COMPUTATIONAL MODELING OF RADIATION HEAT TRANSFER IN NON-PREMIXED TURBULENT FLAMES
Numerical simulation results are presented for the turbulent non-premixed flames Sandia Flame −D and Delft Flame III (piloted jet flames) and Sydney НМ1 (a bluff body flame). Turbulence is represented by a Reynolds stress transport model (RSM), while a steady laminar flamelet model, based on a C1 skeletal scheme, serves as chemistry model. The conserved scalar approach with pre-assumed β-PDF is applied to account for the turbulence-chemistry interaction. The discrete ordinate method (DOM), in a finite volume formulation, is used for radiative heat transfer calculations, the radiative properties being calculated by the Weighted Sum of Gray Gases Model (WSGGM). Interaction between turbulence and radiation is neglected in the results presented. Under these circumstances, it is illustrated that inclusion of radiation does not influence the flow and mixing fields, both in terms of mean values and rms values of fluctuations. Only a small reduction of mean temperature is observed, due to the net heat loss due to radiative emission.