Low pressure turbine airfoils of the present generation usually operate at subsonic conditions, with exit Mach numbers of about 0.6. To reduce the costs of experimental programs it can be convenient to carry out measurements in low speed tunnels in order to determine the cascades performance. Generally speaking, low speed tests are usually carried out on airfoils with modified shape, in order to compensate for the effects of compressibility. A scaling procedure for high-lift, low pressure turbine airfoils to be studied in low speed conditions is presented and discussed. The proposed procedure is based on the matching of a prescribed blade load distribution between the low speed airfoil and the actual one. Such a requirement is fulfilled via an artificial neural network (ANN) methodology and a detailed parameterization of the airfoil. A RANS solver is used to guide the redesign process. The comparison between high and low speed profiles is carried out, over a wide range of Reynolds numbers, by using a novel three-equation, transition-sensitive, turbulence model. Such a model is based on the coupling of an additional transport equation for the so-called laminar kinetic energy (LKE) with the Wilcox k-ω model and it has proven to be effective for transitional, separated-flow configurations of high-lift cascade flows.
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Redesign of High-Lift Low Pressure Turbine Airfoils for Low Speed Testing
,
Filippo Rubechini
,
Filippo Rubechini
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
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Roberto Pacciani
,
Roberto Pacciani
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
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Andrea Arnone
,
Andrea Arnone
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
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Francesco Bertini
Francesco Bertini
Avio S.p.A.,
via I Maggio, 99, 10040, Rivalta di Torino (TO), Italy
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Filippo Rubechini
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Roberto Pacciani
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Andrea Arnone
“Sergio Stecco” Department of Energy Engineering,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Francesco Bertini
Avio S.p.A.,
via I Maggio, 99, 10040, Rivalta di Torino (TO), Italy
J. Turbomach. Sep 2012, 134(5): 051017 (8 pages)
Published Online: May 11, 2012
Article history
Received:
March 8, 2011
Accepted:
June 17, 2011
Published:
May 10, 2012
Online:
May 11, 2012
Citation
Marconcini, M., Rubechini, F., Pacciani, R., Arnone, A., and Bertini, F. (May 11, 2012). "Redesign of High-Lift Low Pressure Turbine Airfoils for Low Speed Testing." ASME. J. Turbomach. September 2012; 134(5): 051017. https://doi.org/10.1115/1.4004474
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