3D inviscid flutter of IV Standard Configuration. Part II. Coupled fluid-structure oscilstions

• Autorzy: Rządkowski R. , Gnesin V.
• Języki publikacji: EN

Abstrakty

EN

A three-dimensional nonlinear time-marching method and numerical analysis for aerolastic behaviour of oscillating blade of the IV Standard Configuration has been presented. The approach is based on the solution of the coupled fluid-structure problem in which the aerodynamic and structural equations are integrated simultaneously in time. In this formulation of a coupled problem, the interblade phase angle at which stability (or instability) would occur, is a part of the solution. The ideal gas flow through multiple interblade passage (with periodicity on the whole annulus) is described by the unsteady Euler equations in the form of conservative laws, which are integrated by use of the explicit monotonous second order accurate Godunov-Kolgan finite volume scheme and moving hybrid H-H (or H-O) grid. The structure analysis uses the modal approach and 3D finite element model of the blade. The blade motion is assumed to be a linear combination of mode shapes with the modal coefficients depending on time. The influence of the natural frequencies on the aerolastic coupled oscillations for the Fourth Standard Configuration is shown. It has been shown that interaction between modes plays an important role in the aerolastic blade response. This interaction has essentially nonlinear character and leads to blade limit cycle oscillations. The sign of the aerodamping coefficient calculated for the harmonic oscillations, may be considered only as a necessary, but not a sufficient condition for self-exited oscillations.

Słowa kluczowe

EN

flutter; blades; inviscid flow

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2002
• Tom: nr 111
• Strony: 51--71
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Rządkowski R.

autor

Gnesin V.

• Rządkowski, R. - Institute of Fluif-Flow Machinery, Polish of Sciences, Centre for Mechanics of Machines, Gdańsk, Poland Gniesin, V. - Ukrainian National Academy of Sciences, Institute for Problems in Machinery, Department of Aerohydromechanics, Kharkov