Detailed chemistry, soot, and radiation calculations in turbulent reacting flows

The present work aims at a comprehensive approach for the simulation of turbulent reacting flows. In particular, it focuses on the modeling of detailed chemistry, detailed soot formation and oxidation, and the modeling of detailed radiative heat transfer in gas-phase turbulent flames. In addition, the present work centers on numerical investigations of oxygen-enriched turbulent nonpremixed flames.; Issues that arise in calculating detailed chemistry, soot formation and oxidation, and thermal radiation in turbulent reacting flows are reviewed and discussed. Two detailed models of turbulent combustion are developed using state-of-the-art models of detailed chemistry, soot, and radiation calculations in turbulent flames. One of the models is based on an empirical description of the turbulent flow field and the other is based on CFD modeling of the flow field.; The empirical-description-based model is an extension of Two-Stage Lagrangian (TSL) model of turbulent jet flames. This extension includes the incorporation of a detailed soot model and the improvement of the radiation model. The soot model is a detailed one adopted from Appel-Bockhorn-Frenklach's soot model. The dynamics of soot particles are described by the method of moments adapted to the TSL formulation. The original constant-emissivity radiation model is improved by solving the radiative transfer equation on the spatial configuration of the TSL model using the spherical harmonic P1 method and the discrete ordinate S2 method. The gray medium assumption is employed and the Planck-mean absorption coefficient is used to determine the radiative properties of both gas-phase species and soot particles. With the extended TSL model, the characteristics of soot; radiation and NOx emissions in oxygen-enriched flames are studied.; The CFD-based model is based on an engineering CFD code (GMTEC) and it solves the compressible flow equations on unstructured meshes. GMTEC is extended by incorporating a detailed chemistry model, a detailed soot model, and a detailed radiation model. The detailed chemistry model is based on the use of the CHEMKIN libraries, and the calculations of chemistry are accelerated by using the ISAT software. (Abstract shortened by UMI.)...