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CO₂ 냉매와 윤활유 환경하에서 코팅된 베인의 마찰 및 마멸특성에 관한 실험적 연구
오세두(Se-Doo Oh),정성훈(Sung-Hoon Jeong),안태식(Tae-Shik Ahn),박정민(Jung-Min Park),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
The CO₂ was investigated as an alternative refrigerant to replace HFC (hydrofluorocarbons) refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO₂ are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, wear volumes of vane surfaces applied various coatings were compared. Test results showed that WC/C and CrN coatings showed good tribological properties. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO₂ environment.
커먼레일 DME 연료시스템을 적용한 상용 DME 엔진 개발
오세두(Se-Doo Oh),박정권(Jung-Kwon Park),이호길(Ho-Kil Lee),이기수(Gee-Soo Lee),정수진(Soo-Jin Jeong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Di-methyl ether (DME) has attracted a iot of interest as the upcoming alternative fuel that can satisfy the saving of fossil energy and the reduction of air pollutants and the greenhouse gas such as CO₂. DME as an automotive fuel can be produced on similar levels of diesel oil prices. And it is reported that the DME engine shows the equal emission performance with a gasoline engine and the equal thermal efficiency with a diesel engine. In this study, the DME prototype engine was made with 3-liter diesel engine of a common-rail injection system. This engine has the high pressure fuel pump and the injectors for the DME fuel. The power performances and the emission characteristics of its engine were investigated with an universal ECU system. The high pressure pump is an eccentric type with 2-plungers, and the high pressure injector is designed by the nozzle flow analysis. The universal ECU system includes the separate injector driver. And injection rate, injection pressure, injection timing, injection duration, multi injection and EGR rate can be controlled by this system. The performance of an universal ECU system was confirmed comparing with that of the base diesel engine. DME engine performance was measured. And the emission characteristics of its engine were evaluated and in various operating conditions.
가솔린 직접분사 엔진 배기시스템의 온도균일도 특성에 관한 연구
오세두(Se-Doo Oh),박광진(Kwang-Jin Park),김현준(Hyun-Jun Kim),이호길(Ho-Kil Lee),정수진(Soo-Jin Jeong),박종일(Jong-Il Park),한승국(Seung-Kook Han) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The development targets of the gasoline engine should achieve the emission performance to comply with the LEV2-ULEV and EU Euro-5 emission requirements, and this engine have to meet SULEV and Euro-6 regulation in the near future. Because the majority of all harmful exhaust gases are emitted during the starting of the exhaust emission test, the fast light-off technology of catalyst is the key to meeting future stringent emissions regulations. In this study, temperature uniformity characteristics of exhaust gas were investigated in test modes of FTP-75 and NEDC, mounting thermocouples on exhaust system of the gasoline direct injection vehicle. The temperature distribution in catalyst cone and emission characteristics were evaluated in respect to test time each mode. And, the uniformity index for exhaust gad temperature were analyzed.
오세두(Se-Doo Oh),안종찬(Jong-Chan Ahn),박순철(Soon-Cheol Park),정원욱(Won-Wook Jung),배동호(Dong-ho Bae),이영제(Young-Ze Lee) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
In the present study, the residual stresses can have a significant on the life of structural engineering components. Residual stresses are created by the surface treatment such as shot peening or deep rolling. The objective of this experimental investigation is to study the influence of friction and wear characteristics due to residual stress under dry sliding condition. Friction and wear data were obtained with a specially designed tribometer. Test specimens were made of SUP9(leaf spring material) after they were created residual stress by shot peening treatment. Residual stress profiles were measured at surface by means of the X-ray diffraction. Sliding tests were carried out different contact pressure and same sliding velocity 0.035m/s(50rpm). Leaf spring assembly test used to strain gauge sticked on leaf spring specimen in order to measure interleaf friction of leaf spring. Therefore, we were obtained hysteresis curve. As the residual stresses of surfaces increased, coefficient of friction and wear volume are decreased, but the residual stresses of surfaces are high, and consequently wear volume do not decreased. Coefficient of friction obtained from leaf spring assembly test is lower than that obtained from sliding test. From the results, structural engineering components reduce coefficient of friction and resistant wear in order to have residual stresses themselves. Leaf spring;Shot peening;Residual stress;Interleaf friction force