• 대한기계학회논문집B
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• 제31권6호
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• pp.547-557
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• 2007

This study was conducted to investigate the flow and combustion characteristic of the experimental burner which was manufactured for the reflection of the oven and broil burner features. As slot shape, spacing between slots, and slot arrangement of the exit area which emits the mixing gas are different in case of oven burners and broil turners, the purpose of this study is to know the affection of the flame interaction and combustion characteristic according to the change of shape factors such as slot shape, slot arrangement, and slot-to-slot spacing. With no relation of the slot shape, as the spacing between slots became narrow, the occurrence of a lift-flame was delayed. So the combustion was possible in the leaner region, but the appearance of yellow-tip became a little fast. Slit slot port had the broadest operating range among the other slot shapes. Specially, from the side of lift-flame, as the jet that spreads downstream in the longitudinal slot was nearly circular just a few slot lengths away from the orifice, slot-to-slot spacing of the Slit port was closer than the other ports. These results could be expected through the computer numerical method and had a good agreement. As the spacing between slots increased, in case of Slit and Mix port, NOx emission rate was constant or decreased, but the NOx emission of Hole port was increased. CO emission rate of Slit and Hole port was increased as the slot-to-slot spacing was broadened.

• 한국추진공학회지
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• 제22권1호
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• pp.72-79
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• 2018

초음파 진동자에 의해 미립화된 케로신 분무연소의 OH 라디칼과 CH 라디칼의 자발광 특성을 고찰하기 위한 실험이 수행되었다. ICCD 카메라를 이용하여 분무화염의 자발광 강도를 측정하였으며, 연소 시 소모된 연료량은 정밀유량측정법으로 계측하였다. 그 결과, 연료소모율은 수송기체인 공기 공급유량에 선형적으로 증가하였으며, 분무연소의 특징인 전형적인 그룹 연소가 관찰되었다. OH 라디칼과 CH 라디칼을 분석한 결과, 분사방향으로의 유량 증가에 따라 라디칼 방사강도의 최댓값은 감소하고 그 위치는 후류로 이동하여 반응대의 폭은 증가하였다.