Impact of the Inlet Flow Distribution on the Light-Off Behavior of a 3-Way Catalytic Converter

Julia Windmann; Joachim Braun; Peter Zacke; Steffen Tischer; Olaf Deutschmann; Jürgen Warnatz

doi:10.4271/2003-01-0937

2003-03-03

Impact of the Inlet Flow Distribution on the Light-Off Behavior of a 3-Way Catalytic Converter 2003-01-0937

Numerical simulations are increasingly assisting research and development in the field of emission control of automotive vehicles.

Our work focuses on the prediction of the tail-pipe emissions, based on a numerical simulation of the automotive catalytic converter. Besides the prediction of the tail-pipe emissions, an understanding of the processes occurring inside a monolithic catalytic converter implies new opportunities for the design of the optimum exhaust gas system.

In this paper, we present a three-dimensional transient numerical study of the influence of the velocity distribution in front of the inlet face on the thermal behavior of the monolith during the light-off of a 3-way catalytic converter. The differences in the thermal and chemical behavior due to the shape of the velocity distribution are discussed.

The recently developed code DETCHEM^MONOLITH /1/ is used for the numerical simulation. This code, for the first time, combines two-dimensional simulations of the reactive flow inside a large number of single monolith channels including a heterogeneous multi-step reaction mechanism with a transient simulation of the three-dimensional temperature field of the entire converter.

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Impact of the Inlet Flow Distribution on the Light-Off Behavior of a 3-Way Catalytic Converter 2003-01-0937

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