents on structure and stability of axisymmetric lifted laminar diffusion flames, 3rd Asian- Pacific Conference on Combustion (ASPACC), Seoul, Korea, 2001.
  13. Sullivan, N., Jensen, A., Glarborg, P., Pope, C. J., Ammonia conversion and NOx formation in laminar co-flowing non-premixed methane-air flames, Combustion and Flame, 131 (2002), pp. 285-295
  14. Kumar, P., Mishra, D. P., Experimental investigating of laminar LPG-H2 jet diffusion flame, International Journal of Hydrogen Energy, 33 (2008), pp. 225-231
  15. Scholefield, D. A., Garside, J. E., Third Symposium (international) on Combustion, The Combustion Institute, Pittsburgh, Canada, 1953, pp. 102-110.
  16. Gaydon, A. G., Wolfhard, H. G., Flames, their Structure, Radiation and Temperature, third edition, Chapman & Hall, 1970
  17. Kuo, K. K., Principles of Combustion, John Wiley & Sons, 1986
  18. H. Tsuji, I. Yamaoka, The counterflow diffusion flame in the forward stagnation region of a porous cylinder, Eleventh Symposium (international) on Combustion, The Combustion Institute, Pittsburgh, Canada, 1967, pp. 979-984.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence