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송규근(Kyukeun Song),김상민(Sangmin Kim),정재연(Jaeyeon Jung),심상철(Sang cherl Sim),김형곤(Hyunggon Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
in this study. This experiments were performed the spray characteristics of diesel spray in common-rail system according to fuel temperature, injection pressure and spray time etc. Diesel have different spray patten due to injection pressure and spray time in common-rail system. A Filter pressure is influenced by fuel temperature which is turned to fuel viscosity related to a fluid flowing.
냉동 공조용 로터리 콤프레서의 베인과 롤링 피스톤간의 마찰 특성
조인성(IhnSung Cho),송규근(KyuKeun Song),정재연(Jae Youn Jung),오석형(SeokHyung Oh) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
The rolling piston type-rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of refrigerant compressors. The study of lubrication characteristics in the critical sliding component is essential for the design of refrigerant compressors. Therefore, experimental investigation of the lubrication characteristics of a rotary compressor used for refrigeration and air-conditioning systems was studied. In order to measure the friction force between the vane and rolling piston, an experimental apparatus known as the Pin-on-Disk was used. Load is applied by the hydraulic servo valve controlling the pressure of the hydraulic cylinder. The results showed that the rotational speed of a shaft and the discharge pressure significantly influence the friction force between the vane and the rolling piston.
김상민(Sangmin Kim),송규근(Kyukeun Song),정재연(Jaeyeon Jung),심상철(Sangcherl Sim),김형곤(Hyunggon Kim) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
The using of diesel engine will be increased in the world for fuel economy. But diesel engine exhaust emission such as much NOx, smoke etc. In this study, Thís experiments were performed the spray characteristics of diesel spray in common-rail system according to fuel temperature, injection pressure, injector spray time and fuel viscosity etc. Diesel have different spray patten due to injection pressure and spray time in common-rail system. A Filter pressure is influenced by fuel temperature which is turned to fuel viscosity related to a fluid flowing. The effect of the bio-diesel fuel mixing ratio on the spray and atomization characteristics was also investigated at various experimental conditions. It shows that the droplet atomization characteristics of bio-diesel fuel show deteriorated results as the mixing ratio of biodiesel increased because of the high viscosity.
Common-Rail System하의 디젤 연료의 분무특성에 관한 실험적 연구
김상민(Sangmin Kim),송규근(Kyukeun Song),정재연(Jaeyeon Jung),심상철(Sangcherl Shim),김형곤(Hyunggon Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
in this study. This experiments were performed the spray characteristics of diesel spray in common-rail system according to fuel temperature, injection pressure and spray time etc. Diesel have different spray patten due to injection pressure and spray time in common-rail system. A Filter pressure is influenced by fuel temperature which is turned to fuel viscosity related to a fluid flowing.
김상민(Sangmin Kim),송규근(Kyukeun Song),정재연(Jaeyeon Jung),심상철(Sangcherl Sim),김형곤(Hyunggon Kim) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
The using of diesel engine will be increased in the world for fuel economy. But diesel engine exhaust emission such as much NOx, smoke etc. In this study. This experiments were performed the spray characteristics of diesel spray in common-rail system according to fuel temperature, injection pressure, injector spray time and fuel viscosity etc. Diesel have different spray patten due to injection pressure and spray time in common-rail system. A Filter pressure is influenced by fuel temperature which is turned to fuel viscosity related to a fluid flowing. The effect of the bio-diesel fuel mixing ratio on the spray and atomization characteristics was also investigated at various experimental conditions. It shows that the droplet atomization characteristics of bio-diesel fuel show deteriorated results as the mixing ratio of biodiesel increased because of the high viscosity.
김재덕(Jaeduk Kim),송규근(Kyukeun Song),정재연(JaeYoun Jung),진뢰(Lei Chen),성욱곤(Yukun Cheng) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
With the development of global automobile industry, the pollution caused by automobile exhaust gas has become more and more serious, especially NOx pollution. During these years, the government recognizes the problem and legislates to limit the exhaust emission. As the main power source of vehicle, the question how to purify NOx emission for diesel engine has become one of the hotspots. Now, technology of EGR is known as the effective method to purify NOx emission, which is available for diesel engine. diesel engine are introduced in this article. The mechanism of nitrogen oxides formation and how the EGR can reduce the NOx emission are studied, and we have done the test experiment of the diesel engine, The main contents includes: Adapting to the requirement of the emission legislation, an EGR system was applied to a diesel engine to reduce NOx emission. The effects of different EGR rate on the emissions and performances of the engine were investigated by the engine test, in which the EGR rates of different engine mode will be optimized based. The results showed that EGR can reduce NOx emission of this diesel engine significantly under various operation conditions, but it will have negative influence on smoke, the effective torque and the effective specific fuel consumption with the increasing of EGR rates. So there will be an optimum working state of EGR rates under various operation conditions. Through the optimum emission test for EGR, it proves that the optimized EGR strategy can reduce the NOx emission efficiently and limit the negative influence on other emission and the performance of engine.
김재덕(Jaeduk Kim),구리 아이눌(Ghurri Ainull),송규근(Kyukeun Song),정재연(Jaeyeon Jung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study is conducted to investigate the fuel spray characteristics on common-rail injection system according to fuel type, injection pressure, injection duration, and fuel viscosity respectively. The effect of the biodiesel fuel mixing ratio on the spray and emission gases characteristics are also informed at various experimental conditions. The experiment results show that the biodiesel characteristics in this study have different spray patterns compared to the diesel fuel due to injection pressure and injection duration. The emission characteristics of biodiesel fuel are affected by the mixing ratio of biodiesel. It has lower emissions compared to diesel fuel though it has similar power to diesel fuel.
안병규(Byoungkyu Ahn),조태영(Taeyoung Cho),송규근(Kyukeun Song),정재연(Jaeyoun Jung) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The Characteristics of diesel Spray have much effect on the engine performances such as power, fuel economy and emissions. Therefore, the measurement of fuel spray characteristics is very important for the improvement of heat engine.<br/> The factors which control diesel spray characteristics are injection pressure, ambient temperature and density on diesel sprays.<br/> We measured spray angle, spray penetration by using the images of high speed video camera. Experimental results are summarized as follows; <br/> 1) Ambient temperature and density influence on the characteristics of diesel spray.<br/> Namely, As ambient temperature and density are increased, spray penetration is decreased but spray angle is increased.<br/> 2) Experimental equation of spray penetration is expressed as follows<br/> 0< t< t??; S₁= 11. 628??P??ρ??t??<br/> t??<t; S₂=7.457??P??ρ??t??<br/> 3) Experimental equation of spray Angle is expressed as follows T??=293K; tan (θ/2)=0.59(ρ??/ρ??)??<br/> T??=473K; tan (θ/2) =0.588(ρ??/ρ??)??<br/> <br/>