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연료에 조사된 초음파 에너지가 디젤기관의 매연저감에 미치는 영향
이병오(Byoungoh Lee),송용식(Youngsik Song),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the effects of the ultrasonic energy irradiation in diesel fuel on the smoke reduction have been investigated for indirect injection diesel engine. First, in the basis experiment, the aromatics percentages and 90% distillation temperatures of the ultrasonic energy irradiation diesel fuels by analyzing ¹H-NMR spectra and distillation tests reduced more than those of conventional diesel fuels<br/> The total combustion durations and smoke concentrations of diesel fuels irradiated by ultrasonic energy reduced more than those of conventional diesel fuels in the diesel engine tests.<br/>
이병오(Byoungoh Lee),송용식(Youngsik Song),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To effectively meet the current regulations on the exhaust emissions of diesel engine, this study is to investigate the effects the engine performance characteristics and exhaust emission characteristics of ultrasonic reformed diesel fuels in the indirect injection diesel engine.<br/> From the study, following conclusive remarks can be made. <br/> 1) The optimal fuel injection timing of ultrasonic reformed fuels is suitable to be delayed <br/> in comparison with that of conventional fuels. 2) The engine power and the NOx of ultrasonic reformed fuels increase more than those of<br/> conventional fuels, but the bsfc and the smoke of ultrasonic reformed fuels decrease<br/> more than those of conventional fuels.<br/> 3) In case of the retard of fuel injection tinting, the bsfc and the NOx of ultrasonic reformed fuels decrease more than those of conventional fuels.<br/>
초음파 조사 BD20의 디젤기관 적용 시 NOx 저감을 위한 분사지연과 EGR 동시적용 특성에 관한 실험 연구
정영철(Youngchul Jung),임석연(Seokyeon Im),박성영(Sungyoung Park),송용식(Youngsik Song),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
BD containing about 10% oxygen has attracted attention due to soaring oil prices and environmental pollution. The oxygen decreases soot by promoting combustion, but it also increases NOx. To decrease NOx Emission, injection time is delayed or an EGR system is applied so that NOx might be decreased. In that case, engine power is reduced and exhaust gas is raised. However, the fuel is changed physically and chemically, promotes combustion, and thus inhibits such a problem thanks to ultrasonic energy irradiation. Hence, this study was to identify the optimum EGR rate by investigating the engine performance and the characteristics of exhaust substance in accordance with the EGR rate after irradiating ultrasonic energy to BD20 and applying it to modern diesel engine. As a result, with UBD20 (ignition timing of BTDC16°), the optimum EGR rate that can satisfy both engine performance and characteristics of exhaust substance was in the range of 15%.