Numerical analysis of the modal properties of a shrouded turbine blading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F16%3A43928742" target="_blank" >RIV/49777513:23520/16:43928742 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Numerical analysis of the modal properties of a shrouded turbine blading

Popis výsledku v původním jazyce

Presented work is concerned with the numerical analysis of natural frequencies and corresponding mode shapes of twisted blades with contacts between blade shrouds. The blades are modelled by means of the Finite Element Method (FEM) using Rayleigh beam elements with varying cross-sectional parameters along the elements and six degrees of freedom (DOFs) in each of nodes, while the rhomboid-shaped shrouds are considered to be rigid. The blades are clamped into a rotating rigid disk. Since the finite element models based on the Rayleigh beam theory tend to slightly overrate natural frequencies and underrate deflections in comparison with finite element models including shear deformation effects, parameter tuning of the blades is performed. The modelling of interactions at the contact surfaces of neighbouring blade shrouds is carried out using a multipoint frictionless contact approach with constant normal contact stiffness. In order to compare the natural frequencies, three different geometries of the blade shroud as well as three different values of the pre-twist angle induced by preloads at the contact interfaces are tested.

Název v anglickém jazyce

Numerical analysis of the modal properties of a shrouded turbine blading

Popis výsledku anglicky

Presented work is concerned with the numerical analysis of natural frequencies and corresponding mode shapes of twisted blades with contacts between blade shrouds. The blades are modelled by means of the Finite Element Method (FEM) using Rayleigh beam elements with varying cross-sectional parameters along the elements and six degrees of freedom (DOFs) in each of nodes, while the rhomboid-shaped shrouds are considered to be rigid. The blades are clamped into a rotating rigid disk. Since the finite element models based on the Rayleigh beam theory tend to slightly overrate natural frequencies and underrate deflections in comparison with finite element models including shear deformation effects, parameter tuning of the blades is performed. The modelling of interactions at the contact surfaces of neighbouring blade shrouds is carried out using a multipoint frictionless contact approach with constant normal contact stiffness. In order to compare the natural frequencies, three different geometries of the blade shroud as well as three different values of the pre-twist angle induced by preloads at the contact interfaces are tested.

Druh

D - Stať ve sborníku

CEP obor

JR - Ostatní strojírenství

OECD FORD obor

—

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

Engineering Mechanics 2016, Book of Full Texts

ISBN

978-80-87012-59-8

ISSN

1805-8248

e-ISSN

—

Počet stran výsledku

4

Strana od-do

94-97

Název nakladatele

Institute of Thermomechanics AS CR

Místo vydání

Prague

Místo konání akce

Svratka, Česká republika

Datum konání akce

9. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000379986700020