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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April 2008
Research Papers
Modeling of Rough-Wall Boundary Layer Transition and Heat Transfer on Turbine Airfoils
M. Stripf,
M. Stripf
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, Germany
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A. Schulz,
A. Schulz
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, Germany
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H.-J. Bauer
H.-J. Bauer
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, Germany
Search for other works by this author on:
M. Stripf
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, Germany
A. Schulz
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, Germany
H.-J. Bauer
Lehrstuhl und Institut für Thermische Strömungsmaschinen,
Universität Karlsruhe (TH)
, Kaiserstr. 12, 76128 Karlsruhe, GermanyJ. Turbomach. Apr 2008, 130(2): 021003 (11 pages)
Published Online: February 12, 2008
Article history
Received:
June 27, 2006
Revised:
July 2, 2006
Published:
February 12, 2008
Citation
Stripf, M., Schulz, A., and Bauer, H. (February 12, 2008). "Modeling of Rough-Wall Boundary Layer Transition and Heat Transfer on Turbine Airfoils." ASME. J. Turbomach. April 2008; 130(2): 021003. https://doi.org/10.1115/1.2750675
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