Abstract
A computational study of coupled turbulence, chemistry, and radiation interactions in an idealized strongly sooting and radiating nonpremixed turbulent jet flame has been conducted. The two-dimensional, density-weighted, spatially-filtered compressible Navier-Stokes, energy and species equations were numerically integrated using a second-order time, fourth-order space accurate compact finite-difference scheme in the context of the Large Eddy Simulation (LES) technique. The subgrid-scale (SGS) stress tensor, scalar flux vectors, and related subgrid correlations were closed using the dynamic Smagorinsky turbulence model. An idealized single-step, irreversible exothermic chemical reaction of the type F+rOx → (1+r)P with Arrhenius kinetics was employed. The filtered chemical source terms were closed using a new scale-similarity filtered reaction rate SGS combustion model. An extension of the laminar flamelet concept to soot in the form of a presumed soot volume fraction state relationship was also employed. The radiative transfer equation was integrated using an S4 level discrete ordinates method and the gray gas assumption. The results show that the LES model is able to capture several unique features of strongly radiating turbulent flames consistent with previous experimental and numerical observations, including the effects of radiative cooling on flame structure and the highly intermittent behavior of the soot volume fraction.
| Original language | English |
|---|---|
| Pages (from-to) | 123-129 |
| Number of pages | 7 |
| Journal | American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD |
| Volume | 357 |
| Issue number | 1 |
| State | Published - 1998 |
| Externally published | Yes |
ASJC Scopus subject areas
- Mechanical Engineering
- Fluid Flow and Transfer Processes