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초음파 개질 경유의 연료특성과 연소특성의 상관관계에 관한 연구(Ⅱ)
이병오(Byoungoh Lee),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.1
In order to analyze the effect of the chemical structure and the cetane number of reformed diesel fuels by ultrasonic energy irradiation, proton nuclear magnetic resonance spectrometer('H-NMR) was used.<br/> From the study, following conclusive remarks can be made.<br/> l) Branch Index(BI), aromatics percentages, and alpha methyl radical(Hα) of the reformed diesel fuels by ultrasonic energy irradiation decreased more than the conventional ones.<br/> 2) All the cetane numbers which were calculated from carbon type structure and hydrogen type distribution of the reformed diesel fuels increased more than the conventional ones.<br/> 3) It is more reasonable to predict cetane number equation from carbon type structure than from hydrogen type distribution.<br/> 4) BI, aromatics percentages, and Hα on both for conventional fuel and reformed diesel fuels by ultrasonic energy irradiation are inversely proportional to cetane number for these fuels.
마이크로 열병합발전용 10kW급 천연가스엔진의 성능 최적화
이창준(Changjun Lee),류정인(Jeongin Ryu),오시덕(Sideok Oh),표영덕(Youngdug Pyo),이영재(Youngjae Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Cogeneration is an energy conversion process, where electricity and useful heat are produced simultaneously in one process. Also, carbon dioxide emissions can be reduced as well. The cogeneration process may be based on the use of steam, gas turbines or combustion engines. However, there have been few models with an output of less than 100 kilowatt. In the present study, a spark ignited gas engine with generation output of 10 kilowatts was developed for micro cogeneration package. The gas engine shows 29.2% of thermal efficiency under Stoichiometric combustion and 33.6% of thermal efficiency under lean combustion. NOx emission shows less than 10ppm at 13% oxygen under stoichiometric combustion and about<br/> 100ppm at 13% oxygen under lean combustion.
하이브리드 전기자동차의 운전조건에 따른 제어 특성 연구
여운석(Unseuk Yeo),류정인(Jeongin Ryu),김강출(Gangchul Kim),이영재(Youngjae Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid electric vehicles (HEVs) combine the internal combustion engine and the electric motor generator with battery system, resulting in improved fuel economy and lower exhaust emissions compared to conventional vehicles. In the present study, HEV control characteristics are analyzed for the Toyota Prius. To accomplish this, vehicle speed, engine speed, battery current and voltage, SOC(State of Charge), motor speed and torque, generator speed and torque, and engine coolant temperature etc. are measured in real time. Tests are carried out on chassis dynamometer and on-road driving under various test conditions such as different initial SOC(SOC 40%, SOC 56%, and SOC 80%) and different driving patterns.<br/>
소형 고속 연료분사 엔진의 SCV 이용 저속성능향상 연구
이승진(Seungjin Lee),류정인(Jeongin Ryu),조규백(Gyubaek Cho),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fuel injection system has more benefits in power, fuel consumption and emission than carburetor system even in high speed small engine. Up to date fuel injection system and SCV is used in motor car but is not used in motorcycles in Korea. Fuel injection system which has ECM can control precise fuel supply to variable rpm in engine and SCV is possible to increase engine performance at low rpm. The purpose of this study is the investigation of effects of fuel injection system and SCV to improve the engine performance and efficiency in variable revolution of high speed small engine which is 4 Valves SOHC single cylinder engine used in motorcycle.
소형 가솔린 엔진의 VVT적용을 위한 엔진 성능 기초 연구
이승진(Seungjin Lee),류정인(Jeongin Ryu),최교남(Kyonam Choi),이용규(Yonggyu Lee),정동수(Dongsoo Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Due to wider operation engine speed range, from 3000 to 12,000 rpm, in small gasoline engine, EFI(Electronic fuel injection) with ECU and VVT (Variable Valve Timing) systems are necessary in order to increase engine performance. In Korea, both system are already adopted in automotive engines but are not in the engine for motorcycle. In this study, to check the applicability of VVT, various cams with different valve timings are tested in small single cylinder gasoline engines with EFI system. In oder to optimize valve timing with engine speed, intake valve opening timing is changed by every 5 CA deg with commercial cam. Compared to conventional valve timing in 4 valve SOHC single cylinder engine, 12% increase of engine power was obtained at low engine speed with 15° advanced IVO(intake valve opening) and 7% increase at high engine speed with 5° retarded IVO.
초음파 개질 경유의 연료특성과 연소특성의 상관관계에 관한 연구 (1) - 화학구조와 발열량과의 상관성
이병오(Byoungoh Lee),류정인(Jeongin Ryu) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.6
The main objective of this study is to investigate the relationship between chemical structure and higher heating value of reformed diesel fuels by ultrasonic irradiation. In order to analyze the chemical structure changes of the reformed diesel fuels by ultrasonic irradiation, Proton nuclear magnetic resonance spectrometer( 1 H-NMR) was used and to analyze the effect of higher heating values of these diesel fuels, the<br/> bomb calorimeter was used.<br/> From the study, following conclusive remarks can be made.<br/> 1) The aromatic carbon percentages and higher heating values of the reformed diesel fuels by ultrasonic<br/> irradiation increased more than the conventional diesel ones.<br/> 2) The aromatics percentages and Branch Index(BI) of the reformed diesel fuels by ultrasonic irradiation<br/> decreased more than the conventional diesel ones.<br/> 3) The higher heating values on both for conventional fuel and reformed diesel fuels by ultrasonic energy irradiation is directly proportional to aromatic carbon percentages and inversely proportional to aromatic percentages and BI for these fuels.<br/>
김용국(Yongguk Kim),류정인(Jeongin Ryu) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.4
The objective of this experimental study is to verify atomization characteristics of emulsified fuel. The emulsified fuel made of adding the ultrasonic energy is analyzed with atomization characteristics and chemicophysics. As water contents within emulsified fuel and needle angle increase, SMD, viscosity and surface tension were analyzed. By measuring the distribution percentage of hydrogen volume by ¹H-NMR spectrum, the proportion of aromatics and paraffins is analyzed and compared each other. The results of study is as follows. First, as water contents within emulsified fuel and needle angle of nozzle increases, SMD increases. Second, for the distribution percentage of hydrogen volume, the distribution percentage of aromatics is about 10% and the rest portion is paraffins.
이승진(Seungjin Lee),류정인(Jeongin Ryu),최수진(Sujin Choi),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As an engine has a wide range of rpm and loud, variable control system is necessary in order to increase engine performance. SCV has been frequently referred to as a possible way to increase engine performance at low rpm. The purpose of this study is.<br/> to investigate the influence of SCV, specially at the range of lower rpm, in a high-speed small engine. Experiments were conducted on 4Valves SOHC/air-cooling single cylinder engine and various SCV shapes have been tested and investigated for the performance of power, fuel consumption and emission.
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),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°.