The effect of the array configuration of circular pin fins is investigated from a numerical and experimental point of view reproducing a typical cooling scheme of a real high pressure aero-engine blade. The airstream enters the domain of interest radially from the hub inlet and exits axially from the trailing edge (TE) outlet section. More than 100 turbulators are inserted in the wedge-shaped TE duct to enhance the heat transfer: A reference array implementing seven rows of staggered pins is compared with an innovative pentagonal arrangement. Investigations were made considering real engine flow conditions: Both numerical calculations and experimental measurements were performed fixing and in the TE throat section. The effect of the tip mass flow rate was also taken into account, investigating 0% and 25% of the TE mass flow rate. The experimental activity was aimed at obtaining detailed heat transfer coefficient maps over the internal pressure side (PS) surface by means of the transient technique with thermochromic liquid crystals. Particle image velocimetry measurements were performed and surface flow visualizations were made by means of the oil and dye technique on the PS surface. Steady-state Reynolds averaged Navier–Stokes simulations were performed with two different computational fluid dynamics (CFD) codes: the commercial software Ansys CFX®11.0 and an in-house solver based on the opensource toolbox OpenFOAM®, to compare the performance and predictive capabilities. Turbulence was modeled by means of the shear stress transport (SST) model with a hybrid near-wall treatment allowing strong clustering of the wall of interest as well as quite coarse refinement on the other viscous surfaces.
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e-mail: cosimo.bianchini@htc.de.unifi.it
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March 2012
Research Papers
Numerical and Experimental Investigation of Turning Flow Effects on Innovative Pin Fin Arrangements for Trailing Edge Cooling Configurations
C. Bianchini,
C. Bianchini
Department of Energy Engineering “Sergio Stecco”,
e-mail: cosimo.bianchini@htc.de.unifi.it
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
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B. Facchini,
B. Facchini
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
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F. Simonetti,
F. Simonetti
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
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L. Tarchi,
L. Tarchi
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
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S. Zecchi
S. Zecchi
Avio Group
, Via I Maggio 56, 10040 Rivalta di Torino, Italy
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C. Bianchini
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italye-mail: cosimo.bianchini@htc.de.unifi.it
B. Facchini
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
F. Simonetti
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
L. Tarchi
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, Via di Santa Marta 3, 50139 Firenze, Italy
S. Zecchi
Avio Group
, Via I Maggio 56, 10040 Rivalta di Torino, ItalyJ. Turbomach. Mar 2012, 134(2): 021005 (8 pages)
Published Online: June 22, 2011
Article history
Received:
September 1, 2010
Revised:
September 21, 2010
Online:
June 22, 2011
Published:
June 22, 2011
Citation
Bianchini, C., Facchini, B., Simonetti, F., Tarchi, L., and Zecchi, S. (June 22, 2011). "Numerical and Experimental Investigation of Turning Flow Effects on Innovative Pin Fin Arrangements for Trailing Edge Cooling Configurations." ASME. J. Turbomach. March 2012; 134(2): 021005. https://doi.org/10.1115/1.4003230
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