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Damping of flexural vibrations in turbofan blades using the acoustic black hole effect
journal contribution
posted on 2013-12-11, 15:57 authored by E.P. Bowyer, Victor V. KrylovThe 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.
Funding
EPSRC Grant EP/F009232/1
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
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.Publisher
Elsevier © the authorsVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/Publication date
2014Notes
Open Access funded by Engineering and Physical Sciences Research CouncilISSN
0003-682XPublisher version
Language
- en