Abstract

This paper presents the partial integrated method which has been employed 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 the blade row 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 structural analysis the modal approach is used. The natural frequencies and modal shapes of the bla,de were calculated by using 3D finite element model. The coupled fluid-structure oscillations were shown for 5 modes shapes separately and with taking into account the interaction of five natural modes,