1987-11-01

The Application of MAGIC Internal Combustion Engine Model: Turbulent Combustion Results 872101

The MAGIC (Modelling Algorithm for Generic Internal Combustion Engines) IC engine simulation model provides a two-dimensional finite difference solution of the fluid, thermal, chemical, and turbulent state in the cylinder of an internal combustion engine. In the present paper model capabilities, along with simulation studies that demonstrate those capabilities, are summarized in the course of describing results of a two-dimensional turbulent combustion simulation. The calculation exercises most model capabilities to simulate the turbulent flame evolution in a highly swirling and highly turbulent pancake-shaped combustion bomb. Bomb conditions are relevant to advanced-concept IC engine operation. The calculation demonstrates the generalized coordinate system numerical method, the treatment of axisymmetric swirl, the two-equation turbulent model with wall heat transfer, the treatment of multi-species hydrocarbon chemistry, the ignition submodel, and the novel “Eddy-Burn-Rate” turbulent reaction rate closure model. The only model features not exercised are the general grid motion algorithm, the fuel injection model and the valve orifice model. Results of the simulation are compared to available experimental data as well as to previous one-dimensional results that used alternative reaction rate closure models. The computation indicates that the complete combustion event from ignition to burnout can be simulated in a multi-dimensional model that models the initial fluid/turbulent state, the flame/flow evolution and the thermal/dynamic wall interaction.

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