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이호길(Hokil Lee),류정인(Jungin Ryu),김용태(Yongtae Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The regulation for CO₂ emissions from vehicles have become much more stringent in recent years. These more stringent regulations request vehicle manufacturers to develop the alternative fuels for reducing exhaust emissions. The exhaust emission has many sources in vehicle. In this paper. it is discussed that the correlation of CO₂ emission and fuel economy in the LPG and retrofit LPG vehicles using FTP 75 and NEDC(ECE15+EUDC) mode. In order to investigate the affects of CO₂ emission to the fuel economy using existing formula that is carbon balance method, eliminate the emission terms of less contribute relatively to the fuel economy. Computational results are similar more than 99% comparison of the carbon balance method And CO₂ emission of LPG vehicles were low level relatively gasoline and diesel about 7~10%.
[연료 및 윤활유부문] 초음파 처리에 의해 개질된 연료성상이 디젤기관의 대기오염물질에 미치는 영향 (1) - Smoke를 중심으로 -
이병오(Byoungoh Lee),류정인(Jungin Ryu) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The main objective of this study is to investigate reduction of smoke in exhaust emissions from diesel engine by using reformulated diesel fuel by ultrasonic energy adding system.<br/> In order to evaluate the effect of ultrasonic energy and predict the reductive possibility of smoke in exhaust emissions without operating diesel engine, IH-NMR was used to analyze the chemical changes of molecular structure of the ultrasonic energy added diesel fuels compared with that of the conventional diesel fuel, and the 90% distillation temperature was measured to investigate the physical changes of the ultrasonic energy added diesel fuels compared with the conventional diesel fuel.<br/> Based on the investigation results, aromatics fraction ratio in diesel fuels reformulated by ultrasonic energy compared with conventional diesel fuel reduced. and the 90% distillation temperature was decreased the reformulated diesel fuels more than conventional diesel fuel. therefore, the reduction of smoke of reformulated diesel fuels can be estimated<br/>
초음파 개질 경유의 연료특성과 연소특성의 상관성에 관한 연구(Ⅰ) (화학구조와 발열량과의 상관관계)
이병오(Byoungoh Lee),윤면근(Myeongkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The main objective of this study is to investigate the correlation between chemical structure and higher heating value of reformed diesel fuels by ultrasonic irradiation.<br/> In order 10 analyze the chemical changes of molecular structure of the reformed diesel fuels by ultrasonic irrdiation, ¹H-NMR was used and bomb calorimeter was used to analyze the the effect of higher heating values of the ultrasonic energy added diesel fuels to compare with thai of the conventional diesel fuel. The results showed thai the aromatic carbon percentages and higher heating values of the reformed diesel fuels by ultrasonic irradiation increased more than that of the conventional diesel fuel, but the Aromatics percentages and branch indices of those reduced more than that.
표영덕(Youngdug Pyo),권오석(Ohseuk Kwon),김강출(Gangchul Kim),유승훈(Seunghun Yu),류정인(Jungin Ryu),이영재(Youngjae Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dimethyl ether(DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. In the present study, engine performance and exhaust emissions were' investigated with a 8 liter conventional DI diesel engine by using dimethyl ether fuel for development of medium-duty DME bus. Test results showed that the torque and the power with DME were about 70% as those of pure diesel oil, but the brake thermal efficiency decreased a little. Also, smoke index from DME engine showed nearly zero level and NOx was decreased a little compared to diesel oil.
커먼레일용 고압 인젝터의 니들구동방식별 디젤분사특성 해석
배장웅(JangWoong Bae),이진욱(JinWook Lee),강건용(KernYong Kang),류정인(JungIn Ryu) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was performed to verify the spray characteristic of different driven injector in common-rail system. We developed the injector with needle driven by a piezo-electric material, called the piezo injector. The conventional solenoid injector have some limit to control the injection rate even if the common-rail injection system have a good flexibility to adjust the injection pressure and injection timing regardless of direct injection diesel engine's speed and load. To investigate the injection characteristics and needle behavior for different needle driving type of the high pressure common-rail injector, the test rig for injection rate measurement and spray experimental system were used. The injection rate was measured by using an injection rate meter based on the Bosch method. And the spray characteristics such as spray tip penetration, spray tip speed and spray angle were obtained by analyzing the sequential photographs of high speed spray. Results showed the rapid increase in the spray tip penetration was caused by the fast needle movement in piezo injector and rapid rising of injection rate at initial injection stage was observed.
W/O형 유황연료의 안정성 측정을 위한 정전용량 센서개발
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
We designed capacitance sensor for measuring capactance of W/O type emulsified fuel. Capacitance sensor consists of two conductors isolated by an insulator. The characteristics nature of a capacitance sensor is its ability to accept and store an electric charge. From using this concept, we carried out With manufacturing of capacitance sensor, the test results for validity of sensor and stability of 6 emulsified fuel conclude the followings.<br/> The result of capacitance measurement for 6 test fuels indicates design error range is within 4% max, so this fact proves the validity of capacitance sensor.<br/> Capacitance value of 6 emulsified fuel, with the aid of capacitance sensor, increases as water volume increases, but it decreases as surfactant increases when water is given equally.<br/> As a result, cylindrical type capacitance sensor proves validity of sensor and emulsified fuel which produce seperation ratio proves the stability of capacitance value.
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The capacitance sensor design and emulsified fuel manufacturing verify characteristics of emulsified fuel, so it concluded the following conclusions.<br/> The first 24 hours after emulsified fuel manufacturing reveals separation ratio of 1.5%,maintains stable status, and verifies the stability of emulsified fuel.<br/> Adding more water increases the separation ratio rapidly, and adding more surfactant displays stable emulsification using by microscope. 10% added water displays 1㎛ of water droplet diameter distributed on oil droplet, and 30% water does 2㎛, In 6 hours after adding water, I % surfactant mixture makes water diameter 4 to 5 times bigger, and 2% does 2 times, and 3% does 2 times.<br/> In general, adding water makes the density of water diameter bigger, and adding surfactant mixture makes the size of water diameter smaller.<br/> In conclusion, the size of W/O type emulsified fuel water diameter is directly related to the volume of surfactant, and density of water diameter changes the distribution according to water content.
디젤기관 적용 저압형 vortex tube의 에너지 및 Soot분리 특성에 관한 실험 연구
임석연(Sukyeon Im),최정원(Jungwon Choi),오동진(Dongjin oh),최두석(Dusuk Choi),류정인(Jungin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The process of energy and particle separation in a diesel engine using a low pressure vortex tube is studied in detail. The variation of the maximum wall temperature inner surface of the vortex tube and experimental data of the temperature of the hot and cold gas are presented.<br/> In this study outer tube is used for the exhaust application of diesel engine. The hot gas from the vortex tube heats the outside of the vortex tube as it is turning 180°. From this effects in a vortex tube the separation of soot from exhaust gas of diesel engine and the prediction of the ignition of diesel soot are presented by experimental data.<br/>