The Influence of Leading-Edge Geometry on Secondary Losses in a Turbine Cascade at the Design Incidence-Reference-Cited by-同舟云学术

The Influence of Leading-Edge Geometry on Secondary Losses in a Turbine Cascade at the Design Incidence

Published:2004-04-01 Issue:2 Volume:126 Page:277-287
ISSN:0889-504X
Container-title:Journal of Turbomachinery
language:en
Short-container-title:

Author:

Benner M. W.¹,Sjolander S. A.¹,Moustapha S. H.²

Affiliation:

1. Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, ON, Canada

2. Pratt and Whitney Canada, Inc., Longueuil, PQ, Canada

Abstract

The paper presents detailed experimental results of the secondary flows from two large-scale, low-speed linear turbine cascades. The aerofoils for the two cascades were designed for the same inlet and outlet conditions and differ mainly in their leading-edge geometries. Detailed flow field measurements were made upstream and downstream of the cascades using three and seven-hole pressure probes and static pressure distributions were measured on the aerofoil surfaces. All measurements were made exclusively at the design incidence. The results from this experiment suggest that the strength of the passage vortex plays an important role in the downstream flow field and loss behavior. It was concluded that the aerofoil loading distribution has a significant influence on the strength of this vortex. In contrast, the leading-edge geometry appears to have only a minor influence on the secondary flow field, at least for the design incidence.

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/turbomachinery/article-pdf/126/2/277/5941383/277_1.pdf

Reference43 articles.

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2. Benner, M. W., Sjolander, S. A., and Moustapha, S. H., 1997, “Measurements of Secondary Flows in a Turbine Cascade at Off-Design Incidence,” ASME Paper 97-GT-382.

3. Sieverding, C. H. , 1985, “Recent Progress in the Understanding of Basic Aspects of Secondary Flows in Turbine Blade Passages,” ASME J. Turbomach., 107, pp. 249–257.

4. Gregory-Smith, D. G., 1997, “Secondary and Tip-Clearance Flows in Axial Turbines,” VKI LS 1997-01, Von Karman Institute for Fluid Dynamics, Rhode St. Genese, Belgium.

5. Langston, L. S. , 2001, “Secondary Flows in Axial Turbines—A Review,” Ann. N.Y. Acad. Sci. 934, pp. 11–26.

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