Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame


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), 1695-1703. (doi:10.1016/j.proci.2008.05.041 ).

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Description/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.

Item Type: Article
ISSNs: 1540-7489 (print)
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 191089
Date Deposited: 16 Jun 2011 13:25
Last Modified: 27 Mar 2014 19:43
URI: http://eprints.soton.ac.uk/id/eprint/191089

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