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오민석(M. S. Oh),양경욱(K. U. Yang) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
In the case of ships, fuel consumption varies depending on external load power such as a viscous resistance, a wave resistance, and an air resistance. Therefore, it is a parameter that must be considered when calculating fuel consumption as the ship is under sailing. The external load force is determined by the length, width, depth, draft, and deadweight of the ship and the speed of the ship. Since this major parameter affects the magnitude of the external resistance applied to the ship, it is calculated in consideration of the external load power and the speed of the ship in order to calculate the power of the engine used in the ship. In this study, the engine power required for the maximum speed roll operation of the ship was calculated and the engine fuel consumption was calculated considering the load rate (speed) of the ship.
SI 희박연소 엔진의 연소특성에 미치는 EGR의 영향에 관한 실험적 연구
김치원(C. KIM),서병준(B. SEO),채태희(T. CHAE),오민석(M. OH),김대훈(D. KIM),이종진(J. LEE),이병호(B. LEE) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
As an intake process in the conventional spark ignition gasoline engine, the mixture with gasoline and air are inlet through the suction valve into cylinder, compressed and then ignited by an electric discharge, therefore the state of mixture is very important in the characteristics of combustion and emission. Therefore the lean operation is known to decrease the exhaust emission while maintaining a good fuel economy, but at very lean mixtures, the combustion rate has been resulted to reduce. In this experimental study, it is experimented and analyzed the combustion and emission formation according to intake some charge conditions in the lean bum and normal gasoline engine, which is modified the intake system with engine speed, EGR rates and gas temperatures. The following conclusions were drawn out by using the analysis of combustion and emission in this engine with engine speed, flow rates and temperatures of EGR. It is found that the maximum combustion pressure has risen in the condition of lower temperature more than higher temperature of the inflow exhaust gas. And the occurance crank angle of peak pressure has been advanced to the TDC. The brake specific fuel consumption in the cooled EGR gas has enhanced by 7 g/ps-h than that in the hot exhaust recirculation gas of engine charge. It has been verified that NO formation has been reduced as the flow rate of the cooled exhaust recirculation gas, but not reduced clearly the temperature of the hot EGR gas. The formation of unburned hydrocarbon has been reduced more in the case of 10% rate of EGR gas, and then found this phenomenon at lean mixture operation of this gasoline engine.