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Title: A Study of Strain Rate Effects for Turbulent Premixed Flames with Application to LES of a Gas Turbine Combustor Model

Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of GE lean premixed dry low NOx emissions LM6000 gas turbine combustor model. A novel approach which is based on the coupling of the lineareddy model with a one-dimensional counter-flow solver has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable, the local strain rate measure, and local Reynolds and Karlovitz numbers. The strain rate effects have been analyzed by comparing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects, with available experimental data. The sensitivity of the simulation results to the inflow velocity conditions as well as the grid resolution have been also studied. Overall, the results suggest the necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.
 [1] ;  [1]
  1. Combustion Research and Flow Technology, Inc., Huntsville, AL (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
SC0004465; AC02-05CH11231
Accepted Manuscript
Journal Name:
Flow, Turbulence and Combustion
Additional Journal Information:
Journal Volume: 94; Journal Issue: 4; Journal ID: ISSN 1386-6184
European Research Community on Flow, Turbulence and Combustion (ERCOFTAC)
Research Org:
Combustion Research and Flow Technology, Inc., Huntsville, AL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
33 ADVANCED PROPULSION SYSTEMS Large-eddy simulation; Turbulent premixed flames; Turbulent flame speed; Strain rate