Turbulence Modeling and Computation of Viscous Transitional Flows for Low Pressure Turbines

[+] Author and Article Information
A. Chernobrovkin, B. Lakshminarayana

Center for Gas Turbines and Power, The Pennsylvania State University, 153 Hammond Building, University Park, PA 16802

J. Fluids Eng 121(4), 824-833 (Dec 01, 1999) (10 pages) doi:10.1115/1.2823543 History: Received December 14, 1998; Revised September 16, 1999; Online December 04, 2007


Variation of the flow Reynolds number between the take off and cruise conditions significantly affects the boundary layer development on low-pressure turbine blading. A decreased Reynolds number leads to the flow separation on the suction surface of the blading and increased losses. A numerical simulation has been carried out to assess the ability of a Navier-Stokes solver to predict transitional flows in a wide range of Reynolds numbers and inlet turbulence intensities. A number of turbulence models (including the Algebraic Reynolds Stress Model) and transition models have been employed to analyze the reliability and accuracy of the numerical simulation. A comparison between the prediction and the experimental data reveals good correlation. However, the analysis shows that the artificial dissipation in the numerical solver may have a profound effect on the prediction of the transition in a separated flow.

Copyright © 1999 by The American Society of Mechanical Engineers
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