NDLI: Mode Shape Sensitivity of the High Pressure Turbine Rotor Excitation Due to Upstream Stators

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jo¨cker, Markus Torsten, H. Fransson
Copyright Year	2002
Abstract	The excitability of single rotor blade mode shapes due to the excitations by upstream stators in high-pressure turbine stages is subject of the present work. An evaluation of unsteady aerodynamic analyses of the stator-rotor interaction towards their sensitivity to the rotor blade mode shape is presented and applied. The unsteady aerodynamic analyses were performed at midspan sections with a well validated 2D/Q3D hybrid Euler/Navier Stokes non-linear flow solver (UNSFLO). The mode shape is parametrized by a torsion axis location in the plane of the blade section, which allows the construction of excitability maps as a function of 2D rigid body mode shapes. Excitability itself is derived from a generalized force analysis. The evaluation demonstrates the high sensitivity of excitability to the mode shape, which suggests that only small modifications in mode shape can significantly change the risk of blade mode excitation. It also highlights the central importance of the relative phase of unsteady blade pressure harmonic. Changes in axial gap can significantly modify the excitability and transform highly excited modes to less excited modes and vice versa. The variation of rotational speed (−5% to +10%) did not show remarkable changes in the mode excitability of the investigated rotor.
Sponsorship	International Gas Turbine Institute
Starting Page	1047
Ending Page	1056
Page Count	10
File Format	PDF
ISBN	0791836096
DOI	10.1115/GT2002-30452
e-ISBN	0791836010
Volume Number	Volume 4: Turbo Expo 2002, Parts A and B
Conference Proceedings	ASME Turbo Expo 2002: Power for Land, Sea, and Air
Language	English
Publisher Date	2002-06-03
Publisher Place	Amsterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Design Unsteady flow computation Excitability Mode shape Forced response Stator-rotor interaction High-pressure turbine Mode shapes Stators High pressure (physics) Excitation Rotors Turbines
Content Type	Text
Resource Type	Article

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