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Modeling the Effect of Flow Pulsations in Close-Coupled Catalytic Converter Light-Off
Technical Paper
2004-01-1835
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In close-coupled catalytic converter applications, the exhaust gas mass flow may present fluctuations with a timescale in the order of milliseconds, as a result of periodic valve operation. Such flow pulsations are likely to affect catalytic converter performance, due to mass transfer limitations. A fully transient channel model is developed, to study pollutant conversion under pulsating flow conditions. This model is applied to evaluate the effect of pulsations in catalyst conversion. Firstly, the effect of flow pulsations during the warmed-up operation is studied. Then, we focus on the effect of pulsations during the light-off phase, during which significant temperature and therefore activity gradients are observed in the monolith. The new model is also used to assess the accuracy of the traditional “quasi-steady state” approach, when applied to simulate converters under pulsating flow.
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Authors
Citation
Tsinoglou, D. and Koltsakis, G., "Modeling the Effect of Flow Pulsations in Close-Coupled Catalytic Converter Light-Off," SAE Technical Paper 2004-01-1835, 2004, https://doi.org/10.4271/2004-01-1835.Also In
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