Investigation of Subgrid-Scale Mixing and Turbulence-Chemistry Interaction in Turbulent Partially Premixed Flames

Abstract

This research project focused on issues met in using large-eddy simulation (LES) to predict turbulent nonpremixed/partially premixed combustion. In LES of such flames the subgrid-scale scalar mixing and the resulting subgrid-scale scalar distributions must be faithfully represented. In this research the mixture fraction filtered mass density function (FMDF) and the FMDF of mixture fraction and temperature were studied experimentally using data from Sandia flames. The results show that the subgrid-scale mixture fraction has two limiting distributions and structures, which have strong effects on the flame structure. The SGS fields with small and large SGS variance the scalar and temperature dissipation structures were consistent with those in quasi-equilibrium distributed reaction zones and strained laminar flamelets, respectively.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 13, 2009
Accession Number
ADA500426

Entities

People

  • Chenning Tong

Organizations

  • Clemson University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Chemical Reactions
  • Chemistry
  • Combustion
  • Diffusion
  • Dissipation
  • Equations
  • Extinction
  • High Temperature
  • Low Temperature
  • Payload
  • Probability
  • Raman Scattering
  • Scattering
  • Temperature Gradients
  • Turbulence
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers