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논문 상세정보

화염의 상호작용에 의한 부분 예혼합화염의 화염날림 유속 확대

Nozzle Configurations for Partially Premixed Interacting Jet Flame to Enhance Blowout Limits

Abstract

For the non-premixed interacting jet flames, it has been reported that if eight small nozzles are arranged along the circle of $40{\sim}72$ times the diameter of single jet, the flames are not extinguished even in 200m/s. In this research, experiments were extended to the partially premixed cases to reduce both flame temperature and NOx emission. Nine nozzles were used- eight was evenly located along the perimeter of the imaginary circle and one at the geometric centre. The space between nozzles, S, the equivalence ratio, ${\phi}$, the exit velocity and the role of the jet from the centre nozzle were considered. Normally, flame was lifted and flame base was located inside the imaginary circle made by the nozzle. As nozzles went away from each other, blowout velocity increased and then decreased. The maximum blowout velocity diminished with the addition of air to the fuel stream. When the fuel and/or oxidizer were not fed through the centre nozzle, the maximum blowout velocity obtained by varying S and ${\phi}$ was around 160m/s. Optimum nozzle separation distance at which peak blowout velocity obtained also decreased with ${\phi}$ decrease. Flame base became leaner as approaching to the blowout. It seemed that lots of air was supplied to the flame stabilizing region by the entrainment and partially premixing. To approve this idea and to enhance the blowout velocity, fuel was supplied to the centre region. With the small amount of fuel through the centre nozzle, partially premixed flame could be sustained till sonic velocities. It seemed that the stabilizing mechanism in partially premixed interacting flame was different from that of non-premixed case because one was stabilized by the fuel supply through the centre nozzle but the other destabilized.

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참고문헌 (9)

  1. Roper, F. G., 1977, 'The Prediction of Laminar Jet Diffusion Flame Size: Part 1. Theoretical Model,' Combust. Flame, Vol. 29, pp. 219-226 
  2. Turns, S. R., 1996, An introduction to combustion, McGraw Hill, 2ed. 
  3. Broadwell, J. E., Dahm, W. J. and Mungal, M. G., 1984, 'Blowout of Turbulent Diffusion Flames,' Twenties Symposium (International) on Combustion, The Combustion Institute, pp. 303-310.3 
  4. Kim, H. Y., Chun, C. K., 1991, 'The Interaction of Gaseous Diffusion Flames,' Trans. of the KSME, Vol. 15, No.1, pp. 355-365 
  5. Chun, C. K., 1993, 'Production of NO in Interacting Laminar Diffusion Flames,' Trans. of the KSME, Vol. 17, No.1, pp. 190-199 
  6. Menon, R. and Gollahalli, S. R., 1985, 'Multiple Jet Gas Flames in Still Air,' In Heat Transfer in Fire and Combustion Systems, ASME poblication HTD, Vol. 45, pp. 127-136 
  7. Menon, R. and Gollahalli, S. R., 1988, 'Combustion Characteristics of Interaction Multiple Jets in Cross Flow,' Combustion. Science and Technology, Vol. 60, pp. 375-389 
  8. Lee, S. and Lee, B. J., 2001, 'Characteristics of Interacting Lifted Flames,' Trans. of the KSME(B), Vol. 25, No.4, pp. 461-466 
  9. Kim, J. S. and Lee, B. J., 2003, 'Stability Enhancement by the Interaction of Diffusion Flames,' Trans. of the KSME(B), Vol. 27, NO. 5, pp. 1420-1426 

이 논문을 인용한 문헌 (4)

  1. Kim Jin Hyun ; Lee Byeong-Jun 2005. "Effect of Flame Interaction on the NO Emission" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 29(6): 730~736 
  2. Kim Jin Hyun ; Lee Byeong-Jun 2005. "Characteristics of Methane Non-Premixed Multiple Jet Flames" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 29(3): 349~355 
  3. Lee, Byeong-Jun ; Park, Kyung-Wook 2008. "Effect of Lean-rich Fuel Staging to the Multiple Jet Flames on the Blowout Velocity" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 32(1): 7~14 
  4. Lee, Byeong Jun ; Bae, Chul Han 2014. "Combustion Characteristics of the SOFC Products for SOFC/Gas Turbine Hybrid Power Generation System" 한국연소학회지 = Journal of the Korean Society of Combustion, 19(3): 44~52 

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