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이종태(Jong Tai Lee),백성호(Sung Ho Paik) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.1
As an essential step for development of a duel injection hydrogen fueled engine which can obtain high thermal efficiency and power in overall operating range, performance and BFL(back fire limit) equivalance ratio in hydrogen fueled engine with external mixture are investigated. As .the results, BFL equivalence ratio in hydrogen fueled engine with external mixture is approximately 0.7. It is deduced that controls of driving conditions are required in transient stage from external mixture type to inner injection type. And in order to increase thermal efficiency, it is also found that BFL equivalence ratio should be expanded as much as possible.
이종태(Jong-Tai Lee),이성열(Seong-Yol Lee) 한국자동차공학회 1983 오토저널 Vol.5 No.1
There exist many kinds of frictions in internal combustion engine such as piston ring and skirt, cam and tappet, bearing friction etc. Among them, the frictions between piston ring, skirt and cylinder are particular.<br/> These frictions for motoring test are differ from that of firing test even though the temperature of cooling water and lubricating oil keep identically. The frictions for firing test are increased due to combustion pressure and products.<br/> The precise calculation of the friction is difficult. But we can assume that the friction is governed by the viscosity of lubricating oil and gas pressure of cylinder. And the viscosity of lubricating oil is dependant on gas temperature of cylinder, so the piston friction may be governed by gas pressure and temperature of cylinder.<br/> In this treatise, we propose the method of evaluating piston friction under the condition of constant engine speed, and we analyzed the behaviours and influence of factors concerned with the piston friction for output correction when the inlet pressure and temperature were varied.<br/> The main results are as follows:<br/> 1) The behaviours on the inlet conditions for the contact force of the piston rings and the viscosity of the lubricating oil concerned with piston friction are found.<br/> 2) The essential point the these behaviours is dependant on the cyclic variation following to the inlet conditions.<br/> 3) According to our analysis, It was observed that the viscosity of lubricating oil is more effective than the contact force to the piston rings.
[論文] 선회류가 있는 연소실의 연소에 미치는 점화위치의 영향
이종태(Jong Tai Lee) 한국자동차공학회 1988 오토저널 Vol.10 No.5
The effects of ignition position on combustion in a chamber with swirl flow were investigated by use of hot wire anemometer, high speed schlieren photography, and chamber pressure measurement.<br/> In experiments, the closed-constant volume combustion chamber was used, and the swirl was formed unsteadily by suction of external fluid after reducing pressure in the chamber.<br/> Results show that the effect of ignition position on combustion depends on the flow state and the flame propagation distance corresponding to each ignition position. Also, the effect of combustion promoting increases as an ignition position moves from the center of chamber to the outside, but maximum burning pressure was obtained at the position that is the shortest flame propagation distance.
AlxGa₁-xAs / AlAs / GaAs계로 이루어진 비대칭 이중 양자우물 구조에서의 광 Luminescence 특성 연구
정태형(Taehyoung Zyung),강태종(Tai-Jong Kang),이종태(Seon-Kyu Han),한선규(Jong-Tai Lee),유병수(Byueng-Su Yoo),이해권(Hae-Kwon Lee),이정희(Jung-Hee Lee),이민영(Min-Yung Lee),김동호(Dong-Ho Kim),임영안(Young-Ahn Leem),우종천(Jong-Chun 한국광학회 1992 한국광학회지 Vol.3 No.3
AlxGa_(1-x)As/AlAs/GaAs계로 이루어진 비대칭 이중 양자우물 구조의 광학적 특성을 photoluminescence, photoluminescence excitation, time-resolved photoluminescence를 통하여 조사하였다. 양자장벽 AlAs의 두께에 따른 특성 변화를 조사하기 위하여 두께를 15Å, 150Å로 제작하였다. 양자장벽이 15Å인 경우 매우 빠른 전자의 관통 현상을 보여 주었으며, 이로 인해 AlxGa_(1-x)As의 여기자 재결합에 해당하는 피크가 관찰되지 않았다. AlAs 양자장벽이 150Å인 경우에는 AlxGa_(1-x)As 양자우물에서 여기자 재결합에 의한 피크가 50 ㎰ 이하로 빠른 decay 시간을 보여 주었으며 이것은 양자장벽과의 Γ-X전이에 의한 것으로 사료되었다. GaAs 양자우물에서의 luminescence decay는 두 시료 모두 1 ㎱정도 이었으나, 15Å인 경우에는 약 100 ㎰의 rise 시간이 존재하였으며 이것은 정공의 관통에 의한 시간으로 판명되었다. Luminescence properties of asymmetric double quantum well structure composed of AlxGa_(1-x)As/AlAs/GaAs have been studied by steady state and time-resolved photoluminescence and phtoluminescence excitation spectroscopy at low temperature. Two quantum well samples with different barrier thickness (15Å and 15Å) were prepared to investigate the dependence of tunneling characteristics on barrier thickness. The abscence of excitonic recombination peak from AlxGa_(1-x)As wen for the 15Å barrier sample indicates a very fast electron tunneling to GaAs well. Meanwhile, Γ-X transition between wen and barrier is supposed to be a major route for the fast decay of luminescence from AlxGa_(1-x)As wen in the 150Å barrier sample. Time-resolved photoluminescence from GaAs wen of 15Å sample shows the exsitence of the rise with 100 ps which is attributed to the hole tunneling.
