Direct numerical simulations of mixing and reaction in a nonpremixed homogeneous turbulent flow
Abstract
The mechanisms of mixing and chemical reaction in a three-dimensional homogeneous turbulent flow under the influence of an A + B yields products type reaction are explored with the aid of direct numerical simulations. The pdf of a conserved Shvab-Zeldovich scale quantity (characterizing the mixing process) is found to evolve from an initial double-delta distribution to an asymptotic shape that can be approximated by a Gaussian distribution. The results indicate that Toor's (1975) hypothesis is not appropriate for the prediction of such flows, and that the best agreement with the present results for the initial and intermediate stages of mixing is achieved by a coalescence-dispersion (C/D) model which is between the closures of Dopazo-O'Brian (1976) and Janicka et al. (1979). It is noted that the final stages of mixing are not well represented by any of the C/D closure models considered.
- Publication:
-
Combustion and Flame
- Pub Date:
- August 1989
- DOI:
- 10.1016/0010-2180(89)90035-7
- Bibcode:
- 1989CoFl...77..171M
- Keywords:
-
- Combustible Flow;
- Computational Fluid Dynamics;
- Homogeneous Turbulence;
- Mixing Layers (Fluids);
- Three Dimensional Flow;
- Turbulent Flow;
- Asymptotic Methods;
- Coalescing;
- Combustion Chemistry;
- Combustion Physics;
- Normal Density Functions;
- Stoichiometry;
- Fluid Mechanics and Heat Transfer