Richardson, E.S., Yoo, C.S. and Chen, J.H.
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).
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The timing and location of autoignition can be highly sensitive to turbulent ?uctuations of composition. Second-order Conditional Moment Closure (CMC) provides transport equations for conditional (co)variances in turbulent reacting ?ows. CMC equations accounting for compressibility and di?erential di?usion are analyzed using data from direct numerical simulation of an autoignitive lifted turbulent hydrogen jet ?ame . At the ?ame 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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