The most recent correlations for turbine profile losses at off-design incidence include the leading-edge diameter as the only aspect of the leading-edge geometry which influences the losses. Cascade measurements are presented for two turbine blades which differ primarily in their leading-edge geometries. The incidence was varied over a range of ±20 degrees and the results show significant discrepancies between the observed profile losses and those predicted by the available correlations. Using data from the present experiments, as well as cases from the literature for which sufficient geometric data are given, a revised correlation has been developed. The new correlation is a function of both the leading-edge diameter and the wedge angle, and it is significantly more successful than the existing correlations. It is argued that the off-design loss behaviour of the blade is influenced by the magnitude of the discontinuity in curvature at the points where the leading-edge circle meets the rest of the blade profile. The wedge angle appears to be an approximate and convenient measure of the discontinuity in curvature at these blend points.
Skip Nav Destination
ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition
June 5–8, 1995
Houston, Texas, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7878-1
PROCEEDINGS PAPER
Influence of Leading-Edge Geometry on Profile Losses in Turbines at Off-Design Incidence: Experimental Results and an Improved Correlation
M. W. Benner,
M. W. Benner
Carleton University, Ottawa, ON, Canada
Search for other works by this author on:
S. A. Sjolander,
S. A. Sjolander
Carleton University, Ottawa, ON, Canada
Search for other works by this author on:
S. H. Moustapha
S. H. Moustapha
Pratt & Whitney Canada Inc., Longueuil, QC, Canada
Search for other works by this author on:
M. W. Benner
Carleton University, Ottawa, ON, Canada
S. A. Sjolander
Carleton University, Ottawa, ON, Canada
S. H. Moustapha
Pratt & Whitney Canada Inc., Longueuil, QC, Canada
Paper No:
95-GT-289, V001T01A075; 9 pages
Published Online:
February 16, 2015
Citation
Benner, MW, Sjolander, SA, & Moustapha, SH. "Influence of Leading-Edge Geometry on Profile Losses in Turbines at Off-Design Incidence: Experimental Results and an Improved Correlation." Proceedings of the ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. Volume 1: Turbomachinery. Houston, Texas, USA. June 5–8, 1995. V001T01A075. ASME. https://doi.org/10.1115/95-GT-289
Download citation file:
322
Views
Related Proceedings Papers
Related Articles
Influence of Leading-Edge Geometry on Profile Losses in Turbines at Off-Design Incidence: Experimental Results and an Improved Correlation
J. Turbomach (April,1997)
Probabilistic Finite Element Analysis of Cooled High-Pressure Turbine Blades—Part A: Holistic Description of Manufacturing Variability
J. Turbomach (October,2020)
Flow in a Turbine Cascade: Part 1—Losses and Leading-Edge Effects
J. Eng. Gas Turbines Power (April,1984)
Related Chapters
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Hydrodynamic Lubrication
Design of Mechanical Bearings in Cardiac Assist Devices