This paper presents a numerical study of the turbulent flows through a number of 2D and 3D 180 deg -ducts, with and without guide vanes, using the Reynolds-averaged Navier–Stokes method. Computations have been first carried out for a 2D -duct flow with four turbulence models (V2F, , shear stress transport (SST), and Reynolds stress). The models’ capability for predicting streamline curvature effects on turbulence and separation has been assessed, using flow and turbulence data. The effects of adding a guide vane inside the bend have been analyzed to reduce/avoid flow separation. Three vanes with different radial locations have been studied, and the mechanism for pressure loss reduction has been examined. Analyses have been performed for turbulent flows in 3D -ducts with square cross section and sharp 180 deg turning , similar to the -bends in typical turbine blade cooling passages. The predictions are compared with the data of outer-wall pressure. The effects of the guide vane and outer-wall shape on the flow separation, secondary-flow vortices, and pressure loss have been evaluated. The combined vane and uniform cross section area are found to improve the flow distribution and reduce the pressure loss significantly.
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April 2009
Research Papers
Analysis of Turbulent Flow in 180 deg Turning Ducts With and Without Guide Vanes
Jiang Luo,
Jiang Luo
Solar Turbines Incorporated, A Caterpillar Company
, San Diego, CA 92101
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Eli H. Razinsky
Eli H. Razinsky
Solar Turbines Incorporated, A Caterpillar Company
, San Diego, CA 92101
Search for other works by this author on:
Jiang Luo
Solar Turbines Incorporated, A Caterpillar Company
, San Diego, CA 92101
Eli H. Razinsky
Solar Turbines Incorporated, A Caterpillar Company
, San Diego, CA 92101J. Turbomach. Apr 2009, 131(2): 021011 (10 pages)
Published Online: January 29, 2009
Article history
Received:
August 13, 2007
Revised:
May 5, 2008
Published:
January 29, 2009
Citation
Luo, J., and Razinsky, E. H. (January 29, 2009). "Analysis of Turbulent Flow in 180 deg Turning Ducts With and Without Guide Vanes." ASME. J. Turbomach. April 2009; 131(2): 021011. https://doi.org/10.1115/1.2987239
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