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류호성(Ho-Sung Ryu),송규근(Kyu-Keun Song) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A diesel engine is one of the major prime movers owing to its high chermal efficiency. But due to the recent attention for the environmental pollution. the emissions of diesel became a important problem. So it is needed to understand the characteristics of diesel spray injected into a combustion chamber. Because the diesel combustion is strongly controlled by a fuel injected into a combustion chamber.<br/> In this paper experiments were conducted for the variations of injection pressure (6. 10. 14 MPa). Velocity of motor (500. 750)<br/> 1000rpm) and impinging angle (0 30 45 ) to investigate the characteristics of diesel fuel impinging spray. And the notions impinging width. impinging thickness of the diesel spray are introduced to discuss the structure of the impinging spray
심상철,정병국,안병규,김장헌,정재연,송규근,Sim Song-Cheol,Jung Byung-Kook,Ahn Byoung-Kyu,Kim Jang-Hein,Jung Jae-Yeon,Song Kyu-Keun 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.1
The characteristics of diesel spray have effect on the engine Performance such as power. fuel consumption and emissions. Therefore, This study was Performed to investigate the effect of various injection parameters. In this study. the experiment is performed by using the high temperature and high pressure chamber. Spray behaviors are visualized by using the high speed camera and spray angle. Penetration etc. are measured. Experimental results are summarized as follows ; 1) Correlations of spray Penetration is expressed as follows $$0<t<t_b\;;\;S_1=11.628{\bigtriangleup}P^{-0.485}\;{\rho}_a^{-0478}t^{1.337}$$ $$t_b<t\;;\;S_2=7.457{\bigtriangleup}P^{-0.523}\;\rho_a^{-0.382}t^{0.548}$$ 2) Correlations of spray Angle is expressed as follows $$T_a=293K \;;\; tan({\theta}/2)=0.59({\rho}_a/{\rho}_f)^{0.437}$$ $$T_a=473K\;;\; tan({\theta}/2)=0.588({\rho}_a/{\rho}_f)^{0.404}$$ 3) The measured macro characteristics - spray tip penetration and spray angle agreed well with established correlations.
김형곤(Hyung-Gon Kim),야노토시아끼(Toshiaki Yano),송규근(Kyu-Keun Song) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The atomization characteristics were investigated through the influence of the change of GLR and the<br/> change of working fluid on droplet size distribution and mean diameter of drop produced by effervescent<br/> atomizer. For simultaneous injection of water and high viscous waste vegetable oil, effervescent atomizer with<br/> two aerator tubes was specially designed. From the experimental results, regardless of mass fraction of<br/> vegetable oil in working fluids, it is expected that effervescent atomizer will exhibit excellent atomization<br/> performance at the high GLR conditions.
2개의 기체주입관을 갖는 기체주입미립화기의 미립화 특성
김형곤(Hyung Gon Kim),김석곤(Seok Gon Kim),김재덕(Jae Duk Kim),송규근(Kyu Keun Song),김만영(Man Youmg Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
An experimental study was performed to investigate the atomization characteristics spray produced by effervescent atomizer. The atomization characteristics were examined through the changes of GLR and mixing rate of working fluids. Water and vegetable oil are sprayed as working fluids. For the simultaneous injection of different viscous working fluids, two-aerator tubes were designed inside the effervescent atomizer. LDPA was used to evaluate the atomization characteristics. Experimental results showed that the effervescent atomizer with two-aerator tubes will be capable of implementing several application requirements without any negative effect on atomization characteristics.
정재연(Jae-Youn Jung),백일현(Il-Hyun Baek),조인성(Ihn-Sung Cho),송규근(Kyu-Keun Song),오석형(Seok-Hyung Oh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
Recently, restrictions of performance, environment and noise on the oil hydraulic system of the heavy construction equipment have been reinforced continuously, so in order to solve these problems, studies on compactness of the system, operation under high rotating speeds and pressure, electronic control, substitute oil, and noise reduction have progressed briskly. In these recent studies, the operation of the system under high pressure has been studied continuously; however, the realization of it is very difficult due to mechanical limitations. For the operation of the hydraulic pump under high pressure, design techniques, manufacturing techniques, and improvement of lubrication performance of the working oi I are required. In this study, in order to respond to this demand for high pressure, the stress distribution and optimum design factors under the Max pressure were discussed through stress analysis of the cylinder block of the hydraulic axial piston pump, which is one of the most important relative sliding regions.
심상철(Sang-cherl Sim),조태영(Tae-young Cho),정병국(Byong-koog Jung),송규근(Kyu-keun Song),정재연(Jea-youn Jung),김형곤(Hyung-gon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Harmful elements from the exhaust gases are caused by incomplete combustion of mixture inside the engine cylinder and this abnormal combustion like misfire or partial burning is the direct cause of the air pollution and engine performance degradation. In this study, I obtain the shapes of spark, voltage and current generated when changing the experimental parameters such as grounded electrode shapes, electrode gap and the material of center electrodes. After that, I produce ignition energy by using the voltage and current and classify ignition energy into capacitive discharge energy and inductive discharge energy.