The one equation Spalart Allamaras (SA) turbulence model in an extended modular form is employed for the prediction of cross wind flow around the lip of a 90 degree sector of an intake with and without surface roughness. The flow features around the lip are complex. There exists a region of high streamline curvature. For this the Richardson number would suggest complete degeneration to laminar flow. Also there are regions of high favourable pressure gradient (FPG) sufficient to laminarize a turbulent boundary layer (BL). This is all terminated by a shock and followed by a laminar separation. Under these severe conditions, the SA model is insensitive to capturing the effects of laminarization and the reenergization of eddy viscosity which promotes the momentum transfer and correct reattachment prior to the fan face. Through distinct modules, the SA model has been modified to account for the effect of laminarization and separation induced transition. The SA modules have been implemented in Rolls-Royce HYDRA Computational Fluid Dynamic (CFD) solver. They have been validated over a number of experimental test cases involving laminarization and also surface roughness. The validated modules are finally applied in unsteady RANS mode to flow around an engine intake and comparisons made with measurements. Encouraging agreement is found and hence advances made towards a more reliable intake design framework.
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ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
June 3–7, 2013
San Antonio, Texas, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5523-2
PROCEEDINGS PAPER
Modular Turbulence Modelling Applied to an Engine Intake Available to Purchase
Ugochukwu R. Oriji,
Ugochukwu R. Oriji
University of Cambridge, Cambridge, UK
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Paul G. Tucker
Paul G. Tucker
University of Cambridge, Cambridge, UK
Search for other works by this author on:
Ugochukwu R. Oriji
University of Cambridge, Cambridge, UK
Paul G. Tucker
University of Cambridge, Cambridge, UK
Paper No:
GT2013-94983, V06BT37A025; 11 pages
Published Online:
November 14, 2013
Citation
Oriji, UR, & Tucker, PG. "Modular Turbulence Modelling Applied to an Engine Intake." Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. Volume 6B: Turbomachinery. San Antonio, Texas, USA. June 3–7, 2013. V06BT37A025. ASME. https://doi.org/10.1115/GT2013-94983
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