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바이오디젤과 디젤 연기입자의 광학특성 및 무차원광소멸계수 측정에 관한 연구
최석천,장영석,박설현,김연규 한국화재소방학회 2016 한국화재소방학회논문지 Vol.30 No.1
바이오디젤(Soy Methyl Ester, B100)과 디젤(Ultra Low Sulfur Diesel, ULSD)의 연소과정에서 발생되는 연기입자의무차원 광소멸계수를 측정하였다. 무차원 광소멸계수는 633 nm의 He-Ne 레이저를 이용하여 광학적 방법으로 측정된 연기입자의 체적분율과 중력식 필터법에 의해 채집된 연기입자의 체적분율을 비교하여 결정하였다. 633 nm 대역에서 측정된 평균 무차원 광소멸계수는 각각 바이오디젤의 연기입자가 11.8, 디젤 연기입자가 11.1으로 측정 불확도 범위(± 10.1%)내에서 거의 유사하였다. 다만, 라만 spectrum 분석결과를 통해 각 연료에서 발생된 연기입자 간의 광소멸(광흡수/광산란)특성은 서로 상이할 수 있음을 확인할 수 있었다. The dimensionless extinction constants of smoke particles produced from burning of soy methyl ester (B100) biodieseland ultra low sulfur diesel (ULSD) fuels were measured. To this end, optical measurements of smoke volume fractionwith the aid of a He-Ne laser at 633 nm were compared to the simultaneous gravimetric measurements. The average valueof measured dimensionless extinction constants at 633 nm was 11.8 for biodiesel smoke particles and 11.1 for dieselsmoke particles, respectively whose values are very comparable withing the range of measurement uncertainty (± 10.1%). The analysis of Raman spectroscopy revealed that overall characteristics of light extinction between particles producedfrom each fuel may differ from each other.
최석천,이용훈,전유신,허선철,정효민,정한식 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
The purpose of this research is to obtain the characteristics of strain and stress in the vacuum pressure vessel. The vacuum pressure vessel is used to many of industrial devices and cooling tower system. The vessel is under the vacuum pressure in this research, and we analyzed the stress on the vessel surface. As the experimental set up, we introduced the Static Strain Measurement(UCAM 70A, Kyowa) system. The environmental condition of vessel is reserved under vacuum pressure 50mmHg, and the vacuum pressure was made by a ejector pump system.
최석천(Seukcheun choi),이해종(Haejong Lee),김세현(Sehyun Kim),정한식(Hanshik Chung),이광영(Kwangyoung Lee),정효민(Hyomin Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. a computer analysis has been developed for predicting the pipe pressure of the intake and exhaust manifold. To obtain the boundary conditions for a numerical analysis, one dimensional and non-steady gas dynamic calculation is performed by using the MOC(Method Of Characteristic). The main numerical parameters are the variation of the engine revolution to calculate the pulsating flow which the intake and exhaust valves are working. The comparison of exhaust pressure in case of numerical results is quite matched with in case of experimental results. When engine revaluation is increased, the pressure amplitude showed a high value, but the pressure frequency was decreased.<br/>
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),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.
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.
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.