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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GC19-02288J" target="_blank" >GC19-02288J: Robustní metody redukce-řádu modelu pro úlohy interakce poddajných těles s tekutinou</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

EURODYN 2020

ISBN

978-618-85072-0-3

ISSN

—

e-ISSN

—

Počet stran výsledku

10

Strana od-do

402-411

Název nakladatele

National Technical University of Athens (NTUA)

Místo vydání

Athens

Místo konání akce

Athény

Datum konání akce

23. 11. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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