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Numerical and Experimental Comparison of Forced Response of Free-Standing and Single-Connected Last Stage Blades

[+] Author Affiliations
Francesco Piraccini, Michael Mossom

General Electric Company, Baden, Switzerland

Tim Rice

General Electric Company, Rugby, UK

Jury Auciello

General Electric Company, Florence, Italy

Alexey Evtushenko

General Electric Company, St Petersburg, Russia

Paper No. GT2017-64653, pp. V07BT35A026; 8 pages
doi:10.1115/GT2017-64653
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5093-0
  • Copyright © 2017 by ASME

abstract

In this paper a comparison is made between numerical forced response simulations and experimental measurements for two popular Steam Turbine Last Stage Blade (LSB) architectures: a free standing LSB and a single-connected LSB with a mid-span wing (also known as a ‘snubber’). These variants share the same aerodynamic design in operation, i.e. they have the same ‘operating’ geometry. The focus of this study is the level of vibration response induced on the blades by resonance with a non-synchronous excitation. This can reduce the maximum condenser pressure safely attainable by a Steam Turbine during low volume flow (LVF) operation.

The study develops a common method to effectively represent the LVF excitation in FEM harmonic analysis for both free standing and single-connected LSB’s. This is valuable to LSB designers during the initial phase of a new development (when an assessment of the LVF capability is required before experimental measurements have been taken). In addition, the method can be used to evaluate the suitability of an existing LSB design to a revised environment, as it is often the case in retrofit applications.

Copyright © 2017 by ASME
Topics: Blades

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