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LPG 액상 분사 시 인젝터 주위의 Icing 현상에 관한 연구(II)
박정철(Jungcheol Park),김우석(Wooseok Kim),박심수(Simsoo Park),박영무(Youngmoo Park),유재석(Jaisuk Yoo),이종화(Jonghwa Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Recently, LPLi(Liquied-Phase LPG injection) system is studied for the new stringent emission regulations. But,<br/> there are some problems to be solved such as injector tip icing and fuel leakage for LPLi system development.<br/> Icing is closely related to the temperature of the intake port wall surrounding the injector and the variation of the<br/> LPG fuel pressure. Also, the shape of the injector tip, injector installed position and the number of injector holes are<br/> factors for icing. In this study, the icing characteristic of the LPLi injection system was investigated with<br/> visualization test rig, which was installed thermocouples, fuel compressor equipments, and injector controller.<br/> The icing of the injector tip can be affected by the materials related to heat transfer. The variation of temperature<br/> surrounding injector tip was observed with injector position, fuel pressure, and the number of injector holes.
HFC-152a + Propane 혼합냉매의 기-액 평형에 관한 실험적 연구
이광재(Kwangjae Lee),강준원(Junone Kang),박영무(Youngmoo Park),유재석(Jaisuk Yoo),김현정(Hyunjung Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The equilibrium data of binary systems 1,1-Difluoroethane (R-152a) + Propane (R-290) were measured. Forty equilibrium data for 1,1-Difluoroethane (R-152a) + Propane (R-290) system were measured over the temperature range 273.15~313.15 K at 10 K interval and the composition range 0.2~0.8, respectively. Vapor-liquid equilibrium data were calculated by using equation of state and compared with present data. CSD, PR, RKS equation were used as equation of state. Positive azeotropic mixture are found around a composition x₁=0.73.
가솔린 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구
유정철(Jengcheol Yoo),송해박(Haibak Song),박경석(Kyungseok Park),유재석(Jaisuk Yoo),박영무(Youngmoo Park),이종화(Jonghwa Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
A vehicle fuel economy is one of the most important issues in view of environmental regulation and customer’s<br/> needs. In order to improve the vehicle fuel economy, great efforts has been carried out on the components bases .<br/> However, systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel<br/> economy. In this paper, a methodology for the breakdown of vehicle fuel consumption was studied and proposed for<br/> systematic analysis of the vehicle fuel economy. The energy equation for the vehicle power train was set up for the<br/> analysis of the vehicle fuel economy and simplified to be calculated or estimated using the measured data in a<br/> vehicle. The amount of fuel that was used in vehicle components under arbitrary driving conditions was quantified.