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Research Papers

Modeling of Rough-Wall Boundary Layer Transition and Heat Transfer on Turbine Airfoils

[+] Author and Article Information
M. Stripf, A. Schulz, H.-J. Bauer

Lehrstuhl und Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (TH), Kaiserstr. 12, 76128 Karlsruhe, Germany

J. Turbomach 130(2), 021003 (Feb 12, 2008) (11 pages) doi:10.1115/1.2750675 History: Received June 27, 2006; Revised July 02, 2006; Published February 12, 2008

A new model for predicting heat transfer in the transitional boundary layer of rough turbine airfoils is presented. The new model makes use of extensive experimental work recently published by the current authors. For the computation of the turbulent boundary layer, a discrete element roughness model is combined with a two-layer model of turbulence. The transition region is modeled using an intermittency equation that blends between the laminar and turbulent boundary layer. Several intermittency functions are evaluated in respect of their applicability to rough-wall transition. To predict the onset of transition, a new correlation is presented, accounting for the influence of freestream turbulence and surface roughness. Finally, the new model is tested against transitional rough-wall boundary layer flows on high-pressure and low-pressure turbine airfoils.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of transition zone models—high-pressure turbine vane test cases, suction side (9)

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Figure 2

Comparison of transition zone models—low-pressure turbine vane test cases, suction side

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Figure 3

Smooth surface transition onset correlations

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Figure 4

Rough surface transition onset (all test cases)

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Figure 5

Rough surface transition onset correlation

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Figure 6

HPTV test cases, influence of roughness density

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Figure 7

Roughness geometry

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Figure 8

HPTV test cases—suction side, influence of roughness height

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Figure 9

Acceleration parameter K on the LPTV suction side

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Figure 10

LPTV test cases—suction side, influence of roughness height

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Figure 11

LPTV test cases, influence of roughness density

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