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대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제28권 제7호
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    초록·키워드

    In this paper, the study of effects of flow parameters on flame structure and NOx emission concentration was performed in co-axial laminar partially premixed methane/air flames Such flow parameters as equivalence ratio(φ), fuel split percentage(σ), and mixing distance(x/D₁) were defined as a premixing degree and varied within φ=1.36~9.52, σ=50-100, and (x/D₁)=5 -20 The Image of OH* and NOx concentration were obtained with an ICCD camera and a NOx analyzer The flame structure observations show a categorization of partially premixed flames into three distinct flame regimes corresponding to φ<1.7(premixed flame structure), 1 7<φ<3 3(hybrid structure), and φ>33(diffusion flame structure existing a luminous sooting region) at 0=75%, and x/D₁=10 As σ decreases from 100% to 50%, and x/D₁ decreases, nonpremixed flame structure appear at low equivalence ratio relatively In addition, the measured emissions for NOx rise steeply from 41=1 7, to 41=3 3, then constants φ>476 NOx emissions decrease with Increase the level of premxing level. In conclusion, the main effect on flame structure and NOx production was at first equivalence ratto(φ), and next fuel split percentage(σ), and finally mixing distance(x/D₁).

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      UCI(KEPA) : I410-ECN-0101-2009-550-014426055