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Numerical Modelling of Radiative Heat Transfer in a Direct Injection Diesel Engine

It is known that the radiative heat transfer has an impact on the overall heat transfer and emissions in the engineering systems that operate at high temperatures. The radiative heat transfer models within Computational Fluid Dynamics (CFD) are commonly applied to evaluate the impact of the radiative heat transfer on overall temperature field, and then indirectly on the emission formation in the combustion system. In this work, the Discrete Ordinates Method (DOM) featuring Finite Volume Method (FVM) was implemented into the CFD software AVL FIRE™. In order to calculate the radiative transfer equation, user functions were used to couple the implemented model with existing code. The absorptivity and emissivity were modelled with a grey gas Weighted-Sum-of-Grey-Gases Model (WSGGM) based on non-isothermal and non-homogeneous correlations for H2O, CO2 and soot. The whole procedure was implemented to work with parallel computing, moving meshes and rezoning process. The implemented model achieved a good agreement with simple geometry validation cases for which the analytical results are available in the literature. A particular focus of this work was to apply implemented DOM FVM radiation model for evaluation of the radiative heat transfer in participating media of the IC engine. Obtained mean pressure, mean temperature, and the rate of heat release were in good agreement with the experimental data. Finally, it can be stated that the implemented models can serve as a fast-computational procedure for the investigation of the radiative heat transfer in diesel engines.

Radiative Heat Transfer, Participating Media, Finite Volume Method, Engine

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