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오은탁(Euntak Oh),류호성(Hosung Ryu),송규근(Kyukeun Song),정재연(Jaeyoun Jung) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Diesel engine, which has high thermal efficiency, is one of the major movers. Recently, as people pay attention to the environmental pollution, thc emission of Diesel engine becomes an important problem. So it is needed to understand the characteristics of diesel fuel spray injected into a combustion chamber to reduce the emission.<br/> The factor, which controls the diesel spray, is the injection pressure, engine speed and, ambient pressure. In this paper, experiments were conducted free spray for the ambient pressure (30, 40, 50MPa), the Injection Pump speed(500, 700, 900rpm) and Nozzle Injection Pressure(10, 14, 18MPa). With the higher opening pressure, the spray tip velocity and spray penetration increases while the spray angle decreases. On the other hand. as the engine speed increases. the spray angle and spray tip velocity increases while the spray tip penetration decreases. also, while the higher ambient pressure. the spray angle increases while the spray tip penetration and spray tip velocity decreases.<br/> <br/>
고온.고압용기 내에서 핀틀노즐의 분무특성에 관한 실험적 연구
송규근,정재연,정병국,안병규,오은탁 한국마린엔지니어링학회 2003 한국마린엔지니어링학회지 Vol.27 No.1
The characteristics of fuel spray have an important effect on engine performance such as power, specific fuel consumption and emission because fuel spray controls the mixing and combustion process in an engine. Therefore, if the characteristics of fuel spray can be measured, they can be effectively used for improving engine performance. The major factors controlling fuel spray are injection pressure, ambient pressure and engine speed. In this study, the experiment is performed in a high temperature and high pressure chamber. In experiments, spray tip penetration, spray angle and spray tip velocity are measured at various injection pressure (10 and 14 MPa), ambient pressure(3,4 and 5 MPa), fuel pump speed(500, 700 and 900 rpm). Experimental results are useful for deriving an experimental spray equation and design an optimal engine. The results showed that injection pressure, ambient pressure and fuel pump speed are important factors influencing on the characteristics of spray. 1) Injection pressure influences on the characteristics of spray. That is, as injection pressure is increased, spray angle is decreased but spray penetration and spray tip velocity is increased. 2) Spray angle and spray penetration are increased as fuel pump speed is increased.
안병규(Byoungkyu Ahn),류호성(Hosung Ryu),오은탁(Euntak Oh),송규근(Kyukeun Song),정재연(Jaeyoun Jung) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Ambient gas density and Temperature effect on the width and height of Impingement spray were examined. The gas chamber density was varied 18kg/㎥ to 30kg/㎥, temperature was varied 293K to 473K. These ranges included gas density are top-dead-center conditions in current technology light-duty diesel engines. The Spray images were used to measure the impingement spray characteristics by the spray shape as the function of time and space. A mechanically actuated KP-PE type injection system was used to supply the fuel into a pressurized and heated spray chamber.<br/> With the higher density and temperature, the Impingement spray characteristic is decreased. On the other hand, The effect of temperature hardly be found in the highest density<br/> <br/>