커먼레일 디젤엔진의 운전조건이 나노크기 입자상 물질 배출특성에 미치는 영향에 관한 실험적 연구
Experimental Investigation of Nano-sized Particulate Matter Emission Characteristics under Engine Operating Conditions from Common Rail Diesel Engine
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초록
본 논문은 커먼레일 디젤엔진의 정속운전시 배출되는 나노크기의 입자상 물질을 분석하는데 초점을 두었다. 디젤산화촉매 후단에서 나노입자상 물질의 개수농도 저감수준은 크지 않았으나 매연여과장치 후단에서 분석한 결과 1,000배 정도 저감되는 결과를 확인하였다. 고속 · 고부하 조건에서는 매연여과장치의 자연재생 효과로 인해 입자상 물질은 증가하였다. 연료분사시기를 BTDC 6oCA 에서 ATDC 4oCA까지 지각시킨 결과 입자상 물질의 개수농도는 감소하였지만 최지각 조건인 ATDC 9oCA에서는 증가하는 결과를 확인하였다. EGR 적용시 핵화모드 입자상 물질은 저감되는 경향을 보였으며 축적모든 입자는 증가하였다.
Abstract
The objective of this work presented here was experimental study of steadystate and cold start exhaust nano-sized particle characteristics from common rail diesel engine. The effect of the diesel oxidation catalyst (DOC) on the particle number reduction was insignificant, however, particle number concentration levels were reduced by 3 orders of magnitude into the downstream of diesel particulate filter (DPF). In high speed and load conditions, natural regeneration of trapped particle occurred inside DPF and it was referable to increase particle number concentration. As fuel injection timing was shifted BTDC 6oCA to ATDC 4oCA, particle number concentration level was slightly reduced,however particle number and size was increased at ATDC 9oCA. Nucleation type particle reduced and accumulation type particle was increased on EGR condition.
참고문헌 (10)
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