The correct prediction of the aerodynamic wall shear stress is a good test of a numerical codes ability to predict profile loss. Its measurement with heated thin film gauges is significantly easier than attempting a complete measurement of a turbine blade boundary layer. A modified form of previously published heated thin film gauge calibrations allow wall shear stress measurement in laminar incompressible flow with favourable pressure gradients and turbulent incompressible flows with small pressure gradients. In this paper, measurements are presented of the distribution of aerodynamic wall shear stress over the suction surface of a turbine blade in a linear cascade. Gauge voltage signal analyses show a laminar separation bubble between about 53% and 63% of suction surface length that is confirmed by surface flow visualisation. By-pass transition is detected by downstream gauges. Wall shear stress measurements are presented at two cascade incidence angles and for tripped and natural transition. The commercial code FLUENT is used to predict the surface pressure distribution, the aerodynamic wall shear stress distribution in the laminar region and the turbulent surface shear distribution for the tripped boundary layer. Comparisons are made between measurements and predictions.
Skip Nav Destination
ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
June 2–5, 1998
Stockholm, Sweden
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7862-0
PROCEEDINGS PAPER
Turbine Blade Aerodynamic Wall Shear Stress Measurements and Predictions
J. E. Fitzgerald,
J. E. Fitzgerald
University of Limerick, Limerick, Ireland
Search for other works by this author on:
A. J. Niven,
A. J. Niven
University of Limerick, Limerick, Ireland
Search for other works by this author on:
M. R. D. Davies
M. R. D. Davies
University of Limerick, Limerick, Ireland
Search for other works by this author on:
J. E. Fitzgerald
University of Limerick, Limerick, Ireland
A. J. Niven
University of Limerick, Limerick, Ireland
M. R. D. Davies
University of Limerick, Limerick, Ireland
Paper No:
98-GT-562, V001T01A133; 9 pages
Published Online:
December 23, 2014
Citation
Fitzgerald, JE, Niven, AJ, & Davies, MRD. "Turbine Blade Aerodynamic Wall Shear Stress Measurements and Predictions." Proceedings of the ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 1: Turbomachinery. Stockholm, Sweden. June 2–5, 1998. V001T01A133. ASME. https://doi.org/10.1115/98-GT-562
Download citation file:
388
Views
Related Proceedings Papers
Related Articles
Calculation of High-Lift Cascades in Low Pressure Turbine Conditions Using a Three-Equation Model
J. Turbomach (July,2011)
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)
Endwall Losses and Flow Unsteadiness in a Turbine Blade Cascade
J. Turbomach (January,1992)
Related Chapters
Introduction
Design and Analysis of Centrifugal Compressors
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Boundary Layer Analysis
Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis