自動車用排気触媒の昇温解析 (<小特集>エンジンシステムの新展開)

概要

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Transient thermal characteristics of one-brick-type and multibrick-type catalytic converters were investigated by means of experiment and numerical simulation. Flow visualization using the laser-sheet method and temperature measurement using thermocouples was carried out. The experimental results show that the inlet gas velocity distribution of one-brick-type converters is roughly flat, while that inside the multibrick-type is high in the center and becomes flat gradually as the gas passes through each brick. During warm-up, the temperature distribution of the inlet gas has a difference of at least 70℃ between the center and inside wall surface. The catalytic converter simulation model considers heat and mass convection, gas-solid heat and mass transfer, heat conduction, chemical reactions and heat loss to the surroundings. The simulation also accounts for flow and temperature distribution of the inlet gas as boundary conditions. The calculations indicate that warm-up characteristics of the multibrick-type are partially superior to the one-brick-type converters, but the percentages of activated volumes are almost the same.
社団法人日本機械学会の論文
1995-10-25