Search for the Optimum Simple Computational Model of the Turbine Bladed Disk

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F18%3AN0000025" target="_blank" >RIV/47718684:_____/18:N0000025 - isvavai.cz</a>

Výsledek na webu

<a href="https://submissions.wccm2018.org/#!/scheduling/searchable" target="_blank" >https://submissions.wccm2018.org/#!/scheduling/searchable</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Search for the Optimum Simple Computational Model of the Turbine Bladed Disk

Popis výsledku v původním jazyce

Motivation for introducing this paper is the topical application of the method using the rotational periodicity of the structure at calculating natural vibration characteristics of the steam turbine bladed disk with continuous binding, in this case in the form of an integral shrouding and in the middle of the blade with the tie-boss connection. Part of the shroud and part of the tie-boss are the integral parts of the blade. Blades are free at non-rotating bladed disk. Blades of the advanced design are continuously coupled in the zone of the shroud and in the tie-boss zone by the blades untwist caused by the centrifugal forces acting at the turbine rotation. The method used for the calculation of natural frequencies and mode shapes rotational periodicity of the structure supposes that the finite periodic system (in this case of the bladed disk with the continuous binding) is composed of the definite number of identical parts – subsystems. The subsystem discretization (in this case using the finite element method) will be performed in such a way that it may be coupled to their left-side and right-side adjacent subsystems in identical number of points in identical degrees of freedom. Mathematically, this approach to the problem formulation leads to assembling and solving the matrix difference equations. This method does not enable to model real contact properties. The contact must be modeled by the flexible connection. Stiffness of the connection in the zones of adjoining blades contact was tuned at turbine operational speed (i.e. at 3000 rpm) in such a way that the values of calculated natural frequencies might come as near as possible to the values of the measured natural frequencies. Calculated value of the first natural frequency associated to mode shape with zero nodal diameter appears to be problematic. It differs from the measured natural frequency associated to mode shape with zero nodal diameter by 30 per cent. The paper deals with searching for the approach to the creation of the model of the steam turbine bladed disk with continuous binding that would improve the compliance of this natural frequency with the measured natural frequency. In: Proceedings of Abstracts of The 13th World Congress on Computational Mechanics WCCM XIII & 2nd Pan American Congress on Computational Mechanics PANACM II, Columbia University, New York (New York, USA), July 2018.

Název v anglickém jazyce

Search for the Optimum Simple Computational Model of the Turbine Bladed Disk

Popis výsledku anglicky

Motivation for introducing this paper is the topical application of the method using the rotational periodicity of the structure at calculating natural vibration characteristics of the steam turbine bladed disk with continuous binding, in this case in the form of an integral shrouding and in the middle of the blade with the tie-boss connection. Part of the shroud and part of the tie-boss are the integral parts of the blade. Blades are free at non-rotating bladed disk. Blades of the advanced design are continuously coupled in the zone of the shroud and in the tie-boss zone by the blades untwist caused by the centrifugal forces acting at the turbine rotation. The method used for the calculation of natural frequencies and mode shapes rotational periodicity of the structure supposes that the finite periodic system (in this case of the bladed disk with the continuous binding) is composed of the definite number of identical parts – subsystems. The subsystem discretization (in this case using the finite element method) will be performed in such a way that it may be coupled to their left-side and right-side adjacent subsystems in identical number of points in identical degrees of freedom. Mathematically, this approach to the problem formulation leads to assembling and solving the matrix difference equations. This method does not enable to model real contact properties. The contact must be modeled by the flexible connection. Stiffness of the connection in the zones of adjoining blades contact was tuned at turbine operational speed (i.e. at 3000 rpm) in such a way that the values of calculated natural frequencies might come as near as possible to the values of the measured natural frequencies. Calculated value of the first natural frequency associated to mode shape with zero nodal diameter appears to be problematic. It differs from the measured natural frequency associated to mode shape with zero nodal diameter by 30 per cent. The paper deals with searching for the approach to the creation of the model of the steam turbine bladed disk with continuous binding that would improve the compliance of this natural frequency with the measured natural frequency. In: Proceedings of Abstracts of The 13th World Congress on Computational Mechanics WCCM XIII & 2nd Pan American Congress on Computational Mechanics PANACM II, Columbia University, New York (New York, USA), July 2018.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TE01020068" target="_blank" >TE01020068: Centrum výzkumu a experimentálního vývoje spolehlivé energetiky</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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