연소실 길이에 따른 이중선회 가스터빈 모델 연소기에서 연소불안정 모드 연구
A Study of Combustion Instability Mode according to the Variation of Combustor Length in Dual Swirl Gas Turbine Model Combustor
4
조회
0
다운로드
7
인용
0
참고문헌
키워드
초록
This study described the experimental investigations of combustion instability in a model gas turbine combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave, which results in a loud and annoyed sound, and may also lead to a structural damage to the combustion system. In this study, in order to examine the combustion instability phenomenon of a dual swirling combustor configuration, the information of heat release and pressure fluctuation period with respect to the variation in both thermal power and combustor length was collected experimentally. As a result, the fundamental acoustic frequency turned out to increase with the increasing thermal power without respect to the combustor length. The frequency response to the combustor length was found to have two distinct regimes. In a higher power regime the frequency significantly decreases with the combustor length, as it is expected from the resonance of gas column. However, in a lower power regime it is almost insensitive to the combustor length. This insensitive response might be a result of the beating phenomenon between the interacting pilot and main flames with different periods.
Abstract
This study described the experimental investigations of combustion instability in a model gas turbine combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave, which results in a loud and annoyed sound, and may also lead to a structural damage to the combustion system. In this study, in order to examine the combustion instability phenomenon of a dual swirling combustor configuration, the information of heat release and pressure fluctuation period with respect to the variation in both thermal power and combustor length was collected experimentally. As a result, the fundamental acoustic frequency turned out to increase with the increasing thermal power without respect to the combustor length. The frequency response to the combustor length was found to have two distinct regimes. In a higher power regime the frequency significantly decreases with the combustor length, as it is expected from the resonance of gas column. However, in a lower power regime it is almost insensitive to the combustor length. This insensitive response might be a result of the beating phenomenon between the interacting pilot and main flames with different periods.
참고문헌 (10)
- Ying Huang, "Dynamics and stability of lean-premixed swirl stabilized combustion", Progress in Energy and Combustion Science, 35, pp.293~364 (2009)
- A.M. Steinberg, "low-flame interactions causing acoustically coupled heat release fluctuations in a thermo - acoustically unstable gas turbine model combustor", Combustion and Flame, 157, pp.2250~2256 (2010)
- 이장수, "모형 가스터빈 연소기에서의 연소 불안정 모드 분석에 관한 실험적 연구", 한국연소학회지, 15(1), pp.12~21 (2010), 한국연소학회
- K. Zahringer, "Helmholtz behavior and transfer function of an industrial fuel swirl burner used in heating systems", International Journal of Heat and Mass Transfer, 46, pp.3539~3548 (2003)
- 오정석, "가스터빈에서의 연소불안정 현상", 한국추진공학회지, 12(4), pp.63~77 (2008), 한국추진공학회
- Lord Rayleigh, "The explanation of certain acoustical phenomena", Notices of the proceedings meetings members of the Royal Institution of Great Britain, 8, pp.536~542 (1878)
- K.T. Kim, "Spatially distributed flame transfer functions for predicting combustion dynamics in lean premixed gas turbine combustors", Combustion and Flame, 157, pp.1718~1730 (2010)
- 최인찬, "PLIF 및 자발광 계측을 이용한 이중선회 가스터빈 연소기에서 연소불안정 모드 연구", 한국연소학회지, 19(1), pp.29~38 (2014), 한국연소학회[DOI]
- David G. Lilley, "Swirl Flows in Combustion : A Review", AIAA Journal, 15(8), pp.1063~1078 (1977)
- N. Syred, "The effect of hydrogen containing Fuel blends upon flashback in swirl burners", Applid Energy, 89(1), pp.106~110 (2012)