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Supression of classical flutter ocsillations in bladed wheel using inner damping effect

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F20%3A00535110" target="_blank" >RIV/61388998:_____/20:00535110 - isvavai.cz</a>

  • Result on the web

    <a href="https://www.easdprocedia.org/conferences/easd-conferences/eurodyn-2020/9031" target="_blank" >https://www.easdprocedia.org/conferences/easd-conferences/eurodyn-2020/9031</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.47964/1120.9031.20212" target="_blank" >10.47964/1120.9031.20212</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Supression of classical flutter ocsillations in bladed wheel using inner damping effect

  • Original language description

    Inner material damping effect for reduction of self-excited vibrations due to aeroelastic instability is studied on a numerical reduced model of a rotating turbine wheel with 66 blades. The aerodynamic nozzle excitation of the rotating wheel arises from the spatially periodical flow of steam through the stator blade cascade. This excitation causes travelling deformation waves in the wheel. The analysis of forced vibration of the wheel under selfexcitation is oriented on the narrow frequency range and therefore the bladed wheel is modelled by a modal synthesis method. The self-excited aero-elastic forces are described by Van der Pol model acting herein independently to the 1th axial flexural mode of each blade of the wheel. Numerical simulations showed a very fast entry of amplitudes increase due to selfexcitation.nThe initial forced vibration mode by nozzle excitation was decisive for the vibration pattern of self-excitation. Its suppression depended on the ratio between the intensity factor of self-excitation and the size of proportional damping describing the inner damping.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    20302 - Applied mechanics

Result continuities

  • Project

    <a href="/en/project/GC19-02288J" target="_blank" >GC19-02288J: Robust reduced-order modeling of fluid-structure interaction problems</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2020

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    EURODYN 2020

  • ISBN

    978-618-85072-0-3

  • ISSN

  • e-ISSN

  • Number of pages

    10

  • Pages from-to

    402-411

  • Publisher name

    National Technical University of Athens (NTUA)

  • Place of publication

    Athens

  • Event location

    Athény

  • Event date

    Nov 23, 2020

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article