Analyses of conditional moment closure for turbulent premixed flames

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By this author: N. Swaminathan ;&nbsp; R.W. Bilger

Authors: N. Swaminathan; R.W. Bilger

Source: Combustion Theory and Modelling, Volume 5, Number 2, June 2001 , pp. 241-260(20)

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Abstract:

Direct numerical simulation data sets of turbulent hydrogen-air premixed flames with [iopmath latex="$uˆ{prime}/S_l approx 30$"] u'/S_l30 [/iopmath] are analysed with a view to model development. Conditional moment closure (CMC), an alternative to the flamelet approach for turbulent flames with high [iopmath latex="$uˆ{prime}/S_l$"] u'/S_l [/iopmath] , is studied using the above DNS database. Variation of different terms in the CMC equation is studied. A priori tests of the conditional reaction rate closure are carried out. It seems that the first moment closure strategy, the conditional reaction rate as a function of conditional averages, is good. A simple model is proposed for differential diffusion of heat and mass from the CMC point of view and the predictions of the model are found to be very good. Behaviour of conditional streamwise velocity is studied. Three different models for the conditional velocity are tested a priori using the DNS data.

Document Type: Miscellaneous

Affiliations: 1: Author to whom correspondence should be addressed. Present address: GE India Technology Center, Bangalore, India.

Publication date: 2001-06-01