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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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The effects of strain rate and preferential diffusion of H2 on flame extinction are numerically studied in interacting premixed syngas-air flames with fuel compositions of 50% H₂ + 50% CO and 30% H₂ + 70% CO. Flame stability diagrams mapping lower and upper limit fuel concentrations at flame extinction as a function of strain rate are examined. Increasing strain rate reduces the boundaries of both flammable lean and rich fuel concentrations and produces a flammable island and subsequently even a point, implying that there exists a limit strain rate over which interacting flame cannot be sustained anymore. Even if effective Lewis numbers are slightly larger than unity on extinction boundaries, the shape of the lean extinction boundary is slanted even at low strain rate, i.e. ag = 30 s<SUP>-1</SUP> and is more slanted in further increase of strain rate, implying that flame interaction on lean extinction boundary is strong and thus hydrogen (as a deficient reactant) Lewis number much less than unity plays an important role of flame interaction. It is also shown that effects of preferential diffusion of H2 cause flame interaction to be stronger on lean extinction boundaries and weaker on rich extinction boundaries. Detailed analyses are made through the comparison between flame structures with and without the restriction of the diffusivities of H2 and H in symmetric and asymmetric fuel compositions. The reduction of flammable fuel compositions in increase of strain rate suggests that the mechanism of flame extinction is significant conductive heat loss from the stronger flame to ambience.
목차
ABSTRACT
1. 서론
2. 수치해석 및 방법
3. 결과 및 논의
4. 결론
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참고문헌
참고문헌 (29)
참고문헌 신청
1. [학술대회논문] - Vagelopoupos CM / 1994 / Laminar flame speed and extinction strain rates of mixtures of carbon monoxide with hydrogen, methane, and air / Proc Combust Inst. 25 : 1317 ~ 1323
2. [학술지(정기간행물)] - Fortache CG / 2000 / Ignition of CO/H2/N2 versus heated air in counterflow: experimental and modelingresults / Combust Flame 120 : 417 ~ 426
3. [학술지(정기간행물)] - Park J / 2009 / Chemical effects on added CO2 on the extinction characteristics of H2/CO/CO2syngas diffusion flames / Int J Hydrogen Energy 34 : 8756 ~ 8762
4. [학술지(정기간행물)] - 김정수 / 200908 / Effects of hydrocarbon addition on cellular instabilities in expanding syngas-air spherical premixed flames / INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 : 6961 ~ 6969
5. [학술지(정기간행물)] - Vu TM / 2010 / Effects of Diluents on Cellular Instabilites in Outwardly Propagating Spherical Syngas-Air Premixed Flames / Int J Hydrogen Energy 35 : 3868 ~ 3880
2. [학술지(정기간행물)] - Fortache CG / 2000 / Ignition of CO/H2/N2 versus heated air in counterflow: experimental and modelingresults / Combust Flame 120 : 417 ~ 426
3. [학술지(정기간행물)] - Park J / 2009 / Chemical effects on added CO2 on the extinction characteristics of H2/CO/CO2syngas diffusion flames / Int J Hydrogen Energy 34 : 8756 ~ 8762
4. [학술지(정기간행물)] - 김정수 / 200908 / Effects of hydrocarbon addition on cellular instabilities in expanding syngas-air spherical premixed flames / INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 : 6961 ~ 6969
5. [학술지(정기간행물)] - Vu TM / 2010 / Effects of Diluents on Cellular Instabilites in Outwardly Propagating Spherical Syngas-Air Premixed Flames / Int J Hydrogen Energy 35 : 3868 ~ 3880
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UCI(KEPA) : I410-ECN-0101-2014-431-001338736