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엔진연소실에서 아세톤 형광을 이용한 공연비 측정기법 연구
오승묵(Seungmook Oh),강건용(Kernyong Kang),박승재(Seungjae Park),허환일(HwanilHuh) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Planar laser induced fluorescence(PLIF) has been widely used to obtain two dimensional fuel distribution.<br/> Preliminary investigation was performed tomeasure quantitative air excess ratio distribution in an engine fueled with<br/> LPG. It is known that fluorescence signal from acetone as a fluorescent tracer is less sensitive to oxygen quenching<br/> than other dopants. Acetone was excited by KrF excimer laser (248nm) and its fluorescence image was acquired by<br/> ICCD camera with a cut-off filter to suppress Mie scattering from the laser light. For the purpose of quantifying PLIF<br/> signal, an image processing method including the correction of laser sheet beam profile was suggested. Raw images<br/> were divided by each intensity of laser energy and profile of laser sheet beam. Inhomogeneous fluorescence images<br/> scaled with the reference data, which was taken by a calibration process, were converted to air excess ratio<br/> distribution. This investigation showed instantaneous quantitative measurement of planar air excess ratio distribution<br/> for gaseous fuel.
Chevron 타입 ATF Warmer/cooler의 열유동 특성 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),배석정(Sukjung Bae),이헌균(Heonkyun Lee),이동혁(Donghyeok Lee),김형기(Hyeongki Kim),박승재(Seungjae Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, fuel efficiency during cold FTP mode has been significantly issued. There are two methods to solve the problem. One of the two utilizes an on/off controled water pump which does not operate during cold start. And the other is made use of an exhaust heat recovery module like an ATF warmer/cooler. The purpose of this study is to develop a high efficiency chevron type ATF warmer/cooler which can alternate oil cooler with offset fin. The performance analysis of ATF oil cooler is accomplished by use of computational programs Fluent 6.3. The analyzed results is compared with those of offset fin type oil cooler.