This paper gives an overview of engine systems modelling by first and second law analysis. Complex engine systems are becoming more commonly implemented to meet the increasing demands of fuel efficiency and emission legislation. Future engine systems may also include both exhaust gas treatment and fuel processing devices. This leads to complex interactions within the thermodynamics and chemistry of powerplant systems. There is therefore a need to improve the systems modelling methods. This concerns first of all the composition tracking and the models of three-way catalytic exhaust converters and fuel processors. The applicability of gas dynamics modelling to chemically complex systems is also discussed. All these processes need to be modelled as interacting parts of one system.
A two-dimensional mathematical model of a monolithic catalyst support, based on a zonal approach, is developed to describe the heat interactions between the monolith channels. The development of such model is a step towards its incorporation in the complete thermal systems model of the propulsion powerplant. The model conservation equations are discretized using the ®nite volume method and a numerical solution method is presented. The model is validated using the experimental data available in literature for two cases: a steady state, non-reacting, non-adiabatic two-dimensional case and a transient (warm-up), one-dimensional reacting case. Comparison with literature experimental data showed good agreement. The zonal approach where multi-channel zones are used is demonstrated to provide robust and ecient simulation with signi®cantly reduced simulation times compared with a single channel per zone grid, without introducing large errors.
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