한국해양대학교

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R245fa(C3H3F5)/CH4/O2/N2 혼합물을 사용한 외부로 전파하는 구형화염의 특성에 관한 연구: 부력의 영향에 관한 고찰

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dc.contributor.advisor 최재혁 -
dc.contributor.author 신우중 -
dc.date.accessioned 2019-12-16T02:44:19Z -
dc.date.available 2019-12-16T02:44:19Z -
dc.date.issued 2017 -
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/11460 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002376659 -
dc.description.abstract The incineration characteristics of waste refrigerant in a combustor were investigated via analyses of flame propagating speed, flammability limit and risen behavior of outwardly propagating spherical flames of R245fa/CH4/O2/N2 mixtures. The Schlieren image processing and matlab code were used for the analysis of flame propagating speed. The asymptotic analysis of linear model based on correlation of stretch ratio versus flame propagating speed was applied for the calculation of unstretched flame propagating speed. The calculated unstretched flame propagating speed was sequentially decreased with increasing refrigerant concentration in fuel. The flame propagating speed also dramatically was increased with increasing oxygen concentration in oxidation. Overall flame propagating speed of the R245fa mixtures was faster than that of R134a. As concentration of refrigerant increase, the markstein length which means the instability of flame front became negative and risen behavior by buoyancy on spherical flames was observed. The risen behavior can be classified into typical behavior, transition behavior and buoyancy behavior based on the unstretched flame propagating speed. For the study of the rising behavior through figurative analysis of flames, there was a difference between the side flame radius used to calculate a flame propagating speed and figurative flame radius. These reasons are supported by analysis of deformation and stretch of flame surface by buoyancy. As a result of simulation and correlation for the flame propagating speed versus reactants composition, the uncertainty was increased as the buoyancy effect was increased. In this study, we have confirmed the combustion properties and flammability limits of R245fa/CH4/O2/N2 mixtures and the physical characteristics of risen spherical flames. For comparition with the global warming potentials of reactants and products, the mixed incineration method of collected waste refrigerant gas and methane like R245fa is expected to contribute to the recycling of energy and the reduction of global warming potentials. -
dc.description.tableofcontents 목 차 List of Tables ⅲ List of Figures ⅳ Abstract ⅶ 1. 서 론 1.1 연구배경 1 1.2 외부로 전파하는 구형화염 실험 3 1.3 연구목적 4 2. 실험장치 5 2.1 연소장치 6 2.2 시각화 및 기타 장치 7 3. 실험결과 및 분석 9 3.1 구형화염의 특징 12 3.2 외부로 전파하는 구형화염의 3가지 거동 14 3.3 관찰된 부상거동의 구분 17 3.4 준정상상태 구간의 선정 19 3.5 외부로 전파하는 구형화염의 스트레치 없는 화염전파속도 26 4. 부력의 영향 4.1 부력 영향에 관한 고찰 35 4.2 정확한 스트레치 없는 화염전파속도의 계산 4.2.1 에서 부력의 영향 40 4.2.2 에서 부력 영향의 제거 43 5. 결과의 검증 및 기타 5.1 화염전파속도의 검증 및 불확실성 48 5.2 준정상상태 범위에 관한 고찰 52 5.3 실용적 측면의 기대효과 55 6. 결론 58 참고문헌 60 -
dc.format.extent viii, 62p. -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.rights 한국해양대학교 논문은 저작권에 의해 보호받습니다. -
dc.title R245fa(C3H3F5)/CH4/O2/N2 혼합물을 사용한 외부로 전파하는 구형화염의 특성에 관한 연구: 부력의 영향에 관한 고찰 -
dc.type Dissertation -
dc.date.awarded 2017-08 -
dc.contributor.department 대학원 기관시스템공학과 -
dc.contributor.affiliation 한국해양대학교 -
dc.description.degree Master -
dc.subject.keyword "예혼합 화염", "외부로 전파하는 구형하염", "부력", "화염 퍼짐", R245fa/메탄 연료" -
dc.contributor.specialty 동력기계재료공학전공 -
dc.identifier.holdings 000000001979▲000000007040▲000002376659▲ -
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R245fa(C3H3F5)/CH4/O2/N2 혼합물을 사용한 외부로 전파하는 구형화염의 특성에 관한 연구: 부력의 영향에 관한 고찰.pdf Download

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