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Title: Damping of flexural vibrations in turbofan blades using the acoustic black hole effect
Authors: Bowyer, E.P.
Krylov, Victor V.
Keywords: Vibration damping
Turbofan blades
Acoustic black hole effect
Issue Date: 2014
Publisher: Elsevier © the authors
Citation: BOWYER, E.P. and KRYLOV, V., 2014. Damping of flexural vibrations in turbofan blades using the acoustic black hole effect. Applied Acoustics, 76, pp.359-365.
Abstract: The results of the experimental study into the damping of flexural vibrations in turbofan blades with trailing edges tapered according to a power-law profile are reported. Trailing edges of power-law profile (wedges), with small pieces of attached absorbing layers, materialise one-dimensional acoustic black holes for flexural waves that can absorb a large proportion of the incident flexural wave energy. The experiments were carried out on four model blades made of aluminium. Two of them were twisted, so that a more realistic fan blade could be considered. All model blades, the ones with tapered trailing edges and the ones of traditional form, were excited by an electromagnetic shaker, and the corresponding frequency response functions have been measured. The results show that the resonant peaks are reduced substantially once a power-law tapering is introduced to the blade. An initial study into the aerodynamic implications of this method has been carried out as well, using measurements in a closed circuit wind tunnel. In particular, the effects of the trailing edge of power-law profile on the airflow-excited vibrations of the fan blades have been investigated. It has been demonstrated that trailing edges of power-law profile with appropriate damping layers are efficient in reduction of the airflow-excited vibrations of the fan blades. The obtained results demonstrate that power-law tapering of trailing edges of turbofan blades can be a viable method of reduction of blade vibrations.
Description: Open Access funded by Engineering and Physical Sciences Research Council
Sponsor: EPSRC Grant EP/F009232/1
Version: Published
DOI: 10.1016/j.apacoust.2013.09.009
URI: https://dspace.lboro.ac.uk/2134/13815
Publisher Link: http://dx.doi.org/10.1016/j.apacoust.2013.09.009
ISSN: 0003-682X
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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