17/05/19 – M. Modest – Models for Radiative Heat Transfer and Radiation–Turbulence Interactions in Combustion Systems
Séminaire régulier IUSTI – 17 mai 2019 – 11h salle 250
Models for Radiative Heat Transfer and Radiation–Turbulence Interactions in Combustion Systems
Michael Modest – UC Merced, ÉU
Predicting radiative transfer rates in high-temperature reacting flows is an extremely difficult task, because the radiative transfer equation (RTE) is a six-dimensional integro-differential equation, and is exacerbated by the fact that radiative properties in reacting flows undergo extreme fluctuations across the electromagnetic spectrum. The problem encounters additional levels of difficulty in high-temperature plasmas, as found in the hypersonic shock layer in front of spacecraft entering an atmosphere, leading to thermochemical nonequilibrium, and in the presence of turbulence, leading to highly-nonlinear interaction terms. This talk will concentrate on spectral modeling of radiation from combustion gases and plasmas. The nature of radiative properties of high-temperature gases and plasmas will be reviewed, followed by a discussion of traditional as well as modern spectral methods, with emphasis on recent work carried out by the speaker in the field of combustion. Finally, some application examples will be presented.