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확산화염에서 시분해 레이저 유도 백열법을 이용한 매연입자 크기와 화염 온도의 영향에 관한 연구
한휘영(Hwi-young Han),김규보(Gyu-Bo Kim),이종호(Jong-Ho Lee),조승완(Seung-wan Cho),정동수(Dong-Soo Jeong),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An experimental investigation is reported about soot primary particle size and flame temperature in laminar ethylene diffusion flame. We use TIRE-LII(Time-resolved Laser Induced Incandescence) technique to measure soot primary particle size and rapid insertion method to measure flame temperature. LII(Laser Induced Incandescence) has wide applications for soot diagnostic. LII is the technique which heats the soot particle using a pulsed laser and detects the intense thermal emission from the particles. TIRE-LII uses the ratio of different two time at the LII temporal decay curve to decide the soot primary particle size. In this study, the measurement positions are 15,20,27.5,30㎜ height above the burner tip along the radial direction. Particle size was increased to 20㎜ and the decreased from 27.5㎜ to 30㎜. Central flame temperature was increased as going to the upper direction.
시분해 레이저 유도 백열법을 이용한 커먼레일 디젤 엔진 배기단 에서의 PM 측정
한휘영(Hwi-young Han),김규보(Gyu-Bo Kim),이종호(Jong-Ho Lee),조승완(Seung-wan Cho),정동수(Dong-Soo Jeong),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Recently, diesel vehicles are increased and their emission standards will become strict. Diesel exhaust contains numerous dangerous compounds expecially among them particle matter is a serious environmental pollutant and seriously hazardous for human health. Thousands of studies also have documented that particle matters are associated with respiratory and cardiovascular diseases and death. To understand soot formation and develop control strategies for soot emission, it is necessary to measure soot concentration and soot particle size in laboratory flames or practical engines. As a diagnostic to measure soot concentration laser induced incandescence has been used, and Time-Resolved laser induced incandescence has been used to determine soot particle size in flames and engines. In this work, the soot particle emission of turbochared 2.0 CRDI engine has been investigated within the raw exhaust gas and soot particles are measured in different engine loads.
레이저 소결 방식 3D 프린팅 시스템에서의 최적 치수 보정 프로세스 연구
한휘영(Hweeyoung. Han),하상호(Sangho. Ha),김남훈(Namhun. Kim),김현남(Hyeonnam. Kim),황철웅(Cheolwoong. Hwang),신현식(Hyunshik. Shin),박규종(Kyujong. Park) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
Recently, 3D printing (3DP) is spotlighted as an innovative production method having potentials to change the manufacturing businesses in various industries. Also, in automotive industry, companies widely recognize the 3D printing technology as a promising manicuring method, so that they utilize 3D printers in their design, development, research and production processes. In automotive industries, however, the application of 3D printing technology is still quite limited to design processes due to the low cost-effectiveness and the lack of engineering reliability. Especially, the selective laser sintering (SLS) 3D printers, known as offering high engineering quality and durability of products, are popularly used in auto part development processes, the dimensional displacements of the 3D printed parts, however, hinder automakers from utilizing the technology directly to enhance their development process. The SLS 3D printers normally produce curved shapes due to thermal deformation (thermal expansion and thermal contraction) caused in the powder sintering process, which accompanies two-phase deformations. In this research, we aim to investigate and analyze the deformation tendencies of SLS 3D printed samples by sizes, shapes, locations in the platform (on 3D Systems’ sPro60 SD). At the end of the paper, we propose an algorithm to predict the deformation and calibrate pointbased 3D cad STL files of samples to mitigate the dimensional deformation with simple shaped samples for the illustrative purposes.
커먼레일 직접분사식 디젤엔진에서 시분해 레이저 유도 백열법을 이용한 매연입자의 배출 특성
김규보,한휘영,장영준,전충환,Kim, Gyu-Bo,Han, Hwi-Young,Chang, Young-June,Jeon, Chung-Hwan 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Recently, diesel vehicles have been increased and their emission standards have been getting strict. The emission of diesel vehicles contains numerous dangerous compounds, especially particulate matters cause a serious environmental pollutant and affect to human health seriously. Thousands of studies have already reported that particulate matters are associated with respiratory and cardiovascular diseases, and death. Due to these, it is necessary to measure the soot concentration and soot particle size in laboratory flames or practical engines to recognize the soot formation, and develop the control strategies for soot emission. In this study, the characteristics of exhausted soot particle size and volume fraction from 2.0L CRDI diesel engine have been investigated as varying engine speed and load. Laser induced incandescence has been used to measure soot concentration. Time-resolved laser induced incandescence has been used to determine soot particle size in the engine. The soot volume fraction is increased as increasing engine load but soot volume fraction is decreased as increasing engine speed. The primary particle size is distributed about $35nm{\sim}60nm$ at each experimental conditions.