Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame
Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame
The timing and location of autoignition can be highly sensitive to turbulent fluctuations of composition. Second-order Conditional Moment Closure (CMC) provides transport equations for conditional (co)variances in turbulent reacting flows. CMC equations accounting for compressibility and differential diffusion are analyzed using data from direct numerical simulation of an autoignitive lifted turbulent hydrogen jet flame [1]. At the flame base, second-order moments were required to accurately model the conditional reaction rates. However, over 80% of the second-order reaction rate component was obtainable with a small subset (16%) of the species-temperature covariances. The balance of the second-order CMC equation showed that turbulent transport across spatial composition gradients initiates generation of conditional variances.
1695-1703
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Yoo, C.S.
3e57efec-fb73-4e27-b690-47dfb99ef9c8
Chen, J.H.
fd295f97-acff-4984-a655-ee18d3b2a734
2009
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Yoo, C.S.
3e57efec-fb73-4e27-b690-47dfb99ef9c8
Chen, J.H.
fd295f97-acff-4984-a655-ee18d3b2a734
Richardson, E.S., Yoo, C.S. and Chen, J.H.
(2009)
Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame.
Proceedings of the Combustion Institute, 32 (2), .
(doi:10.1016/j.proci.2008.05.041).
Abstract
The timing and location of autoignition can be highly sensitive to turbulent fluctuations of composition. Second-order Conditional Moment Closure (CMC) provides transport equations for conditional (co)variances in turbulent reacting flows. CMC equations accounting for compressibility and differential diffusion are analyzed using data from direct numerical simulation of an autoignitive lifted turbulent hydrogen jet flame [1]. At the flame base, second-order moments were required to accurately model the conditional reaction rates. However, over 80% of the second-order reaction rate component was obtainable with a small subset (16%) of the species-temperature covariances. The balance of the second-order CMC equation showed that turbulent transport across spatial composition gradients initiates generation of conditional variances.
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Published date: 2009
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Funded by U.S. Department of Energy: Sandia National Laboratories (DE-AC04-94-AL85000)
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Local EPrints ID: 191089
URI: http://eprints.soton.ac.uk/id/eprint/191089
ISSN: 1540-7489
PURE UUID: f084a0e1-b895-4e29-879b-9154103b2b5e
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Date deposited: 16 Jun 2011 13:25
Last modified: 15 Mar 2024 03:37
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Author:
C.S. Yoo
Author:
J.H. Chen
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