LDV measurement,flow visualization and numerical analysis of flow distribution in a close-coupled catalytic converter |
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Authors: | Email author" target="_blank">Duk-Sang?KimEmail author Yong-Seok?Cho |
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Affiliation: | (1) Graduate School of Automotive Engineering, Kookmin University, 136-702 Seoul, Korea;(2) Graduate School of Automotive Engineering, Kookmin University, 136-702 Seoul, Korea |
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Abstract: | Results from an experimental study of flow distribution in a close-coupled catalytic converter (CCC) are presented. The experiments
were carried out with a flow measurement system specially designed for this study under steady and transient flow conditions.
A pitot tube was a tool for measuring flow distribution at the exit of the first monolith. The flow distribution of the CCC
was also measured by LDV system and flow visualization. Results from numerical analysis are also presented. Experimental results
showed that the flow uniformity index decreases as flow Reynolds number increases. In steady flow conditions, the flow through
each exhaust pipe made some flow concentrations on a specific region of the CCC inlet. The transient test results showed that
the flow through each exhaust pipe in the engine firing order, interacted with each other to ensure that the flow distribution
was uniform. The results of numerical analysis were quali-tatively accepted with experimental results. They supported and
helped explain the flow in the entry region of CCC. |
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Keywords: | Close-coupled Catalytic Converter Exhaust Gas After-Treatment Exhaust Gas Flow Distribution Flow Visualization LDV (Laser Doffler Velocimetry) Numerical Analysis |
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