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Experimental Studies of Leading Edge Contouring Influence on Secondary Losses in Transonic Turbines

[+] Author Affiliations
Ranjan Saha, Jens Fridh, Torsten Fransson

Royal Institute of Technology (KTH), Stockholm, Sweden

Boris I. Mamaev

Siemens LLC Energy Oil & Gas Design Department, Moscow, Russia

Mats Annerfeldt

Siemens Industrial Turbomachinery AB, Finspong, Sweden

Paper No. GT2012-68497, pp. 1109-1119; 11 pages
doi:10.1115/GT2012-68497
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 8: Turbomachinery, Parts A, B, and C
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4474-8
  • Copyright © 2012 by ASME

abstract

An experimental study of the hub leading edge contouring using fillets is performed in an annular sector cascade to observe the influence of secondary flows and aerodynamic losses. The investigated vane is a three dimensional gas turbine guide vane (geometrically similar) with a mid-span aspect ratio of 0.46. The measurements are carried out on the leading edge fillet and baseline cases using pneumatic probes. Significant precautions have been taken to increase the accuracy of the measurements. The investigations are performed for a wide range of operating exit Mach numbers from 0.5 to 0.9 at a design inlet flow angle of 90°. Data presented include the loading, fields of total pressures, exit flow angles, radial flow angles, as well as profile and secondary losses. The vane has a small profile loss of approximately 2.5% and secondary loss of about 1.1%. Contour plots of vorticity distributions and velocity vectors indicate there is a small influence of the vortex-structure in endwall regions when the leading edge fillet is used. Compared to the baseline case the loss for the filleted case is lower up to 13% of span and higher from 13% to 20% of the span for a reference condition with Mach no. of 0.9. For the filleted case, there is a small increase of turning up to 15% of the span and then a small decrease up to 35% of the span. Hence, there are no significant influences on the losses and turning for the filleted case. Results lead to the conclusion that one cannot expect a noticeable effect of leading edge contouring on the aerodynamic efficiency for the investigated 1st stage vane of a modern gas turbine.

Copyright © 2012 by ASME

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