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강일환(Il-Hwan Kang),김형만(Hyung-Man Kim),왕학민(Hak-Min Wang),최갑승(Kap-Seung Choi) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
As fuel cells approach commercialization, hydrogen production becomes a critical step in the overall energy conversion pathway. Reforming is a process that produces a hydrogen-rich gas from hydrocarbon fuels. Hydrogen production via autothermal reforming (ATR) is particularly attractive for applications that demand a quick stan-up and response time in a compact size. However. further research is required to optimize the performance of autothermal reformers and accurate models of reactor performance must be developed and validated. The design includes the requirement of accommodating a wide range of experimental set ups. Factors considered in the design of the reformer are capability to use multiple fuels. ability to vary stoichiometry. precise temperature and pressure control, implementation of enhancement methods, capability to implement variable catalyst positions and catalyst arrangement, ability to monitor and change reactant mixing, and proper implementation of data acquisition. A model of the system was first developed in order to calculate flowrates, heating, space velocity, and other important parameters needed to select the hardware that comprises the reformer. Predicted performance will be compared to actual data once the reformer construction is completed. This comparison will quantity the accuracy of the model and should point to areas where further model development is required. The end result will be a research tool that allows engineers to optimize hydrogen production via autothermal reformation.
나선형 홈이 있는 브레이크 디스크의 열탄성불안정성에 대한 수치해석
정해일(Hae-Il Jung),최갑승(Kap-Seoung Choi),강일환(Il-Hwan Kang),왕학민(Hak-Min Wang),김형만(Hyung-Man Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The brake disc is the thermoelastic instability by the frictional heating during braking. In the present paper, the helical grooved vent brake disc is proved the thermoelastic instability by numerical analysis. The FEM analysis had been practiced for the comparisons of the thermoelastic instability and thermal deformation between the helical grooved vent brake disc and the conventional one.