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성형 이력을 고려한 용융탄산염 연료전지용 금속 분리판의 압축 거동 특성 분석
이창환(C. W. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The metallic bipolar plates of the molten carbonate fuel cell (MCFC) are composed of shielded slot plates and a center plate. The shielded slot plate supports the center-plate and the membrane electrode assembly. In order to increase the contact area between shielded slot plates and the membrane electrode assembly, compressive forces are applied to the shielded slot plate. For these reasons, it is necessary to predict the mechanical behavior of the shielded slot plate. Because the shielded slot plates are manufactured from the three-stage forming process, the mechanical behavior of the shielded slot plate is largely affected by the forming process. In order to predict the mechanical behavior of the shielded slot plate precisely, the forming process of the shielded slot plate should be considered. In this study, simulation results of the forming process were employed to the simulation of the mechanical behavior of the shielded slot plate to consider the forming effect. The proposed simulation model considering the forming effect shows good agreements with the experimental results.
용융탄산염 연료전지용 금속분리판의 굽힘변형에 관한 연구
이성욱(S. U. Lee),성대용(D. Y. Seong),이창환(C. H. Lee),양동열(D. Y. Yang),강동우(D. W. Kang),이태원(T. W. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The electrolyte matrix (MEA) of MCFC is used for electronic insulation and ionic communication between electrodes. Due to the weak mechanical strength of ceramic materials, the matrix is easy to crack when the cells are moved and stacked. In this study, bonding between the shield slot plate and the electrode is used to prevent the crack. Bonding reduces the deflection of MCFC cells, bending behavior in particular. The small deflection of matrix is derived from the bonded structure of MCFC cells. Under 3-point bending test with the bonded structures, it is shown that the bonded structure is strong against bending. Bonding between the shield slot plate and the electrode is necessary to prevent the crack of the matrix.
벽면 열전달을 고려한 항공기 노즐 표면의 온도 변화 연구
강동우(D.W. Kang),김인덕(I.D. Kim),장민욱(M.U. Jang),명노신(R.S. Myong),김원철(W.C. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The temperature changes on nozzle surface are investigated for the purpose of analysing the infrared signature level of aircraft propulsion system. A virtual subsonic aircraft is first selected and then a convergent nozzle, which meets the mission requirements, is designed. Using a compressible CFD code, an analysis of thermal flow field and nozzle surface temperature distribution is conducted. Finally, qualitative information for the effect of wall heat transfer on temperature changes of aircraft nozzle surface is obtained.