Direct measurement of mixture fraction in reacting flow using Rayleigh scattering

The mixture fraction variable, zeta, is very useful in describing reaction zone structure in nonpremixed flames. Extinction limits and turbulent mixing are often described as a function of this variable. Experimental evaluation of zeta is critical for improving our understanding of the influence of...

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Bibliographic Details
Published in:Experiments in fluids 1993-01, Vol.15 (4-5), p.247-254
Main Authors: GOIX, P. J, LEONARD, K. R, TALBOT, L, CHEN, J. Y
Format: Article
Language:English
Subjects:
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Theoretical studies. Data and constants. Metering
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Summary:The mixture fraction variable, zeta, is very useful in describing reaction zone structure in nonpremixed flames. Extinction limits and turbulent mixing are often described as a function of this variable. Experimental evaluation of zeta is critical for improving our understanding of the influence of turbulent mixing on the chemistry process. A fuel designed to permit measurements of mixture fraction by Rayleigh scattering technique only is presented. A Rayleigh intensity/mixture fraction correspondence has been obtained experimentally in a laminar coflow flame. The influence of strain rate and differential diffusion effects have been investigated using laminar counterflow diffusion flame and shifting equilibrium chemistry models. The results obtained from comparisons between experiments and these models are very encouraging and suggest that the Rayleigh/mixture fraction correspondence established is valid under both the turbulent mixing and laminar strained flamelet combustion regimes.
ISSN:0723-4864
1432-1114
DOI:10.1007/bf00223402