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바이오디젤유를 이용한 CRDI방식 디젤기관의 흡기포트내 선회기 적용 특성에 관한 연구
임석연(Seokyeon Im),정영철(Youngchul Jung),오동진(Dongjin Oh),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
This study aims to investigate the property of engine performance and the material property of exhaust gasby application of the intake swirler. The fuel of BDF 20 was made by mixing 80% of diesel fuel and 20% of biodiesel fuel. These fuels were used and tested in the diesel engine of CRDI type used currently. The swirler was made by streamlined shape to lessen the intake resistance, The three types of its wing angle are 20°, 40° and 60°. From experimental results, we found that the characteristics of engine performance, soot was effective in wing angle of 20° and NOx was effective in 60°.
커먼레일 디젤기관의 인터쿨러 대체용 볼텍스 튜브 장치의 성능특성에 관한 실험 연구
임석연(Seokyeon Im),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.3
An object of this study is to confirm performance characteristics of the vortex tube apparatus for substitution of the intercooler in a common-rail diesel engine. The turbo pressure, the intake air flow rate and the ΔTc decrease ratio of the intercooler were measured in a experimental engine. The vortex tube apparatus was made after confirmation of the geometric phenomena in fundamental experiments. To investigate energy separation characteristics of the vortex tube, the measured turbo pressure was applied to the vortex tube inlet and the ΔTc decrease ratio was compared with one of the intercooler in the cold air mass flow ratio similar to the intake air flow rate of the experimental engine. From the results, we found that the energy separation ratio is increased according to of the inlet pressure and the ΔTc decrease ratio of the vortex tube apparatus is higher than one of the intercooler at low engine speed and engine load of medium and low.
초음파 에너지 조사 시간과 분사지연에 따른 BD20의 디젤기관 연소특성에 관한 실험 연구
임석연(Seokyeon Im),조성철(Sungchul Jung),정영철(Youngchul Jung),박성영(Sungyoung Park),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An object of this study is to understand the correlation between the characteristics of an engine performance and combustion, applying BD20 fuel reformed by ultrasonic energy irradiation to diesel engines. Before conducting the main experiment, an experiment was performed to determine the optimum injection timimg of the fuel used in applying the ultrasonic energy irradiation to BD20. To control the duration of the ultrasonic energy irradiation, the capacity of an ultrasonic energy fuel supply system was tested with 550㏄ and 1100㏄ chambers. As the result of the analysis of the regular BD20 and BD20 to which ultrasonic energy irradiation was applied, the BSFC and the Power of the irradiated BD20 was improved 3% and 6%, respectively compared to those of non-irradiated BD20. When the fuel injection timing was delayed by 5°, the engine power was improved by 3%, and the BSFC was improved by 2%. The maximum combustion pressure of irradiated BD20 was improved by a maximum of 6% in comparison to that of regular BD20, and demonstrated a synergistic effect of 3% by delaying the injection timing 5°.
Boidiesel 혼합연료의 초음파 에너지 조사 시간에 따른 물리적ㆍ화학적 특성에 관한 실험 연구
임석연(Seokyeon Im),송용식(Yongsik Song),정영철(Youngchul Jung),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to understand the physical and chemical characteristics of Biodiesel blended fuel that is reformed by ultrasonic energy irradiation. To understand the characteristics, the mixing of commercial diesel fuel and biodiesel was compared and analyzed according to whether or not ultrasonic energy irradiationwas performed and also the duration of irradiation. The result of the experiments indicates that when ultrasonic energy irradiation was performed on biodiesel blended fuel, its viscosity decreased by 3~7%. In the case of BD20, when the ultrasonic energy irradiation was performed, its sauter mean diameter(SMD) dropped by 12% on average. As the irradiation time increased, the volume ratio of olefins increased up to a maximum 2.7%, and the Higher heating value increased to a maximum of 5.8%. On the contrary, the ratio of aromatics decreased by a maximum 2.7%, and BI decreased by a maximum of 7%.
초음파 조사 바이오디젤 혼합연료의 Common-rail형 디젤기관 적용 특성에 관한 연구
임석연(Seokyeon Im),정영철(Youngchul Jung),박성영(Sungyoung Park),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This is an experimental study on characteristics of engine performance and discharged materials in common-rail type diesel engine. The bio-diesel fuel is mixed with the diesel fuel in common use at the ratio of 20% or 100%. The diesel fuel and blended fuel is irradiated by ultrasonic wave energy. The diesel fuel, blended fuel, reformed diesel fuel and reformed blended fuel by ultrasonic wave energy is applied to the experimental engine individually. The results are compared with one of the diesel fuel in common use and analyzed.
볼텍스 튜브의 에너지 분리효율 최적화를 위한 기하학적 형상 연구
임석연(Seokyeon Im),유상석(Sangseok Yu) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Vortex tubes are used in many industrial fields as parts for refrigerating machines due to their many intrinsic benefits. Although the use of these types of tubes has become common, the characteristics of energy separation associated with these tubes have yet to be vigorously researched. In this study, a counter-flow type of vortex tube is employed to investigate the energy separation characteristics with various geometric configurations. A parametric study was conducted to evaluate the performance of the vortex tube with various geometric structures and operating inlet pressures. The results show that variation of the cold exit orifice hole diameter significantly influences the energy separation between two exits.
초음파 에너지 조사 시간과 분사지연에 따른 BD20의 디젤기관 연소특성에 관한 실험 연구
임석연(Seokyeon Im),이호길(Hogil Lee),류정인(Jeongin Ryu) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.4
An object of this study is to understand the correlation between the characteristics of an engine performance and combustion characteristics, applying BD20 fuel reformed by ultrasonic energy irradiation to diesel engines. Before conducting the main experiment, an experiment was performed to determine the optimum injection timimg of reformed BD20 by ultrasonic energy irradiation. To control the duration of the ultrasonic energy irradiation, the capacity of an ultrasonic energy fuel supply system was tested with 550cc and 1100cc chambers. As the result of the analysis of the regular BD20 and reformed BD20 by ultrasonic energy irradiation, the BSFC and the Power of the reformed BD20 was improved 3% and 6%, respectively compared to those of non-irradiated BD20. When the fuel injection timing was delayed by 5°, the engine power was improved by 3%, and the BSFC was improved by 2%. The maximum cylinder pressure of reformed BD20 was improved by a maximum of 6% in comparison to that of regular BD20, and demonstrated a synergistic effect of 3% by delaying the injection timing 5°.