Assessment of flutter instability in simplified blade cascade using CFD based on discontinuous Galerkin method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43950558" target="_blank" >RIV/49777513:23520/17:43950558 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Assessment of flutter instability in simplified blade cascade using CFD based on discontinuous Galerkin method

Popis výsledku v původním jazyce

The central target of the this paper is to present a flutter analysis of the so called simplified blade cascade in a fluid flow. The simplified blade cascade is formed by flat plates instead of real turbine blades. The approach to the flutter analysis is based on travelling wave mode, in which case the flat plates perform a kinematic harmonic motion, each with a different inter-blade phase angle. The aim of the simulations is to determine the aerodynamic damping coefficients caused by the aerodynamic forces acting on the flat plates, which show whether flutter occurs. Another approach to the flutter analysis that involves interaction of flat plates with the fluid flow is presented here. To this end the fluid-structure interaction algorithm is used. The resulting free vibration and natural inter-blade phase angle of the flat plates is analysed. The non-linear system of Favre-averaged Navier-Stokes equations in ALE formulation completed by the Spalart-Allmaras turbulence model was chosen as the mathematical model of a fluid flow. For the modelling of structure movement, the equation for harmonic oscillator was used. The simulations were performed using the developed in-house CFD software based on the discontinuous Galerkin method, which offers high order of accuracy.

Název v anglickém jazyce

Assessment of flutter instability in simplified blade cascade using CFD based on discontinuous Galerkin method

Popis výsledku anglicky

The central target of the this paper is to present a flutter analysis of the so called simplified blade cascade in a fluid flow. The simplified blade cascade is formed by flat plates instead of real turbine blades. The approach to the flutter analysis is based on travelling wave mode, in which case the flat plates perform a kinematic harmonic motion, each with a different inter-blade phase angle. The aim of the simulations is to determine the aerodynamic damping coefficients caused by the aerodynamic forces acting on the flat plates, which show whether flutter occurs. Another approach to the flutter analysis that involves interaction of flat plates with the fluid flow is presented here. To this end the fluid-structure interaction algorithm is used. The resulting free vibration and natural inter-blade phase angle of the flat plates is analysed. The non-linear system of Favre-averaged Navier-Stokes equations in ALE formulation completed by the Spalart-Allmaras turbulence model was chosen as the mathematical model of a fluid flow. For the modelling of structure movement, the equation for harmonic oscillator was used. The simulations were performed using the developed in-house CFD software based on the discontinuous Galerkin method, which offers high order of accuracy.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GA16-04546S" target="_blank" >GA16-04546S: Aeroelastické vazby a dynamické chování rotačně periodických těles</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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