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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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 . 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.
|Subjects:||T Technology > TJ Mechanical engineering and machinery|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||16 Jun 2011 13:25|
|Last Modified:||15 May 2014 15:01|
Sandia National Laboratories
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