함정용 디젤 연료와 바이오디젤 연료를 적용한 단기통 디젤엔진에서 연료분사시기가 연소 및 질소산화물 배출특성에 미치는 영향
Effect of fuel injection timing on the combustion and NOx emission characteristics in a single cylinder diesel engine applied with diesel fuel for naval vessel and biodiesel
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본 논문에서는 해군함정의 추진용 디젤엔진의 연료로 사용되는 선박용 디젤연료와 바이오디젤을단기통 엔진에 적용시켜 연료분사시기에 따른 실린더 내 연소특성, 엔진성능 및 질소산화물 배출 특성을 분석하고, 초고속 카메라를 이용하여 선박용 디젤연료와 바이오디젤연료의 연소과정을 분석하는데초점을 두었다. 연료분사시기가 BTDC25oCA에서 BTDC5oCA까지 지각될수록 실린대 내 연소최고압력은점점 떨어졌으나, 토크는 증가하는 경향을 보였다. 질소산화물은 BTDC15oCA에서 가장 높게 측정되었으며, BTDC15oCA를 기준으로 지각 및 진각조건에서는 저감되는 것으로 분석되었다. 연료분사시기가BTDC5oCA일 때 선박용 디젤연료와 바이오디젤연료의 연소과정을 비교한 결과 산소가 포함된 바이오디젤연료의 착화시기가 선박용 디젤연료보다 빠르나, 화염이 확산되어 발달할수록 화염강도는 선박용 디젤연료가 큰 것으로 분석되었다.
Abstract
The objective of this work presented here was focused on analysis of in-cylinder combustion characteristic,engine performance, and nitrogen oxides emission characteristic from marine gas oil for propulsiondiesel engine of naval vessels and biodiesel with fuel injection timing in a single cylinder diesel engine. Inaddition, combustion process was analyzed with a high speed camera of marine gas oil and biodiesel fuel. Retarding the fuel injection timing from BTDC25oCA to BTDC5oCA, in cylinder peak combustion pressurewas gradually decreased, however, engine torque showed a tendency to increase. The highest nitrogen oxideslevel was measured at BTDC15oCA, they were reduced at retarded and advanced condition on the basis ofBTDC15oCA. Comparing with combustion process of marine gas oil and biodiesel fuel at BTDC5oCA, self-ignitiontiming of biodiesel fuel included oxygen content was faster than marine gas oil, however, a cautiousobservation indicates a slightly higher flame intensity for marin gas oil than biodiesel as a diffusion flame isdeveloping.
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