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TECHNICAL PAPERS

Application of the Turbulent Potential Model to Heat Transfer Predictions on a Turbine Guide Vane

[+] Author and Article Information
Rene Pecnik

Institute for Thermal Turbomachinery and Machine Dynamics,  Graz University of Technology, Graz 8010, Austriarene@ttm.tu-graz.ac.at

Wolfgang Sanz

Institute for Thermal Turbomachinery and Machine Dynamics,  Graz University of Technology, Graz 8010, Austria

J. Turbomach 129(3), 628-635 (Jul 27, 2006) (8 pages) doi:10.1115/1.2720494 History: Received July 17, 2006; Revised July 27, 2006

The accurate numerical simulation of the flow through turbomachinery depends on the reliable prediction of laminar to turbulent boundary layer transition phenomena. The aim of this paper is to study the ability of the turbulent potential model to predict those nonequilibrium turbulent flows for several test cases. Within this model turbulent quantities are described by the turbulent scalar and turbulent vector potentials of the turbulent body force—the divergence of the Reynolds stress tensor. For model validation first flat plate test cases with different inlet turbulence intensities, zero pressure gradient, and nonuniform pressure gradient distributions along the plate were calculated and compared by means of skin friction values measured in the experiments. Finally the model was validated by heat transfer measurement data obtained from a highly loaded transonic turbine guide vane cascade for different operating conditions.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

FSTI distribution over Rex for the flat plate test case T3A and T3B

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Figure 2

Skin friction coefficient (top) and shape factor (bottom) for the test cases T3A and T3B

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Figure 3

Boundary layer velocity profiles and turbulence quantities at three different plate positions for the test case T3A

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Figure 4

Skin friction coefficient for the test cases T3C1 and T3C2

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Figure 5

Mach number distribution (MUR241) and grid topology of the investigated VKI test case

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Figure 6

Heat transfer for the VKI test case MUR235 (Tui=6.0%)

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Figure 7

Heat transfer for the VKI test case MUR241 (Tui=6.0%)

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Figure 8

Heat transfer for the VKI test case MUR245 (Tui=4.0%)

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Figure 9

Heat transfer for the VKI test case MUR247 (Tui=1.0%)

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