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TECHNICAL PAPERS

Reduction of Secondary Flow Losses in Turbine Cascades by Leading Edge Modifications at the Endwall

[+] Author and Article Information
H. Sauer, R. Müller, K. Vogeler

Dresden University of Technology, 01062 Dresden, Germany

J. Turbomach 123(2), 207-213 (Feb 01, 2000) (7 pages) doi:10.1115/1.1354142 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Sauer, H., and Wolf, H., 1997, “Influencing the Secondary Flow in Turbine Cascades by the Modification of the Blade Leading Edge,” 2, European Conference on Turbomachinery, Antwerpen.
NUMECA International, 1997, “Manual FINE/TURBO™, IGG, Euranus, CFView,” Brussels.
Sauer, H., and Wolf, H., 1993, “The Influence of the Inlet Boundary Layers on the Secondary Losses of Turbine Stages,” AGARD-Conference Proceedings, 537, Montreal, Canada, Oct.
Römer, N., 1990, “Untersuchungen zum Umschlagverhalten der Profilgrenzschicht an Verdichter- und Turbinengittern,” Dissertation Univ. d. Bundeswehr München.
Weiβ, P. A., 1993, “Der Einfluss der Profilgeometrie auf die Entwicklung der Sekundärströmungen in Turbinengittern,” Dissertation Univ. d. Bundeswehr München.
Raab, I., Duden, A., and Fottner, L., 1998, “Controlling the Secondary Flow in a Turbine Cascade by 3D Airfoil Design and Endwall Contouring,” ASME Paper No. 98-GT-72.
Hildebrandt, T., 1997, Weiterentwicklung von 3D Navier-Stokes-Strömungsrechenverfahran zur Anwendung in hochbelasteten Verdichter- und Turbinengittern, Dissertation Univ. d. Bundeswehr München.
Mobarak, A., 1989, “Study of Various Factors Affecting Secondary Loss Vortices Downstream a Straight Turbine Cascade,” ASME Paper No. 89-GT-12.
Gotthardt, H., 1983, “Theoretische und experimentelle Untersuchungen an ebenen Turbinengittern mit Pfeilung und V-Stellung,” Dissertation TU Braunschweig.

Figures

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Secondary flow vortices
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(a) T106 Cascade data (equal blading for each modification) and (b) T106 profile and the modification (leading edge endwall bulb)
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Increase of the integral endwall loss coefficient downstream of a turbine cascade
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Spanwise endwall loss distribution/averaged pitch wise
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Local endwall loss distribution/measuring plane behind T106 and T106/3 at s2/lp=1
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Streamwise vorticity downstream of T106 and T106/3
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Net endwall losses for various bulb geometries
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Averaged exit flow angles vs. span/exp. and analytical results
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Numerical domain and mesh geometry for T106 (coarsened)
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Mesh geometry for T106/3 at the leading edge endwall

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