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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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- 2022
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최근 가스터빈 및 내연기관 등 CO2 배기가스에 대한 규제가 심해지고 있는 가운데 수소가 신재생 에너지로 각광받고있다. 하지만 수소연소에 있어 몇가지 단점이 존재하는데 넓은 가연한계, 높은 연소속도에 의한 역화 현상 그리고 높은 연소온도에 의해 thermal NOx가 많이 배출된다는 것이다. 이러한 기술적 문제를 해결하기 위하여 다수의 micro화염의 의해 화염안전성과 저 NOx를 실현 할 연소 기술이 연구되고 있다. 본 연구에서는 원통형의 연소실에서 Micro flame jet in cross-flow burner에 대한 연구를 통해 micro 연료 출구 직경과 Recess Length를 변화시키며 화염의 안정성과 NOx 저감특성에 대한 수치해석을 진행한 후 NOx배출 결과를 토대로 burner를 설계하였고 실험을 통해서 NOx 배출 저감 특성을 분석하였다. 우선 수치해석을 통해서 micro 화염을 통한 NOx배출 저감을 위해서는 momentum ratio(J)가 지배적인 영향을 미치고 있음을 알 수 있었다. Recess Length가 연소 특성에 영향을 주지만 공기-연료의 혼합에 대한 부수적인 영향으로 연소에 도움을 주지만 직접적인 영향은 아니라고 판단했다. Momentum ratio에 대한 변화를 더욱 극적으로 변화시키며 특성을 파악하고자 직경이 서로 다른 연소기3개를 제작하여 실험을 진행하였다. 실험을 통해서 cross-flow dominated mode가 micro 화염에 의한 NOx배출이 적은 flow pattern임을 알 수 있었다.
목차
목 차국문초록…………………………………………………………………………………… i목 차…………………………………………………………………………………… ii표 목 차…………………………………………………………………………………… iii그림목차…………………………………………………………………………………… vi제 1 장 서 론1.1연구배경 및 동향 ···································································· 11.2 연구목적 ··············································································· 3제 2 장 수치해석2.1 지배방정식 ············································································ 52.2 버너 시스템 ··········································································· 62.2.1 수치해석방법······························································ 62.2.2 모델과 경계 조건 ························································ 62.2.3 Momentum ratio(J) ······················································· 102.3 수치해석의 실험적 검증 ························································· 112.4 수치해석 결과 ······································································ 142.4.1 연료 출구직경 변화 결과 ··········································· 142.4.2 Recess Length 변화 결과 ·············································· 15제 3 장 실험3.1 실험장치 및 실험방법 ···························································· 243.1.1 micromix burner ··························································· 243.1.2 실험방법 ·································································· 243.2 실험 결과 ············································································ 293.2.1 화염 특성 ································································ 293.2.2 실험 결과 ································································ 33제 4 장 결론 ···················································································· 38참고 문헌 ·························································································· 39ABSTRACT ························································································ 41감사의 말 ·························································································· 42
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