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Blade Resonant Forced Response Excited by Combustor Acoustic Eigenmodes

[+] Author Affiliations
Arrigo Beretta-Müller, Jaroslaw Szwedowicz

Alstom Power, Baden, Switzerland

Paper No. GT2015-42488, pp. V07BT32A011; 8 pages
doi:10.1115/GT2015-42488
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5677-2
  • Copyright © 2015 by Siemens Energy, Inc.

abstract

In accordance with common engineering practice, the main source for forced response and subsequent high cycle fatigue problems in axial turbines is classical rotor-stator interaction. This criterion determines the excitability of a blade row for its relative circumferential motion with respect to upstream and downstream blade rows that generate time dependent pressure fields due to potential and viscous flow phenomena as well as possible shock waves.

This publication focuses on a less common source of blade vibration excitation induced by acoustic eigenmodes of a combustion chamber. The article gives an overview of a historical example where acoustic pulsations had the potential for exciting harmful vibration on the adjacent first rotating turbine blade row.

A 3D acoustic FEM analysis is performed to predict acoustic eigenmodes of the combustion cavity that could potentially excite vibration of the first turbine stage. Acoustic modes in the range of the critical frequencies from the point of view of resonance with structural eigenfrequencies of neighbouring components are identified and compared to engine measurements. The knowledge gained of the critical frequencies allows for mitigation of the excitation sources with Helmholtz dampers. This paper delivers an additional excitability criterion of rotating blades by acoustic pressure fluctuations in the combustor. Turbine blade excitation is currently assessed only by considering the number of burners in the combustor chamber.

Copyright © 2015 by Siemens Energy, Inc.

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