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Probabilistic Analysis of Turbine Blade Tolerancing and Tip Shroud Gap

[+] Author Affiliations
P. Jafarali

GE Energy, Bangalore, KA, India

Dmitry Krikunov

GE Energy, Moscow, Russia

Amir Mujezinović, Nicholas A. Tisenchek

GE Energy, Schenectady, NY

Paper No. GT2012-70138, pp. 469-476; 8 pages
doi:10.1115/GT2012-70138
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 7: Structures and Dynamics, Parts A and B
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4473-1
  • Copyright © 2012 by ASME

abstract

This paper consists of two parts. Part I presents a probabilistic based approach to determine an allowable manufacturing tolerance range on a steam turbine blade when the allowable Defects Per Million Opportunity (DPMO) are known a priori. The method allows simulating the entire row of blades with geometrical deviations by using only a few representative blade models. The proposed method takes into account the probabilistic nature of the dimensional variation within the tolerance ranges. Furthermore, the method allows the designer to understand the impact on critical blade design parameters.

Part II of this paper proposes a probabilistic evaluation of gap / interference between shrouds of two adjacent blades of a steam turbine. The method uses manufacturing process capability of the relevant design parameter: tip shroud pitch for the tip shroud gap. This method allows for a probabilistic optimization of the shroud gap between two adjacent blades in order to balance reliability and ease of assembly.

Copyright © 2012 by ASME

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