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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 이기만
- 발행연도
- 2023
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초록· 키워드
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Low-swirl combustion(LSC) is proposed as one kind of
lean-premixed combustion concept that can be applied to various
industrial combustor. LSC has complex dynamic characteristics of
lifting flames despite their strong emission performance compared to
typical swirl-stabilized flames. In this study, the thermo-acoustic
instability characteristics of LSC is investigated by model gas turbine
combustor. To compare of dynamic behavior in typical swirl-stabilized
high-swirl combustion(HSC) and LSC, we performed lots of
measurements of self-excited instabilities in each experimental
condition with variable of equivalence ratio, combustor length and
injector type. The results shown that longitudinal instability occurred
dominantly in model gas turbine combustor. Also, HSC and LSC
indicate similar unstable behavior in far downstream combustor length
region. But, in specific experimental conditions, there are strong
deviation in two types of combustor. Experimental results will be
described in non-linear time series form as well as time series form.
Additionally, SPOD and DMD analysis were performed by using of
mie-scattering images.
lean-premixed combustion concept that can be applied to various
industrial combustor. LSC has complex dynamic characteristics of
lifting flames despite their strong emission performance compared to
typical swirl-stabilized flames. In this study, the thermo-acoustic
instability characteristics of LSC is investigated by model gas turbine
combustor. To compare of dynamic behavior in typical swirl-stabilized
high-swirl combustion(HSC) and LSC, we performed lots of
measurements of self-excited instabilities in each experimental
condition with variable of equivalence ratio, combustor length and
injector type. The results shown that longitudinal instability occurred
dominantly in model gas turbine combustor. Also, HSC and LSC
indicate similar unstable behavior in far downstream combustor length
region. But, in specific experimental conditions, there are strong
deviation in two types of combustor. Experimental results will be
described in non-linear time series form as well as time series form.
Additionally, SPOD and DMD analysis were performed by using of
mie-scattering images.
목차
Ⅰ.서 론 11. 1. 연구 배경 11. 2. 연구동향 31. 2. 1. 저선회 연소 (Low-swirl combustion) 31. 2. 2. 열-음향 불안정성 (Thermo-acoustic instability) 51. 3. 연구 목적 8Ⅱ. 실험장치 및 방법 92. 1. 실험 장치 92. 2. 1. 저선회 리그 (Low-swirl test rig) 92. 2. 2. 저선회 인젝터 (Low-swirl injector) 102. 2. 실험 방법 14Ⅲ. 실험 결과 및 고찰 153. 1. 화염 안정화 특성 153. 1. 1. 안정화 선도 (Stability map) 163. 2. 저선회 화염 불안정성 특성 203. 2. 1. 연소실 길이에 따른 연소 불안정성 특성 203. 2. 2. 주파수 기반 신호 해석 283. 3. 비선형 시계열 분석 (Non-linear time series analysis) 373. 3. 1. 위상 공간 재구성 (Phase space reconstruction) 373. 3. 2. 재귀 분석 (Recurrence analysis) 433. 4. SPOD (Spectral Proper Orthogonal Decomposition) 분석 473. 4. 1. 한계주기 진동 모드 SPOD 분석 결과 483. 4. 2. 분기 모드 SPOD 분석 결과 52Ⅳ. 결론 64
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