지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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The effects of preferential diffusion of hydrogen in interacting counterflow H₂-air and CO-air premixed flames were investigated numerically. The global strain rate was varied in the range 30-5917 s<SUP>-1</SUP>, where the upper bound of this range corresponds to the flame-stretch limit. Preferential diffusion of hydrogen was studied by comparing flame structures for a mixed average diffusivity with those where the diffusivities of H, H₂ and N₂ were assumed to be equal. Flame stability diagrams are presented, which show the mapping of the limits of the concentrations of H₂ and CO as a function of the strain rate. The main oxidation route for CO is CO + O₂ → CO₂ + O, which is characterized by relatively slow chemical kinetics; however, a much faster route, namely CO + OH → CO₂ + H, can be significant, provided that hydrogen from the H₂-air flame is penetrated and then participates in the CO-oxidation. This modifies the flame characteristics in the downstream interaction between the H2-air and CO-air flames, and can cause the interaction characteristics at the rich and lean extinction boundaries not to depend on the Lewis number of the deficient reactant, but rather to depend on chemical interaction between the two flames. Such anomalous behaviors include a partial opening of the upper lean extinction boundary in the interaction between a lean H2-air flame and a lean CO-air flame, as well as the formation of two islands of flame sustainability in a partially premixed configuration with a rich H₂-air flame and a lean CO-air flame. At large strain rates, there are two islands where the flame can survive, depending on the nature of the interaction between the two flames. Furthermore, the preferential diffusion of hydrogen extends both the lean and the rich extinction boundaries.
목차
ABSTRACT
1. 서론
2. 수치해석 및 방법
3. 결과 및 논의
4. 결론
참고문헌
참고문헌 (25)
참고문헌 신청
1. [학술지(정기간행물)] - Fotache CG / 2000 / Ignition of CO/H2/N2 versus heated air in counterflow: experimental and modeling results / Combust Flame 120 : 417 ~ 426
2. [학술지(정기간행물)] - Vagelopoupos CM / 1994 / Laminar flame speeds and extinction strain rates of mixtures of carbon monoxide with hydrogen, methane, and air / Proc Combust Inst 25 : 1317 ~ 1323
3. [학술지(정기간행물)] - Mclean IC / 1994 / The use of carbon monoxide/hydrogen burning velocities to examine the rate of the CO+OH reaction / Proc Combust Inst 25 : 749 ~ 757
4. [학술지(정기간행물)] - Brown MJ / 1996 / Markstein lengths of CO/H2/air flames using expanding spherical flames / Proc Combust Inst 26 : 875 ~ 881
5. [학술지(정기간행물)] - Natarajan J / 2007 / Laminar flame speeds of H2/COmixture effects of CO2 dilution, preheat temperature, andpressure / Combust Flame 151 : 104 ~ 109
2. [학술지(정기간행물)] - Vagelopoupos CM / 1994 / Laminar flame speeds and extinction strain rates of mixtures of carbon monoxide with hydrogen, methane, and air / Proc Combust Inst 25 : 1317 ~ 1323
3. [학술지(정기간행물)] - Mclean IC / 1994 / The use of carbon monoxide/hydrogen burning velocities to examine the rate of the CO+OH reaction / Proc Combust Inst 25 : 749 ~ 757
4. [학술지(정기간행물)] - Brown MJ / 1996 / Markstein lengths of CO/H2/air flames using expanding spherical flames / Proc Combust Inst 26 : 875 ~ 881
5. [학술지(정기간행물)] - Natarajan J / 2007 / Laminar flame speeds of H2/COmixture effects of CO2 dilution, preheat temperature, andpressure / Combust Flame 151 : 104 ~ 109
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UCI(KEPA) : I410-ECN-0101-2015-430-001233613