engleski

Calculation of Radiative Heat Transfer in a Real Industrial Applications for More Accurate Modelling of Pollution Formation

Combustion systems will remain to have a part in the power and transport sectors during the energy transition, and therefore the development of cleaner combustion technologies and investigation of alternative sustainable fuels such as biofuels and energy vectors will continue. The main challenge with combustion systems is the formation of pollutant emissions that are harmful to the environment, and for that reason, the most of recent researches are focused on finding the principles of pollutant formation and reduction. A valuable tool for getting an insight into pollutant formation is Computational Fluid Dynamics (CFD), which is commonly used for three-dimensional calculation of emissions from the combustion process. Due to the additional computational demand, radiative heat transfer in some combustion simulations like internal combustion engine simulations is often not considered, which can result in significant discrepancies in emission calculations. In this work, radiative heat transfer in participating media was modelled with Discrete Ordinates Method (DOM) that employs the finite volume method discretisation. This model features spatial angle discretisation, where each spatial angle represents one ordinate for which the transport equation is solved. Firstly, the temperature results obtained by DOM radiation model were verified in comparison with Discrete Transfer Radiative Method (DTRM) on a furnace combustion chamber, where for the calculation of furnace combustion process, Steady Combustion model was used. Finally, the comparison between NOx and soot emissions on internal combustion engine case is presented for calculation without considering radiative heat transfer and with the DOM model. The results show a good trend toward the agreement with experimental data when the radiative heat transfer is considered in simulations.

Radiative Heat Transfer, Participating Media, Emission

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