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조기현,정형길 한국기계기술학회 2009 한국기계기술학회지 Vol.11 No.2
This study was carried out to investigate of the performance for Sweet potato Harvester using Power-tiller. There was highly reduction in energy consumption using by Sweet potato Harvester of Power-tiller. A diesel engine with four cycle with single cylinder, water cooling and rated output 8.1 kW/2200 rpm was selected. The experimental factors for performance test, engine speed ranged from 1000 rpm to 2400 rpm, and BSFC, efficiency, traction power, and vibration were measured. The results obtained were as follows; engine output were increased from 4.4 kW to 5.74 kW at 1800 rpm and increased to 8.83 kW at 2400 rpm The specific fuel consumption was decreased to 320 g/kW.h at engine speed 2200 rpm and the traction power were showed 420~440 kgf.
소형 SI 기관용 연료로서 가솔린과 LPG의 특성 비교에 관한 연구
조기현,백태실,정형길 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.4
This is a fundamental study to improve the performance of the LPG engine. The result were summarized as followed. 1. The measured torque and power on the fuel of LPG were indicated about 8% lower than those on gasoline with the same compression ratio. 2. In the case of LPG, BSFD at compression ratio of 9.7 was about 5% lower than that of 8.3 at 3,000ppm 3. HC and CO concentrations of the LPG were lower about 53%, 35% than those of gasoline
폐식용유를 사용한 디젤기관에서의 LPG 공급에 의한 성능개선에 관한 연구
조기현,황의현,백태실,정형길 한국마린엔지니어링학회 2000 한국마린엔지니어링학회지 Vol.24 No.5
In this study, using frying oil, performance of engine and emission concentration were compared with the case of using diesel oil. And results are as follows. 1. Engine torque and brake horse power indicate nearly same value as the case of using diesel fuel. 2. Temperature of exhaust gas was increased with as high engine speed and load. 3. To reduce concentration of hydrocarbon, it is effective to operate using used frying oil in low engine speed and load, and adding LPG in high engine speed and load. 4. Concerning with concentration of carbon mono oxide and smoke emission, it was assured, that as engine load increased, lower concentration emitted in case of utilizing mixed fuel than that of utilizing pure diesel fuel.