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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.
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),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.
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.
F-76 선박용 디젤유 및 JP-8 항공유 입자상물질의 광학 및 물리적 특성에 대한 실험적 연구
최재혁,최석천,김대용,이주희,박설현,Choi, Jae-Hyuk,Choi, Seuk-Cheun,Kim, Dae-Yong,Lee, Joo-Hee,Park, Seul-Hyun 해양환경안전학회 2014 해양환경안전학회지 Vol.20 No.6
F-76 선박용 디젤유와 JP-8 항공유의 연소과정에서 발생되는 입자상물질(PM)의 무차원 광소멸계수를 Transmission Cell를 이용하여 측정하였다. 무차원 광소멸계수의 측정방식은 각각 광원의 파장길이가 633 nm와 853 nm인 대역에서 중력식 필터법에 의해 채집된 PM의 농도와 광학적 방법에 의해 측정된 PM의 농도를 비교하는 방법을 통해 이루어졌다. 광원의 파장길이, 633 nm 대역에서 측정된 무차원 광소멸계수는 F-76의 연료에서 발생된 PM의 경우 8.8인 반면 JP-8 연로부터 생성된 PM의 경우 9.8이였다. 한편 광원 파장길이가 853 nm로 증가함에 따라 두 연료 모두에서 발생된 PM의 무차원 광소멸계수는 각각 8.2 (F-76)와 8.8 (JP-8)로 감소하는 경향을 나타내었다. The dimensionless extinction constants of particulate matter for F-76 diesel and JP-8 aviation fuels were measured at both 633 nm and 853 nm in the transmission cell where the simultaneous gravimetric measurement of PM concentration is compared to the light extinction measurement. For the F-76 diesel PM, the average value of the dimensionless extinction constants at 633 nm was 8.8 whereas that of the dimensionless extinction constants for JP-8 was 9.8 at the same wavelength. As the wavelength is increased to 853 nm, the average value for the F-76 diesel was reduced to 8.2 whereas that for JP-8 was decreased to 8.9.
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.