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Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis
Joint Authors
Swaminathan, N.
Gao, Y.
Chakraborty, Nilanjan
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-29, 29 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-04-03
Country of Publication
Egypt
No. of Pages
29
Main Subjects
Abstract EN
The statistical behaviours of the instantaneous scalar dissipation rate Nc of reaction progress variable c in turbulent premixed flames have been analysed based on three-dimensional direct numerical simulation data of freely propagating statistically planar flame and V-flame configurations with different turbulent Reynolds number Ret.
The statistical behaviours of Nc and different terms of its transport equation for planar and V-flames are found to be qualitatively similar.
The mean contribution of the density-variation term T1 is positive, whereas the molecular dissipation term (-D2) acts as a leading order sink.
The mean contribution of the strain rate term T2 is predominantly negative for the cases considered here.
The mean reaction rate contribution T3 is positive (negative) towards the unburned (burned) gas side of the flame, whereas the mean contribution of the diffusivity gradient term (D) assumes negative (positive) values towards the unburned (burned) gas side.
The local statistical behaviours of Nc, T1, T2, T3, (-D2), and f(D) have been analysed in terms of their marginal probability density functions (pdfs) and their joint pdfs with local tangential strain rate aT and curvature km.
Detailed physical explanations have been provided for the observed behaviour.
American Psychological Association (APA)
Gao, Y.& Chakraborty, Nilanjan& Swaminathan, N.. 2014. Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis. Journal of Combustion،Vol. 2014, no. 2014, pp.1-29.
https://search.emarefa.net/detail/BIM-1039866
Modern Language Association (MLA)
Gao, Y.…[et al.]. Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis. Journal of Combustion No. 2014 (2014), pp.1-29.
https://search.emarefa.net/detail/BIM-1039866
American Medical Association (AMA)
Gao, Y.& Chakraborty, Nilanjan& Swaminathan, N.. Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis. Journal of Combustion. 2014. Vol. 2014, no. 2014, pp.1-29.
https://search.emarefa.net/detail/BIM-1039866
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1039866