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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
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- 지도교수
- 박태선
- 발행연도
- 2015
- 저작권
- 경북대학교 논문은 저작권에 의해 보호받습니다.
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이 논문의 연구 히스토리 (9)
2019
2016
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- 연관 학술논문 또는 학술발표를 통해 보다 발전된 연구결과를 확인하실 수 있습니다.
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초록· 키워드
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본 연구에서는 수소-산소 동축 분사기에 대해 리세스 길이에 변화를 주며 연소해석을 수행하였다. 상용코드인 ANSYS Fluent를 이용해 정상 유동의 난류 연소의 컴퓨터 시뮬레이션을 위해 층류 화염편 모델을 도입하였다. 리세스 효과에 따른 유동의 혼합특성을 분석하기 위해 중심축 상 축방향 속도 및 난류에너지, 재순환 유동, 그리고 혼합도를 살펴보았다. 리세스가 있는 경우의 난류에너지는 리세스가 없는 경우보다 빠르게 발달했고, 연소실 벽면에서 형성되는 재순환 유동의 강도와 크기가 증가했다. 이러한 유동구조의 변동으로 리세스 길이가 증가할수록 수소와 산소의 빠른 혼합을 유도할 것으로 생각된다. 리세스 변화에 따른 연소특성을 알아보기 위해 화학당량 혼합분율과 온도장에 의한 화염크기, 중심축 상 압력의 변화, 수소-산소의 연소 반응물인 물의 유동량을 분석했다. 리세스 길이가 증가할수록 화염길이가 짧아지고 연소 최고온도가 증가하며, 최종생성물인 물의 유동량과 생성량이 증가했다. 리세스가 길어질수록 더 많은 수소와 산소가 반응해 연소효율이 증가하는 것으로 판단된다. 리세스 도입 시 연소가 분사기 내부에서부터 활발히 진행해 연소 시 분사기 내부 압력이 리세스 비 증가에 따라 상승했으며, 이는 리세스 효과를 판단하는 지표로 활용될 수 있을 것이다.
목차
국문초록 ······························································ i목 차 ·································································· iiList of figures ···················································· iii1.서 론 ······························································· 12. 지배방정식과 수치해석 방법 ······························ 32.1 난류 모델 ··············································· 32.2 연소 모델 ··············································· 32.3 상태방정식 ············································· 42.4 해석대상 ················································ 72.5 이산화 및 검증해석 ································· 93. 결과 및 토의 ··················································· 113.1 혼합특성의 변화 ···································· 113.1.1 축방향 속도 및 난류에너지 ·········· 113.1.2 재순환 유동 ······························· 143.1.3 혼합도 ······································· 233.2 연소특성의 변화 ···································· 273.2.1 화염크기 ···································· 273.2.2 압 력 ········································ 333.2.3 화학반응 생성물 ························· 354. 결 론 ····························································· 38참고문헌 ···························································· 39ABSTRACT ························································ 41감사의 말 ··························································· 43
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