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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).

참고문헌 (14)

  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 
  2. Buckmaster, J. D., 2002, 'Edge-flames,' Prog. Energy Combust. Sci. Vol. 28, pp. 435-475 
  3. Buckmaster, J., 2001, 'Large-Lewis-number Instabilities of Model Edge-flames,' Combust. Flame. Vol. 127, pp. 2223-2233 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 

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