대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제24권9호
  • /
  • Pages.1264-1276
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  • 2000
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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냉간시동시 자동차용 저온활성촉매의 성능 향상을 위한 수치적 설계

Numerical Design of Light-off Auto-Catalyst for Reducing Cold-Start Emissions

  • 정수진 (한양대학교 대학원 기계공학과) ;
  • 김우승 (한양대학교 기계산업공학부)
  • 발행 : 2000.09.01
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초록

Light-off catalyst has been used for minimization of cold-start emissions. Improved cold-start performance of light-off catalyst needs the optimal design in terms of flow distribution, geometric surface area, precious metal loading, cell density and space velocity. In this study, these influential factors are numerically investigated using integrated numerical technique by considering not only 3-D fluid flow but also heat and mass transfer with chemical reactions. The present results indicate that uneven catalyst loading of depositing high active catalyst at upstream of monolith is beneficial during warm-up period but its effect is severely deteriorated when the space velocity is above 100,000 $hr^{-1}$ To maximize light-off performance, this study suggests that 1) a light-off catalyst be designed double substrate type; 2) the substrate with high GSA and high PM loading at face be placed at the front monolith; and 3) the cell density of the rear monolith be lower to reduce the pressure drop.

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참고문헌

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