Improved chemical kinetic models for scramjet combustion simulation

Document Type

Conference Proceeding

Publication Date

7-2-2007

Abstract

This work reports improvements to detailed chemistry models, chemistry tabulation techniques, and reduced mechanisms. Pressure-dependent reaction rates for the CO-H2 system improve ignition delay predictions as a function of pressures for CO-H2 mixtures. Previous mechanisms did not even correctly predict the trends according to recent measurements. New features added to the ISAT algorithm improve speed by about a factor of two. These features include multiple-binary-tree data structures, reverse retrieval and growth, and tree trimming. A Peer-to-Peer implementation of the URan multiprocessor ISAT algorithm shows a slight advantage over the Master-Slave implementation in PaSR tests. A speed-up factor of 2.5 over the local ISAT implementation was found for four processors, but little additional speedup was found for eight processors. Skeletal and reduced mechanisms optimized for ignition delay give greater error in counterflow diffusion flames, but still perform reasonably well. The combination of quasi-steady-state reduced mechanisms and ISAT chemical source term tabulation appears to be a promising method of keeping a great deal of information from a detailed kinetic mechanism in a reacting flow CFD simulation.

Identifier

34250869538 (Scopus)

ISBN

[1563478900, 9781563478901]

Publication Title

Collection of Technical Papers 45th AIAA Aerospace Sciences Meeting

First Page

9487

Last Page

9496

Volume

14

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