Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Flame Length and EINOx Scaling of Syngas $H_2$/CO Turbulent Non-premixed Jet Flames

$H_2$/CO 합성가스의 비예혼합 난류 제트화염에서 화염 길이와 EINOx 스케일링

  • 황정재 (서울대학교 기계항공공학부) ;
  • 손기태 (서울대학교 기계항공공학부) ;
  • ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Received : 2012.12.05
  • Accepted : 2012.12.11
  • Published : 2012.12.30
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Abstract

The flame lengths and NOx emission characteristics of syngas $H_2$/CO turbulent non-premixed jet flames were investigated. The flame length which is the main parameter governs NOx emission was studied for various syngas compositions. The flame length was compared with previous correlation between Froude number and flame height and it shows that they have good agreements. It was confirmed that the turbulent jet flames herein investigated are in the region of buoyancy-momentum transition. NOx emission was reduced with increased Reynolds number and CO contents in syngas fuel and with decreased fuel nozzle diameter which is attributed by decreased flame residence time. Previous EINOx scaling based on flame residence time of $L_f^3/(d_f^2U_f)$ satisfies only the jet flame in momentum-dominated region, not buoyancy-momentum transition region. The simplified flame residence time ($L_f/U_f$) was adopted in modified EINOx scaling. The modified scaling satisfies the jet flames not only in momentum-dominated region but in buoyancy-momentum transition region. The scaling is also satisfied with $H_2$/CO syngas jet flames.

Keywords

References

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