The sensitivity of lean combustion to stratification level was studied in a turbulent flow field for the turbulent stratified flames configuration. Differential diffusion caused by the flux of species e.g. H2 was identified for all stratification levels. The effect of stratification onto the flame micro-structure was evident in the pre- heat zone and in the reaction zone as shown by the means of the local equivalence ratio. The temperature profiles in this back-supported configuration were more impacted on the reactant side than on the product side by stratification. In contrast equivalence ratios as well as mass fractions of hydrogen were sensitive to stratification on the product side as well as in the reactants.
Bibliographical noteFunding Information:
We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) through DR 3 74/13 and GE 2523/1 . A. Dreizler was financially supported by the Gottfried Wilhelm Leibniz-Preis (DFG). Work at Sandia was supported by the United States Department of Energy , Office of Basic Energy Science, and Biosciences. Sandia National Laboratories is a multiprogram operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94-AL85000 . The authors also thank Bob Harmon for his contributions to the experiments.
- Lean-premixed combustion
- Multiple conditioned data analysis
- Raman/Rayleigh scattering
- Stratified flames
- Turbulent combustion
ASJC Scopus subject areas
- General Chemical Engineering
- Mechanical Engineering
- Physical and Theoretical Chemistry