Spreadsheet calculations of jets in crossflow: opposed rows of inline and staggered round holes

The objective of this study was to demonstrate and analyze empirical model results for jet-in-crossflow configurations which are typical in gas turbine combustors. Calculations in this paper, for opposed rows of round holes in both inline and staggered arrangements, were made with an Excel ® spreads...

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Bibliographic Details
Published inHeat and mass transfer Vol. 48; no. 2; pp. 413 - 424
Main Authors Holdeman, James D., Clisset, James R., Moder, Jeffrey P.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.02.2012
Subjects
Engineering
Engineering Thermodynamics
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Original
Thermodynamics
Stagger Arrangement
Round Hole
Mixture Fraction
Optimum Configuration
Downstream Distance
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Summary:The objective of this study was to demonstrate and analyze empirical model results for jet-in-crossflow configurations which are typical in gas turbine combustors. Calculations in this paper, for opposed rows of round holes in both inline and staggered arrangements, were made with an Excel ® spreadsheet implementation of a NASA-developed empirical model for the mean conserved scalar field. Results for cases of opposed rows of jets with the orifices on one side shifted by half the orifice spacing shows that staggering can improve the mixing, particularly for cases that would overpenetrate if the orifices were in an aligned configuration. For all cases investigated, the dimensionless variance of the mixture fraction decreased significantly with increasing downstream distance. The variation between cases at a given downstream location was smaller, but the “best” mixers for opposed rows of jets were found to be inline and staggered arrangements at an orifice spacing that is optimum for inline jets.
ISSN:0947-7411
1432-1181
DOI:10.1007/s00231-011-0913-6