1D Thermo-Fluid Dynamic Modeling of Reacting Flows inside Three-Way Catalytic Converters

Document Number: 2009-01-1510

Date Published: April 2009

Author(s):
Gianluca Montenegro - Politecnico di Milano
Angelo Onorati - Politecnico di Milano

Abstract:
In this work a detailed model to simulate the transient behavior of catalytic converters is presented. The model is able to predict the unsteady and reacting flows in the exhaust ducts, by solving the system of conservation equations of mass, momentum, energy and transport of reacting chemical species. The engine and the intake system have not been included in the simulation, imposing the measured values of mass flow, gas temperature and chemical composition as a boundary condition at the inlet of the exhaust system. A detailed analysis of the diffusion stage triggering is proposed along with simplifications of the physics, finalized to the reduction of the calculation time. Submodels for water condensation and its following evaporation on the monolith surface have been taken into account as well as oxygen storage promoted by ceria oxides. Moreover, the interaction between the gas and the deposited water film has been modeled to simulate the effect of water dragging inside the monolith channel. The validation of the model has been carried out on the basis of experimental measurements during hot and cold start at fixed engine operating conditions.

File Size: 914K
Product Status: In Stock

Included in: V118-3

See other papers presented at SAE World Congress & Exhibition, April 2009, Detroit, MI, USA, Session: Modeling of SI and Diesel Engines (Part 6 of 7) Engine Process Simulation and Integrated Simulation Methods

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