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A New Alternative for Reduction of Secondary Flows in Low Pressure Turbines

[+] Author Affiliations
Diego Torre, Raúl Vázquez

Industria de Turbopropulsores S.A., Madrid, Spain

Elena de la Rosa Blanco, Howard P. Hodson

Cambridge University, Cambridge, UK

Paper No. GT2006-91002, pp. 883-892; 10 pages
doi:10.1115/GT2006-91002
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 6: Turbomachinery, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4241-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

This paper describes a new flow mechanism for the reduction of secondary flows in Low Pressure Turbines using the benefit of contoured endwalls. The extensive application of contoured endwalls in recent years has provided a deeper understanding of the physical phenomenon that governs the reduction of secondary flows. Based on this understanding, the endwall geometry of a linear cascade of solid-thin profiles typical of Low Pressure Turbines has been redesigned. Experimental data are presented for the validation of this new solution. Based on these data, a reduction of 72% in the SKEH and 20% in the mixed-out endwall losses can be obtained. CFD simulations are also presented to illustrate the effect of the new endwall on the secondary flows. Furthermore, an explanation of the flow mechanism that governs the reduction of the SKEH and the losses is given.

Copyright © 2006 by ASME

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