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박정서(Jungseo Park),염기태(Kitae Yeom),장진영(Jinyoung Jang),문석수(Seoksu Moon),배충식(Choongsik Bae),박정남(Jeongnam Park),김성근(Sungkun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A de-icing method was investigated using by heater coil wire attached conventional 4-hole Top-feed type injector for LPG(liquefied petroleum gas) liquid injection. The heat loss on the nozzle tip of injector was evaluated by measuring the input power to the heater coil wire to keep the initial temperature of nozzle tip surface. Test was conducted for various conditions of injection duration, injection interval and fuel pressure. Unexpectedly, in according to the increase of injection rate, the heat loss of nozzle tip was decreased. Considering the total heat energy balance on nozzle tip can describe these phenomena. The heat loss of nozzle tip was increased as the injection frequency is increased, while slightly smaller heat loss is observed at higher injection pressure. These results could give the basic information about the required heat energy to maintain the nozzle tip temperature as initial condition.
Top-Feed Type 인젝터의 LPG 액상분사 적용성
염기태(Kitae Yeom),박정서(Jungseo Park),장진영(Jinyoung Jang),문석수(Seoksu Moon),배충식(Choongsik Bae),박정남(Jeongnam Park),김성근(Sungkun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The injection and spray characteristics of Top-feed type injector was investigated under liquid phase injection fueled with liquefied petroleum gas (LPG). Different pressures and temperatures of fuel injection system were tested to identify the injection characteristics after hot soaking. MIE-scattering technique was used for verification of successful liquid phase injection after hot soaking. In case of Bottom-feed type injector, the injection was accomplished at every experimental condition. In case of Top-feed type injector, when the pressure of LPG was over 12 bars, the injection was not executed. The effects of temperature of fuel on fuel injector were little. However, under the pressure were 12 bars, the liquid phase injection after hot soaking was accomplished.
Top-Feed Type 인젝터의 액상분사 LPG연료 분사장치 적용
염기태(Kitae Yeom),박정서(Jungseo Park),배충식(Choongsik Bae),박정남(Jeongnam Park),김성근(Sungkun Kim) 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.6
The injection and spray characteristics of top-feed type injector was investigated under liquid phase injection fueled with liquefied petroleum gas (LPG). Different pressures and temperatures of fuel injection system were tested to identify the injection characteristics after hot soaking. MIE-scattering technique was used for verification of successful liquid phase injection after hot soaking. In case of bottom-feed type injector, the injection was accomplished at every experimental condition. In case of top-feed type injector, when the pressure of LPG was over 1.2 ㎫, the injection was not executed. However, under the pressure were 1.2 ㎫, the liquid phase injection after hot soaking was accomplished. The engine with top-feed type fuel injection equipment was restarted successfully after hot soaking.
가스 분사 시스템에서 연료 레일의 압력 변동에 대한 실험적 연구
장열성(Yeolsung Jang),우성동(Sungdong Woo),엄인용(Inyong Ohm),김성근(Seongkeun Kim),박정남(Jeongnam Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The basic phenomena in fuel rail of LPG gaseous injection system is studied through measuring the flow rate of injector and the rail pressure fluctuation. Four injection systems, three are commercial ones and another is newly manufactured one which has reverse "L" type section for preventing undesirable liquid phase injection, were compared with varying number of working injector and engine speed. The results show that flow rate of injector is linearly proportional to injection duration and rail pressure and the pressure fluctuation of rail is up to O.25bar when supply pressure is 1.5bar. Also the results show that the fluctuation decreases as the engine speed increases and crank angle based frequency of the fluctuation is dominated not by number of injector but by engine speed i e injection frequency. Lastly, an increase of the rail volume is very effective for reducing the fluctuation.
朴吉鉉,朴正南 조선대학교 국토개발연구소 1980 국토개발연구 Vol.2 No.1
This paper is a study on the design of reinforced concrete that was subjected to torsion. In this paper, the data on the design of concrete members subjected to torsion and bending, torsion and shearing, and combined stress by shearing, which have been studied up to now was checked. And what is thought to be the most adquate of the data was developed and arranged. Finally, an example is given to explain how this can put to practical use.