Influence of Turbulent Scalar Mixing Physics on Premixed Flame Propagation
The influence of reactive scalar mixing physics on turbulent premixed flame propagation is studied, within the framework of turbulent flame speed modelling, by comparing predictive ability of two algebraic flame speed models: one that includes all relevant physics and the other ig...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2011-01-01
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| Series: | Journal of Combustion |
| Online Access: | http://dx.doi.org/10.1155/2011/451351 |
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| Summary: | The influence of reactive scalar mixing physics on turbulent premixed flame propagation is studied, within the framework of turbulent flame speed modelling, by comparing predictive
ability of two algebraic flame speed models: one that includes all relevant physics and the other ignoring dilatation effects on reactive scalar mixing. This study is an extension of a previous
work analysing and validating the former model. The latter is obtained by neglecting modelling terms that include dilatation effects: a direct effect because of density change across the
flame front and an indirect effect due to dilatation on turbulence-scalar interaction. An analysis of the limiting behaviour shows that neglecting the indirect effect alters the flame speed scaling
considerably when 𝑢/𝑠𝑜𝐿 is small and the scaling remains
unaffected when 𝑢/𝑠𝑜𝐿 is large.
This is evident from comparisons of the two models with experimental data which show that the quantitative difference between the two models is as
high as 66% at 𝑢/𝑠𝑜𝐿=0.3 but only 4% at 𝑢/𝑠𝑜𝐿=52.4. Furthermore, neglecting the direct effect results in a poor prediction of turbulent flame speed for all values of 𝑢/𝑠𝑜𝐿, and both effects are important for practically relevant values of this velocity ratio. |
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| ISSN: | 2090-1968 2090-1976 |