LES Software for the Design of Low Emission Combustion Systems for Vision 21 Plants, Quarterly Report: July - September 2004

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Work in this quarter focused on the continued running of two SIMVAL cases: {phi} (equivalence ratio) of (1) 0.55 and (2) 0.625. Comparisons were made between RANS and LES predictions for the {phi} of 0.625 case. The LES calculation showed a different flow pattern in the combustor compared to the RANS calculation, in particular the combustor recirculation flow pattern on the centerline is dramatically different. To demonstrate that the LES solution is accurate (and the RANS is not), non-reacting cases based on the Lilley experiment (Lilley, 1985) were run. Results from the Lilley cases verified that the LES calculations more … continued below

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21 pages

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Meredith, Karl V. & Smith, Clifford E. October 2004.

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Work in this quarter focused on the continued running of two SIMVAL cases: {phi} (equivalence ratio) of (1) 0.55 and (2) 0.625. Comparisons were made between RANS and LES predictions for the {phi} of 0.625 case. The LES calculation showed a different flow pattern in the combustor compared to the RANS calculation, in particular the combustor recirculation flow pattern on the centerline is dramatically different. To demonstrate that the LES solution is accurate (and the RANS is not), non-reacting cases based on the Lilley experiment (Lilley, 1985) were run. Results from the Lilley cases verified that the LES calculations more closely match experimental velocity measurements for highly swirled, turbulent flows with a downstream constriction. In particular, RANS predictions show a strong centerline recirculation zone in the combustor, while LES predictions show positive axial velocity on the centerline, and an annular recirculation zone around the centerline. Animation files were also created this quarter, so as to better demonstrate the LES predictions.

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21 pages

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OSTI as DE00834997

Other Information: PBD: 1 Oct 2004

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  • Dec. 3, 2015, 9:30 a.m.

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Meredith, Karl V. & Smith, Clifford E. LES Software for the Design of Low Emission Combustion Systems for Vision 21 Plants, Quarterly Report: July - September 2004, report, October 2004; Huntsville, Alabama. (https://digital.library.unt.edu/ark:/67531/metadc783458/: accessed February 14, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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