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Modelling the Streamline Curvature Effects in Turbomachinery Flows

Kozulovic, Dragan and Röber, Thomas (2006) Modelling the Streamline Curvature Effects in Turbomachinery Flows. In: ASME-Paper. ASME Turbo Expo 2006, 2006-05-08, Barcelona, Spain.

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Abstract

Turbomachinery flows show significant streamline curvature with corresponding effects on turbulence development. Generally, linear eddy viscosity turbulence models, which are widely used in industrial aerodynamic design, do not predict these effects accurately, leading to less reliable RANS-simulations. In this work, therefore, a modification is made to the two-equation turbulence model of Wilcox. Although this extension is a simple and pragmatic approach, the effects of streamline curvature are accurately reproduced for many presented applications, ranging from simple generic test cases to multistage compressor flows. Improved predictions of performance maps are achieved, which is mainly due to improved modelling in regions with higher streamline curvature, e.g. tip vortex and end-wall boundary layers. The curvature correction enables a greater mass flow range to be simulated and increases the numerical stability. Furthermore, the new approach requires only local variables, which makes it applicable to complex flows and easy to implement in existing codes.

Document Type:Conference or Workshop Item (Paper)
Additional Information:Paper No. GT2006-90265
Title:Modelling the Streamline Curvature Effects in Turbomachinery Flows
Authors:
AuthorsInstitution or Email of Authors
Kozulovic, DraganUNSPECIFIED
Röber, ThomasUNSPECIFIED
Date:8 May 2006
Journal or Publication Title:ASME-Paper
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:turbomachinery, turbulence modelling, streamline curvature
Event Title:ASME Turbo Expo 2006
Event Location:Barcelona, Spain
Event Type:international Conference
Event Dates:2006-05-08
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Dragan Kozulovic
Deposited On:27 Nov 2006
Last Modified:27 Apr 2009 13:15

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