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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.
위신환(Shin Whan Wei),김윤영(Yun Young Kim),김홍준(Hong Jun Kim),이종태(Jong Tai Lee) 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.2
To measure of thermal loading in the combustion chamber of hydrogen engine with dual injection, instantaneous wall-surface temperature and unsteady heat flux of the cylinder head are measured and analyzed. The maximum wall surface temperature is shown in direct injection region which has large heat supplied. Partial and spatial temperatures have slight deviation in transient region of injection, though injection method change suddenly. All of thermal characteristics such as instantaneous temperature, temperature swing and heat flux of hydrogen engine with dual injection are remarkably higher than those of gasoline engine. It means necessity of additional countermeasure of thermal loading.
DOHC 가솔린기관의 연소실 벽표면 순간온도와 비정상 열유속의 측정 및 해석 (제2보 : 피스톤에 관한 연구)
류영(Young Ryu),위신환(Shin Whan Wei),이종태(Jong Tai Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2
The instantaneous surface temperature and unsteady heat flux of the piston crown, ring groove and land are measured and analyzed. It was found that (ⅰ) the instantaneous surface temperature of the valve pocket, in the piston crown, is higher than that of the center of the crown and the instantaneous surface temperature at the edge of the crown is lowest; (ⅱ) the instantaneous surface temperature at the top-ring groove and land varied similarly to that of the piston crown, which are influenced by the behaivor of the piston ring; (ⅲ) the distributions of the heat flux are not coincided with the wall surface temperature, which are depended on the flame distance, combustion condition, behavior of the piston ring and the state of cooling, etc.<br/>