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research-article

Consequences of Borescope Blending Repairs on Modern HPC Blisk Aeroelasticity

[+] Author and Article Information
Benjamin Hanschke

Chair of Structural Mechanics and Vehicle Vibration Technology, Brandenburg University of Technology Cottbus-Senftenberg, D-03046 Cottbus, Germany
benjamin.hanschke@b-tu.de

Arnold Kühhorn

Chair of Structural Mechanics and Vehicle Vibration Technology, Brandenburg University of Technology Cottbus-Senftenberg, D-03046 Cottbus, Germany
kuehhorn@b-tu.de

Sven Schrape

Rolls-Royce Deutschland Ltd & Co KG, D-15827 Blankenfelde-Mahlow, Germany
Sven.Schrape@Rolls-Royce.com

Thomas Giersch

Rolls-Royce Deutschland Ltd & Co KG, D-15827 Blankenfelde-Mahlow, Germany
thomas.giersch@rolls-royce.com

1Corresponding author.

ASME doi:10.1115/1.4041672 History: Received February 14, 2018; Revised September 21, 2018

Abstract

Objective of this paper is to analyse the consequences of borescope blending repairs on the aeroelastic behaviour of a modern HPC blisk. To investigate the blending consequences in terms of aerodynamic damping and forcing changes, an exemplary blending of a rotor blade is modelled. Steady state flow parameters like total pressure ratio, polytropic efficiency and the loss coefficient are compared. Furthermore, aerodynamic damping is computed utilising the AIC approach for both geometries. Results are confirmed by SPF simulations for specific nodal diameters of interest. Finally, an unidirectional forced response analysis for the nominal and the blended rotor is conducted to determine the aerodynamic force exciting the blade motion. Fourier transformation of the forcing signal yields to the frequency content as well as the forcing amplitudes. As a result of the present analysis, the amplification of expected blade vibration amplitude is computed.

Rolls-Royce plc
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