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Chung, Han-Shik,Choi, Seuk-Cheun,Jong, Hyo-Min,Lee, Chi-Woo,Kim, Chi-Won The Korean Society of Marine Engineering 2004 한국마린엔지니어링학회지 Vol.28 No.1
In this research, a computer analysis has been developed for predicting the Pipe pressure of the intake and exhaust manifold in a small single cylinder engine. To get the boundary conditions for a numerical analysis one dimensional and unsteady gas dynamic calculation is performed by using the MOC(Method Of Characteristics). The main numerical parameters are engine revolutions. to calculate the Pulsating flow which the intake and exhaust valves are working. The distributions of the exhaust pipe pressures were influenced strongly to the cylinder pressures and the shapes of exhaust pressure variation were similar to the Inside of cylinder pressure As the engine revolutions are increased. the intake pressure was lower than ambient pressure. The amplitude of exhaust pressure had increased and the phase of cylinder pressure $P_c$ is delayed and the amplitude of cylinder pressure were increased.
Fluid Flow Characteristics in the Aquaculture Tank for a Breeding Fish
Hyo Min Jeong,Han Shik Chung,Se Hyun Kim,Seuk Cheun Choi,Kang Youl Bae 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.12
The aquaculture tank is used for breeding fish in sea water which was pumped up to land. The flow characteristics in the aquaculture were investigated with varying the tank geometry and flow rate. The numerical analysis has been employed for calculating the velocity and tempera-ture distributions in a water tank of rectangular type. The finite volume method and SIMPLE algorithm with 3-dimensional standard k-E turbulence model were used for the numerical analysis. For comparison with experimental results, the PIV system was applied to visualize the flow patterns quantitatively. The numerical results showed good agreements with the experimental results. The mean velocity and temperature versus aquarium depth were represented for various circulating flow rates. Especially, the aquaculture environment is recommended that the aquarium depth has to be d=0.5 m, and this case is the condition of higher velocity and temperature in winter season.<br/>
Fluid Flow Characteristics in the Aquaculture Tank for a Breeding Fish
Jeong, Hyo-Min,Chung, Han-Shik,Kim, Se-Hyun,Choi, Seuk-Cheun,Bae, Kang-Youl The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.12
The aquaculture tank is used for breeding fish in sea water which was pumped up to land. The flow characteristics in the aquaculture were investigated with varying the tank geometry and flow rate. The numerical analysis has been employed for calculating the velocity and temperature distributions in a water tank of rectangular type. The finite volume method and SIMPLE algorithm with 3-dimensional standard $\kappa$-$\varepsilon$ turbulence model were used for the numerical analysis. For comparison with experimental results, the PIV system was applied to visualize the flow patterns quantitatively. The numerical results showed good agreements with the experimental results. The mean velocity and temperature versus aquarium depth were represented for various circulating flow rates. Especially, the aquaculture environment is recommended that the aquarium depth has to be d=0.5 m, and this case is the condition of higher velocity and temperature in winter season.
이효덕(Hyo Deok Lee),최석천(Seuk Cheun Choi),이상철(Sang Chul Lee),이광영(Kwang Young Lee),정효민(Hyo Min Jeong),정한식(Han Shik Chung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this study, a experimental method has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths, to measuring the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compresson wave in exhaust pressure was increased. According to decreasing pipe diameter the number of compresson wave in exhaust pressure was increase, the second amplitude was incresed.
최석천(Seuk Cheun Choi),이해종(Hae Jeong Lee),신유식(You Sik Shin),정한식(Han Shik Chung),정효민(Hyo Min Jeong),이광영(Kwang Young Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, a experimental method has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths, to measuring the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compression wave in exhaust pressure was increased. According to decreasing pipe diameter, the number of compression wave in exhaust pressure was decreased. When the pipe diameter was increase, the second amplitude was increased.
4행정 단기통 가솔린 엔진의 배기관에 따른 압력 변동 특성
이효덕(Hyo Deok Lee),최석천(Seuk Cheun Choi),김세현(Se Hyun Kim),이철재(Cheol Jae Lee),정효민(Hyo Min Jeong),정한식(Han Shik Chung) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In this study, a experimental method has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths, to measuring the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compression wave in exhaust pressure was increased. According to decreasing pipe diameter, the number of compression wave in exhaust pressure was decreased. When the pipe diameter was increase, the second amplitude was increased.