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Experimental Investigation of Aerodynamic Losses of Different Shapes of a Shrouded Blade Tip Section

[+] Author Affiliations
Nirm V. Nirmalan, Jeremy C. Bailey

GE Global Research Center, Niskayuna, NY

Paper No. GT2005-68903, pp. 785-792; 8 pages
doi:10.1115/GT2005-68903
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 3: Turbo Expo 2005, Parts A and B
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4726-8 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

An experimental investigation was conducted to study the effects on aerodynamic losses of different tip shroud shapes of a shrouded turbine blade. Pressures were measured on the airfoil surface near the tip and a plane downstream of the exit plane in a three-airfoil stationary cascade. The instrumented center airfoil and the two slave airfoils modeled the aerodynamic tip section of a blade and have the capability to vary tip clearance. The experiments were run at tip-clearances varying from 0.25% to 1.67% and at an exit Reynolds number of 1.25 × 106 and Mach Number of 0.95. The paper presents the influence of three tip-shroud shapes and five different tip-clearances on the aerodynamic losses.

Copyright © 2005 by ASME
Topics: Blades , Shapes

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