Numerical simulation of aeroelastic effects for an airfoil with two degrees of freedom

Title Alternative:Numerická simulace aeroelastických účinků pro profil křídla s druhým stupněm volnosti
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dc.contributor.authorPátý, Marek
dc.contributor.authorHalama, Jan
dc.date.accessioned2019-07-09T08:11:43Z
dc.date.available2019-07-09T08:11:43Z
dc.date.issued2019
dc.description.abstractZvyšování výkonu parních turbín vede k návrhu nízkotlakých stupňů o velkém průměru, vyznačujících se dlouhými a tenkými lopatkami. Interakce pevných těles s prouděním může způsobit vibrace, které mají za následek sníženou životnost stroje kvůli únavě materiálu. Tato práce představuje matematický model interakce pevného tělesa s tekutinou, navržený za účelem zkoumání vibrací způsobených prouděním. Model je zde aplikován na zjednodušený testovací případ osamoceného profilu leteckého křídla. Model proudění je založen na Eulerových rovnicích v Arbitrary Lagrange-Euler formulaci, diskretizovaných metodou konečných objemů. Jeho validace je provedena prostřednictvím srovnání s experimentálními daty a s numerickými výsledky jiných autorů.cs
dc.description.abstractDie Erhöhung der Leistung von Dampfturbinen führt zum Entwurf von Niedrigdruckgraden mit einem großen Durchschnitt. Diese Grade zeichnen sich durch lange und dünne Schaufeln aus. Die Interaktion der Festkörper mit der Strömung kann Vibrationen erzeugen, welche eine kürzere Lebensdauer der Maschine auf Grund von Materialermüdung zur Folge haben. Diese Arbeit stellt ein mathematisches Modell der Interaktion des festen Körpers mit Flüssigkeit vor, welches zum Zweck der Erforschung von durch Strömung verursachten Vibrationen entworfen worden ist. Das Strömungsmodell basiert auf den Eulergleichungen in der Arbitrary Lagrange-Euler-Formulierung, welche durch die Methode der endlichen Inhalte diskretisiert werden. Die Validierung des Strömungsmodells wird mittels Vergleich mit den experimentellen Daten und mit den numerischen Ergebnissen anderer Autoren durchgeführt.de
dc.description.abstractThe pursuit of increased steam turbine power output leads to a design of low pressure stages with large diameters, featuring long and thin blades. The interaction of the structure with flow may induce vibrations, leading to a reduced operational life of the machine due to material fatigue. This work introduces a mathematical model of fluid-structure interaction, intended for the investigation of flow-induced turbine blade vibrations. At present, it is applied to a simplified test case of an isolated airfoil. The flow model is based on 2D Euler equations in Arbitrary Lagrangian-Eulerian formulation, discretized by the Finite Volume Method with a second-order accurate AUSM+-up scheme. The structure is modelled as a solid body with one rotational and one translational degree of freedom. The solution is realized iteratively by a time-marching method with a two-way fluid-structure coupling. In each iteration the airfoil surface pressure is integrated to determine the forces and the torsional moment driving its motion. The position of the airfoil in the next time step is obtained and the flow is resolved on a newly recreated mesh. The results of the present model are validated by comparison with experimental data and with numerical results of other models.en
dc.description.abstractZwiększanie mocy turbin parowych skutkuje projektowaniem stopni niskociśnieniowych o dużej średnicy, charakteryzujących się długimi i cienkimi łopatkami. Interakcja ciał stałych ze strumieniem powietrza (wiatrem) może wywołać drgania, które wpływają na skrócenie okresu wytrzymałości maszyny z powodu zmęczenia materiału. Niniejsze opracowanie przedstawia matematyczny model interakcji ciała stałego z płynem, opracowany w celu badania drgań spowodowanych przepływem powietrza. Model można zastosować do uproszczonego testowania samodzielnego profilu skrzydła samolotu. Model przepływu powietrza bazuje na równaniach Eulera w procedurze Arbritrary Lagrange-Euler (ALE), zdyskretyzowanych metodą objętości skończonych. Jego walidację przeprowadzono w drodze porównania z danymi doświadczalnymi i numerycznymi wynikami innych autorów.pl
dc.formattext
dc.format.extent19 stran
dc.identifier.doi10.15240/tul/004/2019-1-004
dc.identifier.eissn1803-9790
dc.identifier.issn1803-9782
dc.identifier.otherACC_2019_1_04
dc.identifier.urihttps://dspace.tul.cz/handle/15240/152821
dc.language.isoen
dc.licenseCC BY-NC 4.1
dc.publisherTechnická univerzita v Liberci, Česká republikacs
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dc.relation.ispartofACC Journalen
dc.relation.isrefereedtrue
dc.subjectaeroelasticityen
dc.subjectturbineen
dc.subjectairfoilen
dc.subjectvibrationsen
dc.subjectarbitrary lagrange-euleren
dc.subjectfinite volume methoden
dc.titleNumerical simulation of aeroelastic effects for an airfoil with two degrees of freedomen
dc.title.alternativeNumerická simulace aeroelastických účinků pro profil křídla s druhým stupněm volnostics
dc.title.alternativeNumerische Simulation aeroelastischer Wirkungen für das Profil der Tragfläche mit dem zweiten Freiheitsgradde
dc.title.alternativeNumeryczna symulacja aeroelastycznego oddziaływania na profil skrzydła z drugim stopniem swobodypl
dc.typeArticleen
local.accessopen
local.citation.epage57
local.citation.spage39
local.fulltextyesen
local.relation.issue1
local.relation.volume25
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