PLIF를 이용한 이중 선회 가스터빈 연소기의 과도 및 불안정 모드 연구 = Study of the Transition and Instability Mode by PLIF in a Dual Swirl Gas Turbine Combustor

다국어 초록 (Multilingual Abstract)

This paper described experimental investigations of the transition and instability mode in a lean premixed dual swirl combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead to a structural damage to the combustion chamber. Heat release analysis in instability and transition mode has been examined with OH and CH-PLIF system. flame tomography with operated at 10kHz. Experiment results suggest that unstable flame behavior has a specific frequency with 200Hz and this frequency is accords with 1/2 subhamonic of resonance frequency, not fundamental frequency. Also, it is confirmed that the combustion instability is strongly related to the CIVB phenomenon.