지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2021
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이 논문의 연구 히스토리 (3)
2021
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초록· 키워드
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The 1D network modeling method predicts combustion instability by considering only the acoustic elements of the actual combustor. Since this method takes less time and cost for computation, it is very helpful in identifying combustion instability characteristics through various case studies.
In this paper, using a transfer function-based analytical model, major factors influencing the acoustics and combustion instability in a two-duct system composed of a nozzle and a combustor were derived and their quantitative effects were evaluated. From the acoustic analysis, it was confirmed that the change in reflection coefficient and mean flow could have a great influence on the instability growth rate. Contrary to the expectation that n, which is the gain of flame transfer function in a combustion instability system, will be the dominant factor determining instability, the area ratio and speed of sound ratio between the nozzle and the combustor are also key parameters to determine combustion instability as well as flame transfer function.
A single can combustor has the advantage of being simple in shape, but it is far from the shape of the gas turbine actually used. Can-annular combustors are the most widely used structure in industrial gas turbines. Acoustic interaction through crosstalk in a can-annular combustor affects combustion instability that cannot be ignored. In this study, a basic analytical study was conducted to develop a combustion instability analysis model in a general can-annular combustor. The acoustic transfer function of a single can combustor based on impedance was derived. From this, the acoustic transfer function of the 4-can multiple combustion system could be obtained while sequentially increasing the number of cans. Then, through comparative verification of the developed 1D analysis model and 3D FEM and experimental data, we prove that the 1D model is valid.
In this paper, using a transfer function-based analytical model, major factors influencing the acoustics and combustion instability in a two-duct system composed of a nozzle and a combustor were derived and their quantitative effects were evaluated. From the acoustic analysis, it was confirmed that the change in reflection coefficient and mean flow could have a great influence on the instability growth rate. Contrary to the expectation that n, which is the gain of flame transfer function in a combustion instability system, will be the dominant factor determining instability, the area ratio and speed of sound ratio between the nozzle and the combustor are also key parameters to determine combustion instability as well as flame transfer function.
A single can combustor has the advantage of being simple in shape, but it is far from the shape of the gas turbine actually used. Can-annular combustors are the most widely used structure in industrial gas turbines. Acoustic interaction through crosstalk in a can-annular combustor affects combustion instability that cannot be ignored. In this study, a basic analytical study was conducted to develop a combustion instability analysis model in a general can-annular combustor. The acoustic transfer function of a single can combustor based on impedance was derived. From this, the acoustic transfer function of the 4-can multiple combustion system could be obtained while sequentially increasing the number of cans. Then, through comparative verification of the developed 1D analysis model and 3D FEM and experimental data, we prove that the 1D model is valid.
목차
1. 서론 ·························································································································· 11.1 연소불안정 ································································································ 11.2 연소불안정 예측 기법 ·············································································· 31.3 네트워크 모델 ·························································································· 51.4 다중 캔 연소 시스템 ·············································································· 81.5 연구 목적 ···································································································· 92. 연구방법 ·················································································································· 112.1 폐회로 피드백 열음향 불안정 모델링 ·············································· 112.2 단일 연소기의 음향전달함수 모델링 ·················································· 122.2.1 음향전달함수 해석 ········································································· 172.2.2 연소불안정 시스템 해석 ······························································· 192.3 다중 캔 연소기의 시스템 음향전달함수 모델링 ······························ 222.3.1 단일 캔 연소기 음향전달함수 모델링 ········································· 222.3.2 다중 캔 연소기의 음향전달함수 모델링 ? ······················ 272.3.3 다중 캔 연소기의 음향전달함수 모델링 ? ···················· 303. 해석 연소기의 연구 결과 및 고찰 ·································································· 353.1 단일 연소기의 시스템 해석 결과 ······················································ 353.1.1 음향 시스템 해석 결과 ··································································· 353.1.2 연소불안정성 해석 결과 ······························································· 403.2 다중 캔 시스템의 시스템 해석 결과 ················································ 433.2.1 해석 대상 연소기 ··········································································· 433.2.2 2-can 시스템 해석 결과 ································································ 453.2.2 4-can 시스템 해석 결과 ································································ 514. 결론 ························································································································ 59참고 문헌 ··················································································································· 61
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