Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F23%3A00580638" target="_blank" >RIV/61388998:_____/23:00580638 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.pan.pl/dlibra/publication/148250/edition/129597/content" target="_blank" >https://journals.pan.pl/dlibra/publication/148250/edition/129597/content</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.24425/bpasts.2023.148250" target="_blank" >10.24425/bpasts.2023.148250</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping

Popis výsledku v původním jazyce

A new approach to calculations based on the modal synthesis method is proposed for the evaluation of structural and dry-friction damping effects on self-excited vibrations due to aeroelastic instability in bladed turbine wheels. The method described herein is used to study dry-friction damping of self-excited vibration of an industrial turbine wheel with 66 blades. For evaluating damping effects, the blade couplings are applied to this particular turbine wheel. Therefore, neighbouring blades are interconnected by rigid arms that are fixed on one side to one blade and are in frictional contact on their free side with the other blade. Due to relatively normal motions in contacts, the prescribed contact forces vary over time. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. In this paper, we attempt to model flow-induced instabilities with the Van der Pol model linked to relative motion between neighbouring blades. The proposed modal synthesis method as ROM is a computationally efficient solution allowing substantial parametrization. The effect of the angles of contact surfaces on the wheel dynamics and on the level of the self-excitation suppression will be discussed herein.

Název v anglickém jazyce

Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping

Popis výsledku anglicky

A new approach to calculations based on the modal synthesis method is proposed for the evaluation of structural and dry-friction damping effects on self-excited vibrations due to aeroelastic instability in bladed turbine wheels. The method described herein is used to study dry-friction damping of self-excited vibration of an industrial turbine wheel with 66 blades. For evaluating damping effects, the blade couplings are applied to this particular turbine wheel. Therefore, neighbouring blades are interconnected by rigid arms that are fixed on one side to one blade and are in frictional contact on their free side with the other blade. Due to relatively normal motions in contacts, the prescribed contact forces vary over time. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. In this paper, we attempt to model flow-induced instabilities with the Van der Pol model linked to relative motion between neighbouring blades. The proposed modal synthesis method as ROM is a computationally efficient solution allowing substantial parametrization. The effect of the angles of contact surfaces on the wheel dynamics and on the level of the self-excitation suppression will be discussed herein.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GA20-26779S" target="_blank" >GA20-26779S: Výzkum nestabilit dynamického stall flutteru a jejich následků na aplikace turbostrojů pomocí matematických, numerických a experimentálních metod</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Polish Academy of Sciences. Bulletin. Technical Sciences

ISSN

0239-7528

e-ISSN

2300-1917

Svazek periodika

71

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

10

Strana od-do

e148250

Kód UT WoS článku

001135979700003

EID výsledku v databázi Scopus

2-s2.0-85182925642