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고압에서 예혼합 CH<sub>4</sub>-Air 화염의 축소 반응 메카니즘
이수각,이기용,Lee, Su-Gak,Lee, Ki-Yong 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
에러 최소 연결 방법(SEM-CM) 및 반복적 화학종 제거 민감도를 적용한 반응 메카니즘 감소 방법을 갖고, 고압에서 메탄-공기 예혼합 화염에 대한 축소 반응 메카니즘을 개발하였다. 최대 5% 이내의 에러 조건에서 얻어진 축소 반응 매카니즘은 43개 화학종과 554개 기초반응식으로 구성되어 있다. 고압조건에서 다양한 초기온도, 당량비를 갖는 메탄-공기 화염에 대하여 상세 화학반응 메카니즘과 축소 반응 메카니즘으로부터 얻어진 화염구조는 비교되었고, 결과는 잘 일치하였다. 따라서 개발된 축소 반응 메카니즘은 고압에서 화염속도, 화염온도, 주 화학종 및 부 화학종의 농도 등을 재생할 수 있다. A short reaction mechanism for premixed $CH_4$-air flames at high pressure was developed using a reduction method based on the combined application of the simulation error minimization connectivity method and the iterative species-removal sensitivity method. It consisted of 43 species and 554 elementary reactions under the condition that it produces less than 5% of the maximum error. The flame structures obtained using a detailed reaction mechanism and the short reaction mechanism were compared for $CH_4$-air flames with various initial temperatures and equivalence ratios at high pressure, and the results were in good agreement. Therefore, the short reaction mechanism developed could reproduce the flame speeds, temperatures, and concentrations of major and minor species at high pressure.
고압조건에서 예혼합 CH₄-Air 화염의 축소 반응 메카니즘
이수각(Su Gak Lee),이기용(Ki Yong Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
A short reaction mechanism for premixed CH₄-Air flames under high pressure was developed with a reduction method of the combined application of Simulation Error Minimization Connectivity Method and iterative species-removal sensitivity. It consisted of 42 species and 472 elementary reactions at the condition of less than 5% of maximum error. For CH₄-Air flame with the various of initial temperature and equivalence ratio at high pressure, the flame structures from a detailed reaction mechanism and a short reaction mechanism were compared, the results of which were in good agreement. So the short reaction mechanism could reproduce flame speeds, temperature, the concentration of major and minor species at the pressure of 5 atm.
고압에서 예혼합 CH₄-Air 화염의 축소 반응 메카니즘
이수각(Su Gak Lee),이기용(Ki Yong Lee) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
에러 최소 연결 방법(SEM-CM) 및 반복적 화학종 제거 민감도를 적용한 반응 메카니즘 감소 방법을 갖고, 고압에서 메탄-공기 예혼합 화염에 대한 축소 반응 메카니즘을 개발하였다. 최대 5% 이내의 에러 조건에서 얻어진 축소 반응 매카니즘은 43개 화학종과 554개 기초반응식으로 구성되어 있다. 고압조건에서 다양한 초기온도, 당량비를 갖는 메탄-공기 화염에 대하여 상세 화학반응 메카니즘과 축소 반응 메카니즘으로부터 얻어진 화염구조는 비교되었고, 결과는 잘 일치하였다. 따라서 개발된 축소 반응 메카니즘은 고압에서 화염속도, 화염온도, 주 화학종 및 부 화학종의 농도 등을 재생할 수 있다. A short reaction mechanism for premixed CH4-air flames at high pressure was developed using a reduction method based on the combined application of the simulation error minimization connectivity method and the iterative species-removal sensitivity method. It consisted of 43 species and 554 elementary reactions under the condition that it produces less than 5% of the maximum error. The flame structures obtained using a detailed reaction mechanism and the short reaction mechanism were compared for CH₄-air flames with various initial temperatures and equivalence ratios at high pressure, and the results were in good agreement. Therefore, the short reaction mechanism developed could reproduce the flame speeds, temperatures, and concentrations of major and minor species at high pressure.
2층 광장 화재시 에어커튼을 이용한 방연특성 분석을 위한 3차원 수치해석 연구
이수각(Su-Gak Lee),김정엽(Jung-Yup, Kim) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Amidst the buildings in urban area that tend to be larger and higher, safety becomes more vulnerable to the fire, particularly in large scale buildings which might cause more severe damage in fire. To deal with such vulnerability, the study on smoke protection using air curtain has been on the rise in foreign countries whereas domestic effort has still been far behind. Thus air curtain was selected as the measure to prevent smoke spread in large buildings and numerical analysis using ANSYS CFX was conducted.
이수각(Su Gak Lee),이기용(Ki Yong Lee) 한국연소학회 2014 한국연소학회지 Vol.19 No.1
Spherically expanding flames are used to measure flame speeds, which are derived the corresponding laminar flame speeds at zero stretch. Dimethyl Ether-Air mixtures at high pressure are studied over an extensive range of equivalence ratios. The classical shadowgraph technique is used to detect the reaction zone. In analytical methodology the optimization process using least mean squares is performed to extract the laminar flame speeds. It is seen that the laminar flame speed of DME-Air mixture with the increase of pressure decreases rapidly showing a similar trend to other hydrocarbon fuels. At pressure of 2 and 10 atm the experimental data from the present study agree well with results reported in the literature. Especially the laminar flame speeds at 2 atm are in good agreement with those calculated in numerical work over the full stoichiometric range. At elevated pressure of 12 atm the measured data are slightly slower at fuel lean condition and show close agreement at fuel rich condition when compared with the numerical results.