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용융탄산염 연료전지용 금속 분리판의 기계적 거동 분석 및 균질화에 대한 연구
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동무(D. W. Kang),장인갑(I. G Chang),이태원(T. W. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Metallic bipolar plates of the MCFC(Molten Carbonate Fuel Cell) are composed of one center plate and two shielded slot plates. The unit cell of the shielded slot plate is trapezoidal in shape. From the analytical analysis of the simplified model of the unit cell, the stiffness and strength of simple deformation are obtained. FEM simulations were conducted to verify the analytical result. The homogenized material model for a plastically compressible anisotropic core is employed to simulate the mechanical behavior of the unit cell. The coefficients of the orthotropic elasticity and the yield criterion are obtained from the FEM simulation of the unit cell. The comparisons of the mechanical behaviors are made between the unit cell and the homogenized model.
연성파괴조건을 사용한 용융탄산염 연료전지용 금속 분리판의 성형 공정 유한요소 해석
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G Chang),이태원(T. W. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
The shielded slop plates of the molten carbonate fuel cell (MCFC) have a sheared corrugated trapezoidal pattern. In the FEM simulation of the shielded slot plate, the user material subroutine VUMAT is employed for the implementation of the ductile fracture criterion in the commercial FEM software ABAQUS. The experimental results of the shearing process were compared with the FEM simulation results in order to determine the critical damage value. Using this ductile fracture criterion, the three dimensional forming process of the shielded slot plate was numerically simulated. The effects of the shearing process on the forming process of the shieded slot plates were examined through FEM simulation and experiments. After springback the sheets shwo the warping due to the residual stress of the forming process.
용융탄산염 연료전지용 쉴디드 슬롯 플레이트의 압축 및 적층 특성 분석
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The unit cell of the molten carbonate fuel cell(MCFC) is composed of metallic bipolar plate, anode, cathode and matrix. Among these, the shielded slot plate (the current collector) supports the membrane electrode assembly (MEA) and the stack mechanically. Therefore the compression properties of the shielded slot plate are necessary to design the MCFC stack. In order to analyze the compression properties, experiments were conducted using the unit cell, the anode shielded slot plate(ACC) and the cathode shielded slot plate(CCC). For the properties of the MCFC stack, 4 layers of the metallic bipolar plate were used. The deformation of the MCFC stack depends on the deformation of the cathode shielded slot plate.
[디젤엔진] 디젤엔진의 Cavity Shape에 따른 KL치의 변화에 관한 연구
이태원(T.W. Lee),이선봉(S.B. Lee),하종률(J.Y. Ha) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present study deals with the effect of combusion chamber shape on in-cylinder soot oxidation characteristics of direct injection diesel engine. The anaylsed combustion chambers were a toroidal and a reentrant a reentrant with a projection(Complex). The two-color method was used to measure in-cylinder flame temperature and KL valve which is approximately proportional to the soot amount along the optical path. In addition, heat release rate was calculated from the in-cylinder pressure data. From this study, the soot oxidation of the reentrant and the complex which were strengthen squish flows went worse in late combustion period under heavy-load operation compared to that of the toroidal at retared fuel injection timing. It might be cause of the flame holding that squish lip depress the outflow of flame from the bowl to the entire combustion space.
디젤엔진에서 국소 순간 화염온도와 Soot 농도에 관한 연구
이선봉(S.B. Lee),이태원(T.W. Lee),정재철(J.C. Jung),이상석(S.S. Lee),하종률(J.Y. Ha) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The instantaneous flame temperature and soot formation and oxidation in a D. I. Diesel engine are easured using a two-color method. The proposed method based on the continuous spectral radition from the soot particles in flames is applicable to industrial Diesel engines without major modifications of their main characteristics. Measurements are performed at one location inside the combustion chamber of a D. 1. Diesel engine. Effects of diffrent engine speeds and loads, injection timings, piston cavitys on flame temperature and KL factor which is an index of soot concentrations were examined. A Little temperature change were observed with increasing rpm, while increased with loads. The higher the flame temperature is, the lower the KL factor is.<br/>
용융탄산염 연료전지용 금속분리판 굽힘 공정의 유한요소 해석을 통한 스프링백 분석
이창환(C. H. Lee),류승민(S. M. Ryu),양동열(D. Y. Yang),김영진(Y. J. Kim),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Metallic bipolar plate for molten carbonate fuel cell(MCFC) is composed of the shielded slot plate and the center plate. Among these, the center plate plays an important role in gas sealing. Therefore, manufacturing of the center plate is considered one of the key issues in MCFC. The center plate is manufactured by bending process. In bending process, springback and recoiling are two main problems. By using the modified punch shape with ‘step’ springback and recoil are reduced. The aim of this article is to find the effect of modified punch shape. So, the bending stress along thickness direction and material direction were investigated using FEM.