스월유동장에 있어서 연소속도에 미치는 난류특성의 영향에 관한 연구
이상준,이종태,이성열,Lee, Sang Jun,Lee, Jong-Tai,Lee, Song-Yol 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.1
Flow velocity was measured by, use of hot wire anemometer. Turbulence intensity was in proportion to mean flow velocity regardless of swirl velocity. And integral length scale has proportional relation with swirl velocity regardless of measurement position. Turbulent burning speed during flame propagation which was determined by flame photograph and gas pressure of combustion chamber was increased with the lapse of time from spark and was decreased a little at later combustion period. Because of combustion promotion effect, turbulent burning speed was increased according to increase of turbulence intensity. Burning speed ratio i.e. ratio of turbulent burning speed ($S_BT$) to laminar burning speed ($S_BL$) was found out by use of turbulence intensity u' and integral length scale $l_x$ , $\delta_L$ is width of preheat zone in laminar flame.
정대용,이종태,Jeong, Dae-Yong,Lee, Jong-Tai 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
Combustion characteristics on diesel-water emulsion are analyzed in high pressure injection for several variables such as water content, injection pressure and injection timing. As a fact of well-known, maximum combustion pressure was decreased and ignition delay was elongated in accordance with increasing of water content. But these characteristics were enhanced with increase of injection pressure to high pressure. It was shown that combustion of neat diesel in case of injecting with 600bar is similar to that of 20 % diesel-water emulsion was injected at 1200 bar.
연료 고압화에 의한 LPDi 기관의 인젝터 내 기포발생 억제에 관한 기초 연구
노기철,이종태,Noh, Ki-Chol,Lee, Jong-Tai 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
To suppress the bubble generated in the liquid LPG direct injector is the most important to develop the LPDi engine. It was found in the previous study that bubbling phenomenon in the injector of the LPDi engine is decisively influenced by pressure of fuel and temperature around the injector. Therefore, in this study, the effect on suppressing the bubbling in the LPDi injector by high pressurization of fuel is analyzed and the spray characteristics are also studied. As a result, it is found that the bubbling in the LPDi injector is radically suppressed when the pressure of fuel is over 50MPa. The bubbling is suppressed when the pressure of fuel is over 3MPa if the inserted position of the injector is considered. Also, it is confirmed that the higher the pressure of fuel is the longer spray tip penetration and is the larger spray angle. As the ambient pressure increases, spray tip penetration decreases and spray angle increases due to the increase of drag force.
이중분사식 수소기관 연소실내 가스의 순간열전달계수의 측정
위신환,김윤영,이종태,Wei, Shin-Whan,Kim, Yun-Young,Lee, Jong-Tai 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.4
To clear the differences of heat transfer coefficient of in-cylinder gas with fuel properties, the transient heat transfer coefficient of hydrogen gas is investigated by using the hydrogen fueled engine. The measured results were also compared with those of gasoline engine and several empirical equations. Transient heat transfer coefficients were determined by measurements of unsteady heat flux and instantaneous wall temperature in the cylinder head. As the main results, it is shown that transient heat transfer coefficients have remarkable differences according to fuel properties, and it's value for hydrogen engine is twice higher than that of gasoline engine. It means that equation of heat transfer coefficient that the effect of fuel properties is considered sufficiently, is needed to analyze or simulate the gas engine performance.