Analysis of 3D flutter of long steam turbine blades - harmonic oscillations

• Autorzy: Rządkowski R. , Gnesin V.

Warianty tytułu

PL

Trójwymiarowa analiza drgań typu "flutter" długiej łopatki turbiny parowej - drgania harmoniczne

• Konferencja: Krajowa Konferencja Mechaniki Płynów (XIV ; 18-22.09.2000 ; Arturówek k/Łodzi, Polska)
• Języki publikacji: EN

Abstrakty

EN

This paper presents an integrated non-linear numerical model for aeroelasticity predictions of the long steam turbine blades. The approach is based on the solution of the coupled fluid - structure problem in which the aerodynamic and structural dynamic equations are integrated simultaneously in time, thus providing the correct formulation of a problem. The ideal gas flow around multiple interblade passages (with periodicity on the whole annulus) is described by the unsteady 3D Euler equations in conservative form, which are integrated by using the explicit monotonous second - order accurate Godunov - Kolgan finite - volume scheme and moving grids. In the structure analysis the modal approach is used. The natural frequencies and modal shapes of the blade were calculated by using 3D finite element model. The instability regions for 5 modes shapes were shown for a harmonic oscillation with the assumed interblade phase angle.

Słowa kluczowe

EN

turbine blade; steam turbine; vibration

PL

łopatka turbiny; turbina parowa; drgania

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
• Rocznik: 2000
• Tom: nr 117, vol. 1
• Strony: 239--248
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Rządkowski R.

• Department of Dynamics of Machines, Institute of Fluid Flow Machinery Poland Academy of Sciences J.Fiszera st., 14, Gdansk 80 952 POLAND Polish Naval Academy, Gdynia

autor

Gnesin V.

• Department of Aerohydromechanics, Institute for Problems in Machinery Ukrainian National Academy of Sciences 2/10 Pozharsky st., Kharkov 310046 UKRAINE

Bibliografia

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• [3] He L., 1984, “Integration of 2D Fluid / Structure Coupled Systems for Calculation of Turbomachinery Aerodynamic, Aeroelastic Instabilities”, J. of Computational Fluid Dynamics, vol.3, p.217.
• [4] Moyroud, F., Jacquet - Richardet, G., and Fransson, T., H., 1996, “A Modal Coupling for Fluid and Structure Analysis of turbomachines Flutter Application to a Fan Stage “, ASME Paper 96 - GT - 335, p. 1-19.
• [5] Rządkowski, R., Gnesin, V. and Kovalov, A., 1998, The 2D Flutter of Blade d Disc in an Incompressible Flow, Unsteady Aerodynamics and Aeroelasticity of Turbomachines, proceedings of the 8th International Symposium held in Stockholm. Sweden, Sept. 14-18, 317-334
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• [7] Bendiksen, O., O., 1998, “Nonlinear Blade Vibration and Flutter in Transonic Rotors“, Proc. of ISROMAC - 7, The 7th Intern. Symp. on Transport Phenomena and Dynamics of Rotating Machinery, Feb., 22-26, 1998. Honolulu, Hawaii, USA, p. 664
• [8] Gnesin, V., I., and Kolodyazhnaya, L., V., 1999, “Numerical Modelling of Aeroelastic Behaviour for Oscillating Turbine Blade Row in 3D Transonic Ideal Flow”, Problems in Machinery Engineering, vol. 1, No 2, p. 65-76.
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• [14] Rządkowski, R., 1998, Dynamics of Steam Turbine Blading, Part Two Bladed Discs”, Ossolineum, Wroclaw-Warszawa.