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정구섭,전충환,장영준 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.6
Recently, the efforts to improve fuel economy and to reduce pollutant emission have become the main subject in the development of a gasoline engine. A lean combustion engine admitted as the best alternative is relatively lower fuel consumption rate and exhaust emissions. In this study, it is focused on intensifying intake flow field as one of methods to improve the performance of the lean combustion. First, three different types of suitable swirl control valve(SC7) with high swirl and tumble ratio are selected through steady flow experiment, being installed in a spark ignition engine. The relationship between lean misfire limit and torque was investigated with injection timing and spark ignition timing. Also, the effect of intensified swirl new on the combustion Stability and exhaust emissions was experimently examined by the measuring in-cylinder pressure and combustion variation. The results show that the engine with swirl control calve is superior to other conventional engine on the lean misfire limit, specific torque, combustion variation and emission, and the appropriate injection timing and spark ignition timing exist according to the type of swirl control valve.
SCV를 장착한 2밸브 Sl 가시화기관의 연소특성에 관한 연구
정구섭,전충환,장영준,Jeong, Gu-Seop,Jeon, Chung-Hwan,Jang, Yeong-Jun 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
This study describes the combustion characteristics under various condition of air excess ratio and ignition timing in a 2-valve SI optically accessible engine with swirl control valve(SCV). It adapted three different types of SCV(open ratio 72.5%, 78%, 59%) to strengthen a swirl flow. Pressure data were acquired using pressure sensor to investigate the effect of swirl flow on combustion, and from these pressure data, IMEP(indicated mean effective pressure) and MFB(mass fraction burnt) were calculated to explain burn rate and flame speed. From acquired flame images, we inspected the flame propagation direction, flame area, and flame centroid. Flame propagation direction showed different tendency between with/without SCV, and flame area with SCV was faster and larger than that of conventional engine. Finally, the representative flame images at each crank angle were acquired by PDF method to verify flame growth process. It is found that strengthened swirl flow is more beneficial for faster and stable combustion.
흡입 스월유동이 가솔린 가시화엔진의 연소에 미치는 영향에 관한 연구
정구섭,정용욱 진주여자전문대학 2002 論文集 Vol.25 No.-
This study describes the combustion characteristics under various condition of air excess ratio and ignition timing in a 2-valve gasoline optically accessible engine with swirl control valve(SCV). It adapted three different types of SCV(open ratio 72.5%, 78%, 89%) to strengthen a swirl flow. Pressure data were acquired using pressure sensor to investigate the effect of swirl flow on combustion, and from these pressure data, IMEP(indicated mean effective pressure) and MFB(mass fraction burnt) were calculated to explain burn rate and flame speed. From acquired flame images, inspected the flame propagation direction, flame area, and flame centroid. Flame propagation direction was shown different tendency between with/without SCV, and flame area with SCV was faster and larger than that of conventional engine. Finally, the representative flame images at each crank angle were acquired by PDF method to verify flame growth process. It is found that strengthened swirl flow is more beneficial for faster and stable combustion.
NC 데이터 자동생성을 위한 정사영 베이스의 특징형상 인식 및 추출
정구섭 진주여자전문대학 1996 論文集 Vol.19 No.-
This paper presents a feature recognition system for recognizing and extracting feature information needed for machining data from design data produced by CAD system. In this study, the developed system carried out feature recognition from the orthographic view of press mold containing not only atomic features such as holes, pockets, slots, but also compound features. Based on the results of feature recognition, it generates a 3-D modeling of the press mold. The feature recognition system is composed of six modules : module for 3-view drawing input, function support module, view separation module, module for 3-view drawing recognition, feature recognition module, and 3-D solid modeling module The part for feature recognition of the system is developed by using Autolisp, while the part for 3-D solid modeling takes advantage of ADS and AME(3D solid modeller) provided by the AutoCAD environment. The system shows a good application which can interface the design and manufacturing stage in CAD/CAM system on PC level.
정구섭,김형준,전충환,장영준 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.1
This study describes the combustion characteristics under various condition of air excess ratio and ignition timing in a 2-valve gasoline optically accessible engine with swirl control valve(SCV). It adapted three different types of SCA(open ration 72.5%, 78%, 89%) to strengthen a swirl flow. Pressure data were acquired using pressure sensor to investigate the effect of swirl flow on combustion, and from these pressure data, IMEP(indicated mean effective pressure) and MFB(mass fraction burnt)were calculated to explain burn rate and flame speed. From acquired flame images, inspected the flame propagation direction, flame area, and flame centroid, Flame propagation direction was shown different tendency between with/without SCV, and flame area with SCV was faster and larger than that of conventional engine. Finally, the representative flame image at each crank angle were acquired by PDF method to verify flame growth process. It is found that strengthened swirl flow is more beneficial for faster and stable combustion.