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남충우,김현철,김재광,박문제,남유주 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.7
Fossil fuel phase-out is a main issue which should be solved for all sector of mobility. Especially for the aviation sector, a hydrogen fuel cell-based aircraft is under development according to its inevitable emission effect and in following to carbon offsetting and reduction scheme for international aviation(CORSIA) by international civil aviation organization. In this study, shape change of hydrogen supply valve has been experimented with flow and magnetic field analysis under aviation running circumstances. Comparing to a normal vehicle driving, aviation is running under different circumstances such as altitude, temperature, pressure and etc. K-epsilon model has been used for the numerical analysis. With redesigning suction force about 10 % and spring constant, it has been improved for hysteresis deviation of hydrogen supply va
사용 후 커먼레일 디젤엔진의 고장분석 및 재제조 기술을 적용한 성능 비교
남충우(Chungwoo Nam),이호길(Hokil Lee),김현준(Hyunjun Kim),김락민(Rakmin Kim),정도현,송현석(Hyunseok Song),하치상(Chisang Ha),강춘길(Chunkil Kang) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
In this paper, operating characteristics and history of old 2.5L Common Rail Direct Injection(CRDI) diesel engine were investigated. With this base research, possible failure mode causes and effects analysis were performed. General four causes of diesel engine failure are from coolant, engine oil, abrasion, and consumables, But mainly 95% of failure are caused by coolant and engine oil. Therefore, performance of used engine and remanufactured engine from used one was analyzed with maximum power, maximum torque, combustion efficiency, brake specific fuel consumption(BSFC) and thermal efficiency. Hyundai`s A-engine which is one of 2.5L diesel engines was experimented on engine dynamometer. In the experiment, exhaust gas and output torque were measured at whole torque range. As a result, maximum power and torque of remanufactured engine were improved 23.65% at 3800rpm and 5.23% at 2000rpm each compared with used engine. Also, combustion efficiency, BSFC, and thermal efficiency were improved. By utilizing engine failure mode analysis, it is possible to establish more organized remanufacturing techniques and process, so resources could be used in an effective way.