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Analysis of flame shapes in turbulent hydrogen jet flames with coaxial air

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Abstract

This paper addresses the characteristics of flame shapes and flame length in three types of coaxial air flames realizable by varying coaxial air and/or fuel velocity. Forcing coaxial air into turbulent jet flames induces substantial changes in flame shapes and NOx emissions through the complex flow interferences that exist within the mixing region. Mixing enhancement driven by coaxial air results in flame volume decrease, and such a diminished flame volume finally reduces NOx emissions significantly by decreasing NOx formation zone where a fuel/air mixture burns. It is found that mixing in the vicinity of high temperature zone mainly results from the increase of diffusive flux than the convective flux, and that the increase of mass diffusion is amplified as coaxial air is increased. Besides, it is reaffirmed that non-equilibrium chemistry including HO2/H2O2 should be taken into account for NOx prediction and scaling analysis by comparing turbulent combustion models. In addition, it is found that coaxial air can break down the self-similarity law of flames by changing mixing mechanism, and that EINOx scaling parameters based on the self-similarity law of simple jet flames may not be eligible in coaxial air flames.

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References

  1. R. H. Chen and J. F. Driscoll, Twenty-Third Symposium (International) on Combustion, The Combustion Institute, (1990) 281–288.

  2. J. F. Driscoll, R. H. Chen and Y. Yoon, Combust. Flame (88) (1992) 37–49.

  3. J. Y. Chen and W. Kollmann, Combust. Flame, (88) (1992) 397–412.

  4. J. Y. Chen, W. C. Chang and M. Koszykowski, Combust. Sci. and Tech., (1995) 505–529.

  5. M. Schlatter and J. C. Ferreira, Twenty-Sixth Symposium (International) on Combustion, Flury, M., and Gass, J., The Combustion Institute, (1996) 2215–2222.

  6. J. P. H. Sanders, J. Y. Chen and I. Gökalp, Combust. Flame, (111) (1997) 1–15.

  7. S.-H. Kim, Y. Yoon and I.-S. Jeung, Nitrogen Oxides Emissions in Turbulent Hydrogen Jet Nonpremixed Flames: Effects of Coaxial Air and Flame Radiation, Proceedings of Combustion Institute, (28) (2000).

  8. Y. Choi and C. L. Merkle, J. Computational Physics, (105) (1993) 207–223.

  9. J. Warnatz, U. Mass and R. W. Dibble, Combustion, Springer-Verlag Berlin Heidelberg, (1996) 67.

    Google Scholar 

  10. G. Dixon-Lewis, F. A. Goldsworthy and J. B. Greenberg, Proc. R. Soc. Lond. A., (346) (1975) 261–278.

  11. J. J. J. Louis, Turbulent Combustion of Coal Gas, Ph. D. Dissertation, U. of Twente, (1997).

  12. Siegel, Howell, Thermal Radiation Heat Transfer, McGraw Hill (1972).

  13. J. Villermaux, Encyclopedia of Fluid Mechanics, (1986) 707–768.

  14. R. S. Barlow and C. D. Carter, Combust. Flame, (104) (1996) 288–299.

  15. S. B. Pope, An Explanation of the Turbulent Round Jet/Plane Jet Anomaly, AIAA Journal, 16(3) (1978) 279–281.

    Article  MathSciNet  Google Scholar 

  16. W. J. A. Dahm and A. G. Mayman, AIAA J., (28) (1990) 1157–1162.

  17. M. Kim, J. Oh, Y. Yoon and S. Kim, Length Scaling of Turbulent Hydrogen Nonpremixed Jet Flames with Coaxial Air, 32 nd International Symposium on Combustion, Montreal, (2008).

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Authors and Affiliations

  1. School of Aerospace and Mechanical Engineering, Korea Aerospace University, 200-1 Hwajeon-dong, Duckyang-gu, Koyang-shi, Kyungki-do, 412-791, Korea

    Hee-Jang Moon

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Correspondence to Hee-Jang Moon.

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This paper was recommended for publication in revised form by Associate Editor Haecheon Choi

Hee-Jang Moon received his B.S. degree in Aeronautical Engineering from Inha University, Korea in 1986. He then received his M.S. and Doctoral degrees from Universite de Rouen, France in 1988 and 1991, respectively. Dr. Moon is currently a Professor at the School of Aerospace and Mechanical Engineering at Korea Aerospace University in Koyang, Korea. He serves on the Editorial Board of the Korean Society of Propulsion Engineers. His research interests are in the area of turbulent combustion, hybrid rocket combustion and nanofluids.

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Moon, HJ. Analysis of flame shapes in turbulent hydrogen jet flames with coaxial air. J Mech Sci Technol 23, 1743–1750 (2009). https://doi.org/10.1007/s12206-009-0410-8

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  • DOI: https://doi.org/10.1007/s12206-009-0410-8

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