연소기에서 시간 지연 분석 방법과 Rayleigh 조건을 이용한 연소 불안정 해석 = A Study on Time Lag Analysis and Rayleigh Criterion with Numerical Simulation in a Combustion Chamber

다국어 초록 (Multilingual Abstract)

Combustion instability was numerically and experimentally investigated for the combustor with bluff body. the fuel was perpendicularly injected into air flow and mixed with the air. therefore, premixed mixture was burnt in the combustor. For numerical simulation, the k - ε standard model was used for accounting for turbulence and the hybrid combustion model (eddy dissipation-kinetic model) was applied. The longitudinal mode of approximately 256㎐ was experimentally observed, while the frequency of 253㎐ is numerically derived in limit cycle region. Combustion instability was investigated through time lag analysis and Rayleigh index method. For time lag analysis, the phase difference between pressure and velocity is about 1/4Tf. and that between pressure and heat release is about 1/4Tf. Therefore, the combustion oscillation is consistent with thermoacoustic instability in the combustor with bluff body.

목차 (Table of Contents)

• ABSTRACT
• 서론
• 1. 실험 및 계산방법
• 2. 계산결과 및 고찰
• 3. 결론
• 후기
• 참고문헌