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황민영,김용균,전충환,송주헌,김용태,장윤한,Hwang, Min-Young,Kim, Yong-Gyun,Jeon, Chung-Hwan,Song, Ju-Hun,Kim, Yong-Tae,Chang, Youn-Han 한국전기화학회 2009 한국전기화학회지 Vol.12 No.2
리튬 2차전지는 휴대용 전자기기의 전원으로 사용되어 왔다. 최근 하이브리드 자동차, 전기자동차의 에너지 저장매체로써 적용으로 인해 시장 확대가 기대되고 있다. 양극 활물질은 리튬2차전지의 성능, 수명, 용량을 결정하는 물질이며, 급증하는 시장의 수요에 따라 양극 활물질을 대량으로 생산할 수 있는 기술을 개발하는 것이 시급하다. 본 연구에서 실제 양극 활물질($LiCoO_2$) 생산라인에서 가동 중인 소성로를 3D 모델링하였고, 수치적 해석을 통해 소성로 내부의 온도와 유동의 방향, 화학적 거동을 밝혀내었다. 결과로써, 생산량 증가로 인해 소성로에서 생성되는 $CO_2$ 농도가 증가하며 정체되는 지점을 확인하였고, TGA-DSC 실험을 통해 $CO_2$가 몰분율 15%이상에선 $LiCoO_2$의 적절한 형성에 영향을 주는 현상을 확인하였다. 또한 소성로의 형상변화와 공정조건의 변화를 통해 문제되는 $CO_2$를 원활히 배출할 수 있는 해결책을 제안하였다. Lithium secondary batteries have been widely used in the portable electric devices as power source. Recently it is expected that the realm of its applications expands to the markets such as energy storage medium of hybrid electric vehicle(HEV), electric vehicle(EV). Cathode active material is crucial in terms of performance, durability, capacity of lithium secondary batteries. It is urgent to develope the technology for mass production of cathode material to cope with the markets' demands in the near future. In this study, a calcination furnace running in real production line is modelled in 3D, and the thermal flow and gas flow after chemical reaction in the furnace is analyzed through numerical computations. Based on the results, it is shown that large volume of $CO_2$ gas is generated from chemical reaction. High concentration of $CO_2$ gas and it's stagnation is clearly found from the reactant containers in which the reaction occur to the bottom area of the furnace. It is also studied that 15% or more $CO_2$ mol fraction could affect to proper formation of $LiCoO_2$ through TGA-DSC analysis. The solutions to evacuate carbon dioxide from the furnace are suggested through the change of furnace design and operating condition as well.
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.
이석영(Suk-young Lee),전충환(Chung-\han Jeon),장영준(Young-june Chang) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
The concept of this engine was created by Ko in 1996 year. Performance simulation for this engine is presented in this paper. The volume of chamber at eccentric shaft angle is evaluated by using geometric models of rotor and rotor housing. A thermodynamic model which includes the first law of thermodynamics, combustion and heat transfer from chamber contents to surroundings is employed. Three processes of gas compression, combustion and expansion are considered and the pressure, temperature and heat release at each shaft angle in each process are computed in this performance simulation. If this engine is manufactured, this performance simulation must be useful for optimal design of this engine with parametric study for various design parameters and operating conditions.<br/>
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.
열전달 특성에 따른 전기용해로 내부 온도예측에 관한 수치적 연구
한동식(Dong-Sik Han),전충환(Chung-Hwan Jeon),장영준(Young-June Chang),송주헌(Ju-Hun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The main objective of this study is to analyze the heat transfer characteristics in the electric furnace. Local temperatures are measured at various locations in the furnace using the B-type thermocouples. In this paper, mathematical heat transfer model has been developed predict temperature distribution by considering the thermal radiation and transient conduction effect on heating element, crucible and furnace walls. The numerical simulation was performed using the ANSYS-Workbench software, and its results were compared with experimental data. The computational results show that the temperature distributions agreed well with experimental results. Finally, a difference in temperature behavior of the crucible was investigated as some heat transfer parameters change.
분사각 및 홀 직경 변화에 따른 박용디젤엔진 분무특성에 관한 수치해석 연구
한동식(Dong-Sik Han),이병화(Byoung-hwa Lee),배명직(Myung-Jik Bae),장영준(Young-June Chang),전충환(Chung-Hwan Jeon),송주헌(Ju-hun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
It is very important to understand spray characteristics and fuel injection conditions in direct-injection diesel engine because emission gas compositions from diesel engines are closely related to spray formation processes. In this study, the characteristics of diesel spray has been studied using a computational fluid dynamics code, named STAR-CD. Reitz & Diwarkar model was used for the breakup models while standard k-ε turbulence model was consider for the compressibility effect due to moving process of piston. In this paper, the numerical simulation was performed to study the spray characteristics such as vapor mass fraction, evaporation rate and SMD and their impact on engine performance.
정적연소기내 CRSP 설계인자에 따른 연소특성에 관한 실험적 연구
양인규(In-gyu Yang),한동식(Dong-sik Han),김현규(Hyun-kyu Kim),장영준(Young-june Chang),송주헌(Ju-hun Song),전충환(Chung-hwan Jeon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Natural gas is a promising alternative fuel to meet strict engine emission regulations in many countries. A natural gas engines achieve low emissions but the demand is for better fuel consumption, increased ratings. This study focuses on a cylindrical Constant Volume Combustion Chamber(CVCC) was used to investigate the combustion characteristics under various Combustion Radical Spark Plug(CRSP) design parameters and different equivalence ratio. The maximum combustion pressure and mass fraction burned of combustion was effected by the CRSP orifice diameter, volume ratio and equivalence ratio. This paper shows optimum parameters of CRSP according to combustion characteristics with design parameters.
이종호,박철웅,한영민,고영성,이수용,양수석,이대성,전충환,장영준,신현동,한재원,Lee, Jong-Ho,Park, Chul-Woong,Han, Yeoung-Min,Ko, Young-Sung,Lee, Su-Yong,Yang, Soo-Seok,Lee, Dae-Sung,Jeon, Chung-Hwan,Chang, Young-June,Shin, Hyun-Dong,Ha 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
Performance of a gas turbine combustor installed in a test facility has been studied by measuring spatially- and temporally-resolved temperature distributions using multiplex CARS technique. 500 CARS temperatures were determined at each measuring point to obtain a histogram of temperature distribution. Experiments were carried out in the aero-engine combustor sector rig burning standard kerosene fuel. The histograms were obtained around a triple-sector double annular rig running in ground idle conditions, showing features of flow mixing within the rig. The temperature histograms that prove the existence of high temperatures above 1900 K provide us valuable information to improve the design of the combustor structure suppressing NOx generation in turbulent combustion processes. The effects of swirl direction and pre-filmer on gas turbine combustion were investigated. When we installed radial swirls, a large recirculation zone was formed by the fuel module regardless of swirl directions and the pre-filmer installation. It is found that the swirl direction affects the shape of the reverse flow zone, however. Also, an attempt to estimate the flow field and flame structure is made using the histogram of temperature determined with the CARS technique.