Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Oscillatory Instability of Low Strain Rate Edge Flame

저신장율 에지 화염의 진동 불안정성

  • 김강태 (순천대학교 기계자동차공학부) ;
  • 박준성 (순천대학교 기계자동차공학부) ;
  • 김정수 (순천대학교 기계자동차공학부) ;
  • 오창보 (한국기계연구원 에너지기계연구센터) ;
  • 길상인 (한국기계연구원 청정환경기계연구센터) ;
  • 박정 (순천대학교 기계자동차공학부)
  • Published : 2006.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Systematic experiments in $CH_4/Air$ counterflow diffusion flames diluted with He have been undertaken to study the oscillatory instability in which lateral flame size was less than burner nozzle diameter and thus lateral heat loss could be remarkable at low global strain rate. The oscillatory instability arises for Lewis numbers greater than unity and occurs near extinction condition. The oscillation is the direct outcome from the advancing and retreating edge flame. The dynamic behaviors of extinction in this configuration can be classified into three modes; growing, harmonic and decaying oscillation mode near extinction. As the global strain rate decreases, the amplitude of the oscillation becomes larger. This is caused by the increase of lateral heat loss which can be confirmed by the reduction of lateral flame size. Oscillatory edge flame instabilities at low global strain rate are shown to be closely associated with not only Lewis number but also heat loss (radiation and lateral heat loss).

Keywords

References

  1. Thatcher, R. W. and Dold, J. W., 2000, 'Edge of Flames That do not Exist: Flame-edge Dynamics in a Nonpremixed Counterflow,' Combust. Theory Modelling, Vol. 4, pp. 435-457 https://doi.org/10.1088/1364-7830/4/4/304
  2. Buckmaster, J. D., 2002, 'Edge-flames,' Prog. Energy Combust. Sci. Vol. 28, pp. 435-475 https://doi.org/10.1016/S0360-1285(02)00008-4
  3. Buckmaster, J., 2001, 'Large-Lewis-number Instabilities of Model Edge-flames,' Combust. Flame. Vol. 127, pp. 2223-2233 https://doi.org/10.1016/S0010-2180(01)00324-8
  4. Kirkby, L. L. and Schmitz, R. A., 1966, 'An Analytical Study of the Stability of a Laminar Diffusion Flame,' Combust. Flame, Vol. 10, pp. 205-220 https://doi.org/10.1016/0010-2180(66)90077-0
  5. Kim, J. S., 1997, 'Linear Analysis of the Diffusional-thermal Instability of Diffusion Flames with Lewis Number Close to Unity,' Combust. Theory Modelling, Vol. 1, pp. 13-40 https://doi.org/10.1080/713665228
  6. Jacono, D. L., Papas, P. and Monkewitz, P. A., 2003, 'Cell Formation in Non-premixed, Axisymmetric Jet Flame Near Extinction,' Combust. Theory Modelling, Vol. 7, pp. 635-644 https://doi.org/10.1088/1364-7830/7/4/302
  7. Cheatham, S. and Matalon, M., 1996, 'Heat Loss and Lewis Number Effects on the Onset of Oscillations in Diffusion Flames,' Twenty-sixth Symposium (international) on combustion/The combustion institute, pp. 1063-1070
  8. Sohn, C. H., Chung, S. H. and Kim J. S., 1999, 'Instbility-induced Extinction of Diffusion Flames Established in the Stagnant Mixing Layer,' Combust. Flame, Vol. 117, pp. 404-412 https://doi.org/10.1016/S0010-2180(98)00088-1
  9. Sohn, C. H., Kim J. S., Chung, S. H. and Maruta, k., 2000, 'Nonlinear Evolution of Diffusion Flame Oscillations Triggered by Radiative Heat Loss,' Combust. Flame, Vol. 123, pp. 95-106 https://doi.org/10.1016/S0010-2180(00)00148-6
  10. Christiansen, E. W., Tse, S. D. and Law, C. K., 2000, 'A Computational Study of Oscillatory Extinction of Spherical Diffusion Flames,' Combust. Flame, Vol. 134, pp. 327-337 https://doi.org/10.1016/S0010-2180(03)00112-3
  11. Park, J., Oh, C. B., Kim, K. T., Kim, J. S. and Hamins, A., 2005, 'Multi-dimensional Effects on Low Strain Rate Flame Extinction in Methane/air Counterflow Non-premixed Flames,' 5th Asia-Pacific Conference on Combustion, pp. 345-348
  12. Chellian, H. K., Law, C. K., Ueda, T., Smooke, M. D. and Williams, F. A., 1990, 'An Experimental and Theoretical Investigation of the Dilution, Pressure and Flow-field Effects on the Extinction Condition of Methane-air-nitrogen Diffusion Flames,' Proceedings of the 23nd international Symposium on Combustion, The Combustion Institute, 503
  13. Park, J., Hwang D. J., Lee, K. H., Chung, J. O., Keel, S. I. and Lee, S. B., 2004, 'Comparative Study of Flame Structures and NOx Emission Characteristics in FIR and FGR Combustion System,' International Journal of Energy Research, Vol. 28, pp. 861-885 https://doi.org/10.1002/er.1001
  14. Lutz, A.E., Kee, R. J., Grear, J. F. and Rupley, F. M., 1997, 'OPPDIF : A Fortran Program for Computing Opposed-flow Diffusion Flames,' sandia Report SAND 96-8243