촉매변환기를 포함한 배기계의 3차원 비정상 유독특성 해석 = 3-Dimensional Unsteady Internal Flow Analysis of Exhaust system included in Catalytic converter

다국어 초록 (Multilingual Abstract)

A theoretical study of three-dimensional unsteady compressible non-reacting flow inside a pair of dual-monolith catalytic converters which attatched to 6-cylinder engine and has two Y type junctions at inlet is studied for the achievement of performance improvements,reduction of light-off time,and longer service life by improving the flow distribution of perturbating exhaust gases.
One dimensional non-steady gas dynamic calculation was also performed using method of characteristics in intake & exhaust system to obtain the boundary conditions to the 3-dimensional unsteady analysis. Studies indicate that unsteady representation is necessary because perturbation of gas velocity may affect gas flow uniformity on the surface of monolith. And simulation results show that the level of gas flow maldistribution in the monolith depends on interference at junctions due to the mass flow from the individual cylinders overlap in time, curvature and angle of separation streamline of exhaust pipes

목차 (Table of Contents)

• Abstract
• 1.서론
• 2.흡,배기계의 비정상 유동해석
• 3.3차원 CFD 해석
• 4.해석 모델 및 계산순서
• 5.결과 및 고찰
• 6.결론
• 참고문헌