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Numerical simulation of turbulenceñradiation interactions in turbulent reacting flows

Author(s): G. Li & M. F. Modest Abstract: Traditional modeling of radiative transfer in reacting flows has ignored the interactions between turbulence and radiation (TRI). Evaluation of radiative fluxes, divergences of flux and radiative properties have been based on mean temperature and concentration fields. However, both experimental and theoretical work have suggested that mean radiative quantities may differ significantly from those predictions based on the mean parameters because of their strongly nonlinear dependence on the temperature and concentration fields. Probability density function (PDF) methods have been found to be effective tools for the study of TRI. Such methods are able to treat turbulenceñradiation interactions in a rigorous way: many unclosed terms due to turbulenceñradiation interactions in the traditional Reynolds or Favre averaging process can be calculated exactly and all others can be accurately modeled by using the so-called optically thin-eddy approximation. This chapter shows the application of such methods in the study of TRI. On employing such methods many basic questions on TRI can be answered: (1) whether turbulenceñradiation interactions are important in turbulent flames or not; (2) if they are important, then what correlations need to be considered in a simulation to capture them. This chapter focuses on the introduction of such methods and their applications to diffusion flames. 1 Introduction: Most fires and commercial combustion processes, such as internal combustion engines and gas-turbine combustors, involve high temperatures and, therefore, radiation tends to make up an important fraction of heat transfer rates and, in some ... Pages: 33 Size: 882 kb Paper DOI: 10.2495/978-1-85312-956-8/03

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