Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
권호 표지

Soot Formation Characteristics on the Instability of Laminar Diffusion Flames

층류확산화염의 불안정성에 대한 매연생성 특성의 역할

  • Received : 2010.09.05
  • Accepted : 2010.09.24
  • Published : 2010.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, soot formation characteristics on the instability of laminar diffusion flames were investigated experimentally using a concentric co-flow burner. When a small amount of air was supplied through an inner nozzle, a stable propane laminar diffusion flame became unstable and began to oscillate mainly due to the dilution effect. The increase of air flow rate transformed an oscillating non-sooting flame into a stable nonsooting flame. When the air flow rate was continuously increased an inner flame was formed and the flame was changed to an oscillating sooting flame, an oscillating non-sooting flame and finally a stable non-sooting hollow flame. When the air flow rate was decreased, a non-sooting hollow flame was eventually changed back to a stable non-sooting flame. The presence of an inner flame, however, altered the soot formation characteristics of a flame. More soot production was observed with the presence of an inner flame. The increased or decreased soot formation/oxidation rates, the radiation heat loss, and the heating effect of inner flames are most likely to be responsible for the observed instability of laminar diffusion flames.

Keywords

References

  1. Chen, L. D., Seaba, J. P., Roquemore, W. M. and Goss, L. P., "Buoyant diffusion flames", Symposium(International) on Combustion, Vol. 22, Issue 1, 1988, pp. 677-684
  2. Thevenin, D., Renard, P. H., Fiechtner, G. J., Gord, J. R. and Rolon, J. C., "Regimes of nonpremixed flame-vortex interactions", Symposium(International) on Combustion, Vol. 28, Issue 2, 2000, pp. 2101-2108
  3. Renard, P. H., Thevenin, D., Rolon, J. C. and Candel, S., "Dynamics of flame/vortex interactions", Progress in Energy and Combustion Science, Vol. 26, 2000, pp. 225-282 https://doi.org/10.1016/S0360-1285(00)00002-2
  4. Pan, K. L., Qian, J., Law, C. K. and Shyy, W., "The role of hydrodynamic instability in flamevortex interaction", Proceedings of the Combustion Institute, Vol. 29, Issue 2, 2002, pp. 1695-1704 https://doi.org/10.1016/S1540-7489(02)80208-5
  5. Davis, R. W., Moore, E. F., Santoro, R. J. and Ness, J. R., "Isolation of buoyancy effects in jet diffusion flame experiments", Combustion Science and Technology, Vol. 73, 1990, pp. 625-635 https://doi.org/10.1080/00102209008951674
  6. Katta, V. R., Roquemore, W. M., Menon, M., Lee, S. Y., Santoro, R. J. and Litzinger, T. A., "Impact of soot on flame flicker", Proceedings of the Combustion Institute, Vol. 32, Issue 1, 2009, pp. 1343-1350 https://doi.org/10.1016/j.proci.2008.06.152
  7. Shaddix, C. R., Williams, T. C., Blevins, L. G., and Schefer, R. W., "Flame structure of steady and pulsed sooting inverse jet diffusion flames", Proceedings of the Combustion Institute, Vol. 30, Issue 1, 2005, pp. 1501-1508 https://doi.org/10.1016/j.proci.2004.08.244
  8. 남연우, 배승만, 이원남 "화염의 유동장과 온도에 따른 동축류 확산화염의 불안정 특성", 제 40회 KOSCO Symposium 논문집, 2010, pp. 47-52
  9. 이원남, "동축류 확산화염의 매연생성에 미치는 연료에 첨가된 산화제의 영향", 한국연소학회지, 제3권, 제1호, 1998, pp. 11-19
  10. 남연우, 이원남, "Ratio pyrometry를 이용한 매연 입자 온도 계측에 대한 고찰", 제 29회 KOSCO Symposium 논문집, 2004, pp. 124-129
  11. 이원남, "매연 및 온도 분포에 따른 이색법 확산화염온도의 오차", 산업기술연구, 제3권, 단 국대학교 산업기술연구소, 2003, pp. 63-74
  12. $G\ddot{u}lder$, O. L. and Snelling, D. R., "Influence of nitrogen dilution and flame temperature on soot formation in diffusion flames", Combustion and Flame, Vol. 92, 1993, pp. 115-124 https://doi.org/10.1016/0010-2180(93)90202-E
  13. 강희곤, 이원남, "확산화염 매연생산에 미치는 회석제 및 산화제의 영향", 대한기계학회 학술대회, 제1권, 제2호, 1996, pp. 548-553
  14. 이원남, 정용현, "매연입자 온도 측정에 의한 확산화염의 매연생성 특성 해석", 제 19회 KOSCO Symposium, 1999, pp. 241-249
  15. 남연우, 이원남, "Modulated LII 신호와 이색법을 이용한 매연입자 온도 계측", 제 33회 KOSCO Symposium, 2006, pp. 110-116
  16. 이교우, 정종수, 황정호, "동축 이중 에틸렌 확산화염의 매연 농도분포 및 온도 측정", 대한기계학회 논문집 B권, 제26권, 제3호, 2002, pp. 402-409
  17. Sidebotham, G. W. and Glassman, I., "Flame temperature, fuel structure, and fuel concentration effects on soot formation in inverse diffusion flames", Combustion and Flame, Vol. 90, 1992, pp. 269-272 https://doi.org/10.1016/0010-2180(92)90088-7
  18. 정종수, 이교우, "동축 이중 확산화염에 대한 중앙 공기제트 유동의 영향", 대한기계학회 학술대회, 제1권, 제2호, 1997, pp. 37-42