가스터빈 연소기에서 CO2* 배경 강도가 OH* 및 CH* 화학 발광 강도에 미치는 영향
CO2* Background Effect on OH* and CH* Chemiluminescence Intensities in a Gas Turbine Combustor
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The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO2* background level in the CH* and OH* band. The test results show that the effect of CO2* level in the CH* band is greater than that in the OH* band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio,almost regardless of a change in the inlet velocity.
Abstract
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO2* background level in the CH* and OH* band. The test results show that the effect of CO2* level in the CH* band is greater than that in the OH* band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio,almost regardless of a change in the inlet velocity.
참고문헌 (5)
- Balachandran,R, "Experimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations", Combustion and Flame, 143, pp.37~55 (2005)
- Chemiluminescence measurement and modeling in syngas,methane and jet-A fueled combustor, "Venkata N.Nori", AIAA, ~, pp.paper AIAA-2007- 0466 (2007)
- Jun Kojima, "Basic asspects of OH(A),CH(A),and C2(d)chemiluminescence in the reaction zone of laminar methane-air premixed flames", Combustion and Flame, 140, pp.34~45 (2005)
- Lee,J.G, "Experimental diagnostics for the study of combustion instabilities in lean premixed combustors", Journal of Propulsion and Power,, 19, pp.735~750 (2003)
- Kim,D., "Effect of flame structure on the flame transfer function in a premixed gas turbine combustor", ,Journal of Engineering for Gas Turbine and Power,, (132) (2010)