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대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제27권 제4호
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    초록·키워드

    An experiment in a turbulent non-premixed flat flame was carried out in order to investigate the effect of swirl number on the flow and combustion characteristics. First, stream lines and velocity distribution in the flow field were obtained using PIV method. In contrast with the axial flow without swirl, highly swirled air induced stream lines along the burner tile, and backward flow was caused by recirculation in the center zone of the flow field. In the combustion, the flame with swirled air also became flat and stable along the burner tile with increment of the swirl number. Flame structure by measuring OH and CH radicals intensity and by calculating Damkohler number(Da) and turbulence Reynolds number(ReT) was examined. It appeared to be comprised in the wrinkled laminar-flame regime. Backward flow by recirculation of the burned gas decreased the flame temperature and emissions concentrations as NO and CO. Consequently、 the stable flat flame with low NO concentration was achieved.

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      UCI(KEPA) : I410-ECN-0101-2009-550-014043554