A three-equation model has been applied to the prediction of separation-induced transition in high-lift low-Reynolds-number cascade flows. Classical turbulence models fail to predict accurately laminar separation and turbulent reattachment, and usually overpredict the separation length, the main reason for this being the slow rise of the turbulent kinetic energy in the early stage of the separation process. The proposed approach is based on solving an additional transport equation for the so-called laminar kinetic energy, which allows the increase in the nonturbulent fluctuations in the pretransitional and transitional region to be taken into account. The model is derived from that of Lardeau et al. (2004, “Modelling Bypass Transition With Low-Reynolds-Number Non-Linear Eddy-Viscosity Closure,” Flow, Turbul. Combust., 73, pp. 49–76), which was originally formulated to predict bypass transition for attached flows, subject to a wide range of freestream turbulence intensity. A new production term is proposed, based on the mean shear and a laminar eddy-viscosity concept. After a validation of the model for a flat-plate boundary layer, subjected to an adverse pressure gradient, the T106 and T2 cascades, recently tested at the von Kármán Institute, are selected as test cases to assess the ability of the model to predict the flow around high-lift cascades in conditions representative of those in low-pressure turbines. Good agreement with experimental data, in terms of blade-load distributions, separation onset, reattachment locations, and losses, is found over a wide range of Reynolds-number values.
Skip Nav Destination
e-mail: roberto.pacciani@.unifi.it
Article navigation
July 2011
Research Papers
Calculation of High-Lift Cascades in Low Pressure Turbine Conditions Using a Three-Equation Model
Roberto Pacciani,
Roberto Pacciani
Department of Energy Engineering “Sergio Stecco”,
e-mail: roberto.pacciani@.unifi.it
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Search for other works by this author on:
Michele Marconcini,
Michele Marconcini
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Search for other works by this author on:
Atabak Fadai-Ghotbi,
Atabak Fadai-Ghotbi
Imperial College London
, Prince Consort Road, London SW7 2AZ, UK
Search for other works by this author on:
Sylvain Lardeau,
Sylvain Lardeau
Imperial College London
, Prince Consort Road, London SW7 2AZ, UK
Search for other works by this author on:
Michael A. Leschziner
Michael A. Leschziner
Imperial College London
, Prince Consort Road, London SW7 2AZ, UK
Search for other works by this author on:
Roberto Pacciani
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italye-mail: roberto.pacciani@.unifi.it
Michele Marconcini
Department of Energy Engineering “Sergio Stecco”,
University of Florence
, via di Santa Marta, 3, 50139 Firenze, Italy
Atabak Fadai-Ghotbi
Imperial College London
, Prince Consort Road, London SW7 2AZ, UK
Sylvain Lardeau
Imperial College London
, Prince Consort Road, London SW7 2AZ, UK
Michael A. Leschziner
Imperial College London
, Prince Consort Road, London SW7 2AZ, UKJ. Turbomach. Jul 2011, 133(3): 031016 (9 pages)
Published Online: November 18, 2010
Article history
Received:
September 3, 2009
Revised:
September 18, 2009
Online:
November 18, 2010
Published:
November 18, 2010
Citation
Pacciani, R., Marconcini, M., Fadai-Ghotbi, A., Lardeau, S., and Leschziner, M. A. (November 18, 2010). "Calculation of High-Lift Cascades in Low Pressure Turbine Conditions Using a Three-Equation Model." ASME. J. Turbomach. July 2011; 133(3): 031016. https://doi.org/10.1115/1.4001237
Download citation file:
Get Email Alerts
Evaluating Thin-Film Thermocouple Performance on Additively Manufactured Turbine Airfoils
J. Turbomach (July 2025)
Thermohydraulic Performance and Flow Structures of Diamond Pyramid Arrays
J. Turbomach (July 2025)
Related Articles
Predicting the Profile Loss of High-Lift Low Pressure Turbines
J. Turbomach (March,2012)
Combined Effects of Surface Trips and Unsteady Wakes on the Boundary Layer Development of an Ultra-High-Lift LP Turbine Blade
J. Turbomach (July,2005)
Effect of the Leakage Flows and the Upstream Platform Geometry on the Endwall Flows of a Turbine Cascade
J. Turbomach (January,2009)
Separation Control on a Very High Lift Low Pressure Turbine Airfoil Using Pulsed Vortex Generator Jets
J. Turbomach (October,2011)
Related Proceedings Papers
Related Chapters
Boundary Layer Analysis
Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Introduction
Design and Analysis of Centrifugal Compressors