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
- 지도교수
- 김홍집
- 발행연도
- 2015
- 저작권
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Combustion instability is a well-known phenomenon which takes place in a closed chamber such as a combustion chamber of rockets. This phenomenon should be studied consistently because it can have a serious damage on the combustion chamber and engine system.
Acoustic cavity has been widely used as a stabilization device to suppress the combustion instability. Damping capacity of acoustic cavity has been elucidated according to various geometric shapes. A Rijke tube facility has been used which can simulate interaction heat and acoustic field very simply.
The damping capacity for various changes in orifice diameter and orifice length and the number of the acoustic cavity was experimentally evaluated. Acoustic cavities having large orifice area showed better damping capacity. But, in case of orifice length, the longer orifice length above a certain value makes cavity volume and resultant acoustic stiffness too smaller, so damping capacity was decrease above this threshold-like specific length. As for the number of cavities, damping capacity increases with the number, but, in a certain number or more, the significant increase of the damping capacity was not observed. As for acoustic cavities which were thought to have large damping capacity, decay time has been measured to quantify the damping capability in time domain. Effects of orifice area on decay time was much higher than those of orifice length.
Results from heat-acoustic field interaction through Rijke tube shows that the pure acoustic approach would not be sufficient for the fine tuning of acoustic cavity and further combustion tests would also be necessary to optimize the shape and number of the cavity for optimal design acoustic cavity.
Acoustic cavity has been widely used as a stabilization device to suppress the combustion instability. Damping capacity of acoustic cavity has been elucidated according to various geometric shapes. A Rijke tube facility has been used which can simulate interaction heat and acoustic field very simply.
The damping capacity for various changes in orifice diameter and orifice length and the number of the acoustic cavity was experimentally evaluated. Acoustic cavities having large orifice area showed better damping capacity. But, in case of orifice length, the longer orifice length above a certain value makes cavity volume and resultant acoustic stiffness too smaller, so damping capacity was decrease above this threshold-like specific length. As for the number of cavities, damping capacity increases with the number, but, in a certain number or more, the significant increase of the damping capacity was not observed. As for acoustic cavities which were thought to have large damping capacity, decay time has been measured to quantify the damping capability in time domain. Effects of orifice area on decay time was much higher than those of orifice length.
Results from heat-acoustic field interaction through Rijke tube shows that the pure acoustic approach would not be sufficient for the fine tuning of acoustic cavity and further combustion tests would also be necessary to optimize the shape and number of the cavity for optimal design acoustic cavity.
목차
Ⅰ. 서 론 11.1 연구 배경 11.2 연구 목적 및 필요성 2Ⅱ. 이론적 배경 42.1 Rijke Tube 42.1.1 Rayleigh 기준 62.2 연소불안정 제어 92.2.1 음향공 10Ⅲ. 실험장치 및 실험방법 133.1 실험장치 133.1.1 연료공급부 및 열원부 143.1.2 Rijke Tube 173.1.3 음향공 및 Orifice 213.1.4 데이터수집 및 제어 253.2 실험방법 28Ⅳ. 실험결과 및 분석 304.1 Rijke Tube 공진 주파수 304.2 음향공 감쇠 특성 비교 314.2.1 Orifice의 직경(면적)에 따른 감쇠 능력 비교 324.2.2 Orifice의 길이에 따른 감쇠 능력 비교 344.2.3 음향공의 개수에 따른 감쇠 능력 비교 374.3 완전 감쇠 영역 음향공의 Decay Time 비교 40Ⅴ. 결론 44Ⅵ. 참고문헌 46ABSTRACT 48
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