Redesign of High-Lift LP-Turbine Airfoils for Low Speed Testing

TitleRedesign of High-Lift LP-Turbine Airfoils for Low Speed Testing
Publication TypeConference Proceedings
Year of Publication2010
AuthorsMarconcini M, Rubechini F, Pacciani R, Arnone A, Bertini F
Conference NameASME Turbo Expo 2010: Power for Land, Sea, and Air
Volume7: Turbomachinery, Parts A, B, and C
Date Published06/2010
Conference LocationGlasgow, UK, June 14–18, 2010
ISBN Number978-0-7918-4402-1
Accession NumberWOS:000291010300078
Other NumbersScopus 2-s2.0-82055178588

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.


Paper GT2010-23284

Refereed DesignationRefereed