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Choi, Seuk Cheun,Lee, Won-Ju,Roh, Beom-Seok,Park, Seul-Hyun Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.29
<P><B>Abstract</B></P> <P>The effect of elevated pressures on the soot formation in coaxial ethylene-diffusion flame was investigated under different ventilation conditions, i.e. one with a chamber valve closed and the other with a chamber valve open. Experimental measurements include the soot volume fraction and macroscopic flame behaviors such as visible height and flame shape. The presence of ventilation-assisted flow around the flame was found to further increase the visible flame radius and height at elevated pressures. The maximum soot volume fraction measured within the flame was also increased with the ventilation-assisted flow as well as with the ambient pressure. Experimental results clearly indicate that changes in the physical appearance of the flames altered by ventilation-assisted flow are an important factor to affect the sooting behavior in coaxial diffusion flames.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The presence of ventilation-assisted flow affects the appearance of flames. </LI> <LI> Changes in the appearance of flames are a critical factor for sooting behaviors. </LI> <LI> The maximum soot volume fraction increases with the ventilation-assisted flow. </LI> </UL> </P>
최석천(Seuk Cheun Choi),이용훈(Young Hun Lee),이상철(Sang Chul Lee),정한식(Han Shik Chung),이광영(Kwang Young Lee),정효민(Hyo Min Jeong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In the study, a computer analysis has been developed for predicting the pipe pressure of the in take and exhaust manifold in a 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 Characterisitic). The main numerical parameters are the variation of the exhaust pipe diameters to calculate the pulsating flow when the intake and exhaust valves are woking. As the results of numerical nanlysis, the shapes and distributions of the exhaust pipe pressures were influenced strongly on the cylimder pressure, As the exhaust pipe diamrter is decreased, the anplitude of exhaust pressure large and the eylinder pressure was showed low in the region of intake valve opening time.
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.
디젤엔진의 연료분사방법 및 부하가 연소 성능과 배출물 특성에 미치는 영향
최석천(Seuk Cheun Choi),노현구(Hyun Gu Roh),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
The purpose of this paper is to investigate the effects of fuel injection strategy and engine load on the combustion performance and emissions characteristics of a DI diesel engine with 1.58L of piston displacement. In order to analyze the particulate matter (PM) and exhaust emission characteristics in a direct injection diesel engine, the PM and exhaust emissions (including HC, CO and NOx,) were investigated under various injection strategies and engine loads. The results of this work indicate that the HC, CO and NOx emissions were increased in accordace with the engine loads. Also, the size of primary partice and radius of gyration are increased with the engine loads.
최석천(Seuk Cheun Choi),최문영(Mun Young Choi),박설현(Seul-Hyun Park) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The dimensionless extinction constants, Ke of soot produced from a small laminar flame burning ultra low sulfur diesel (ULSD) and soy methyl ester (B100) biodiesel fuel were measured in the visible (633㎚) wavelength. Experiments were performed at atmospheric pressure using a transmission cell in which simultaneous gravimetric sampling and light extinction techniques (GSLE) were employed. For the diesel soot, the average value of the Ke at 633nm was 11.1 whereas that of the Ke for biodiesel was 11.8 at the same wavelength. To quantitatively explain the difference in Ke in diesel and biodiesel soot, various factors including soot morphology and nanostructure were investigated.