Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Choke flutter instability sources tracking with linearized calculations   Purpose :The choke flutter is a fluid-structure interaction that can lead to
the failure of fan or compressor blade in turbojet engines. In Ultra High
Bypass Ratio (UHBR) fan, the choke flutter appears at part speed regimes and at
low or negative incidence when a strong shock-wave chokes the blade to blade
channel. Localization of main excitation sources and the understanding of the
different work exchange mechanisms will help to avoid deficient and dangerous
fan design. Design/methodology/approach :In this paper, an UHBR fan is analyzed
using a time-linearized Reynolds-Averaged Navier-Stokes equation solver to
investigate the choke flutter. The steady state and the imposed vibration
(inter blade phase angle, reduced frequency and mode shape) are selected to be
in choke flutter situation. Superposition principle induced by the
linearization allow to decompose the blade in numerous small subsections to
track the contribution of each local vibration to the global damping. All
simulations have been performed on a 2D blade to blade extraction. Findings
:Result analysis points to a restricted number of excitation sources at the
trailing edge which induce a large part of the work exchange in a limited
region of the airfoil. Main phenomena suspected are the shock-wave motion and
the shock-wave/boundary layer interaction. Originality/value :An original
excitation source tracking methodology allowed by the linearized calculation is
addressed and applied to a UHBR fan test-case.

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The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex