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- 저자 : 김창업 ( Chang Up Kim ) (검색결과 21 건)
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LPG액상분사식(LPLi) 엔진에서 연료와 연료공급계통 고무류 부품사이의 반응성 연구
김창업(Chang Up Kim),박철웅(Cheol Woong Park),강건용(Kern Yong Kang) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.4
The liquid phase LPG injection (LPLi) system (the 3rd generation technology) has been considered as one of the most promising fuel supply systems for LPG vehicles. To investigate the reaction characteristics of LPG with rubber parts in LPLi system, various rubbers were tested. The results showed that the amount of residue from the cover rubber of a fuel pump was increased about 10 times after testing. Furthermore, the amount of sulfur and nitrogen species which are considered as main sources of deposit formation in LPLi fuel injectors were also found to be higher than those in original LPG fuel. In addition, these residues made the core parts of LPLi injector such as needle and nozzle, partially worn, which eventually causes leakage in LPLi injectors.
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김창업 ( Chang Up Kim ),최교남 ( Kyo Nam Choi ),강건용 ( Kern Yong Kang ),박철웅 ( Cheol Woong Park ) 한국분무공학회 2011 한국분무공학회지 Vol.16 No.1
In recent years, the need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as LPG (Liquefied Petroleum Gas) which is able to meet the limits of better emission levels without many modifications to current engine design. LPG has a high vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels. These different fuel characteristics make it difficult to directly apply the conventional gasoline or diesel fuel pump. Self acting lubricated groove design or coating can be used in high-speed and high precision spindle system like a roller-vane type fuel pump, because of its advantages such as low frictional loss, low heat generation, averaging effect leading better running accuracy and simplicity in manufacturing. Those design method can also affect the atomization of fuel from the injector and the formation of fuel film on the intake manifold. In this study, experiments are carried out to get performance characteristics of initial and steady state operation. The characteristics of vane type fuel pump were investigated to access the applicability on LPLi engine.
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LPG 액상분사식 인젝터에서 후적에 의한 아이싱 특성 연구
박철웅,김창업,최교남,강건용,Park, Cheol-Woong,Kim, Chang-Up,Choi, Kyo-Nam,Kang, Kern-Yong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Since the liquid phase LPG injection(LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a dropping of LPG fuel but also icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of HC emissions. The experimental investigation was carried out on the bench test rig in this study. It was found that n-butane, that has a relatively high boiling point($-0.5^{\circ}C$), was a main species of droplet composition and also found that the droplet problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the an engine head temperature was increased, although a large amount of icing deposit was still observed in the case of $87^{\circ}C$. Also, it was observed that the icing phenomenon is improved by using anti-icing bushing.
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기지내 반응법에 의한 WC 복합재료의 제조에 관한 연구 (1) - 주조접합된 주철 / 텅스텐 와이어의 계면반응층 생성기구와 조직특성 -
박흥일,김창업,허보영,이성렬,김창규 ( Heung Il Park,Chang Up Kim,Bo Young Huh,Sung Youl Lee,Chang Gyu Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.3
Iron-based metal matrix composites have been recently investigated for the use of inexpensive abrasion resistance material. This paper carried out to investigate the in-situ reaction effects on the microstructural characteristics and the formation mechanism of tungsten carbides in a white cast iron matrix. The specimens of Fe-3.2%C-2.8%Si alloy cast-bonded with tungsten wire were cast in the metal mold and isothermally heat treated at 950℃ up to 48 hours. The typical microstructure of heat treated specimens showed the reaction layer of WC at the interface of tungsten wire and the carbon depletion zone between the WC layer and the matrix. During the formation of WC layer, if the carbon supply is insufficient due to the decarburization of matrix or the isolation of matrix by cast-bonded W wires, the reaction layer develops coarse hexagonal crystalline WC. From the microstructural investigation, it was found that the volume of WC layer and the carbon depletion zone increased linearly with the isothermal heat treating time. This results supported that the formation rate of WC in the white cast iron matrix is controlled by the interfacial reaction with a constant reaction rate.
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분사주조공정에 의하여 제조된 Al-Pb 과편정합금의 조직특성
배차헌,정해용,박흥일,김창업,이성렬 ( Cha Hurn Bae,Hae Young Jeong,Heung Il Park,Chang Up Kim,Sung Ryeol Lee ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.4
In Al-Pb monotectic alloys Pb particles are difficult to uniformly distribute over the Al matrix because of the gravity segregation of pb element. Therefore the effects of centrifugally spray casting process on microstructures and distributions of Pb particle were investigated. As the preform thickened the sine of Pb particle became larger, the amount of porosity became lower and microstructures showed the change from spray-deposition microstructures in the lower part of the preform to spray-casting microstructures in the upper part of it. The size of Pb particles, amount of porosity and splat layer boundaries in hot forged preform showed still less than of as-deposited preform
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