Presented below are numerical calculations of the 3D transonic flow of an ideal gas through a steam turbine last stage with the exhaust hood, taking into account blade oscillations. The approach is based on a solution of the coupled aerodynamic-structure problem for 3D flow through a turbine stage in which fluid and dynamic equations are integrated simultaneously. This provides the correct formulation of the coupled problem because the blade oscillations and loads are a part of solution. An ideal gas flow through stator, rotor blades and the exhaust hood is described by unsteady Euler conservation equations, which are integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and a moving hybrid H-H grid. The structure analysis uses the modal approach and 3D finite element model of a rotor blade. The pressure distribution behind the rotor blades were non-uniform on account of the exhaust hood. In the nominal condition a self-excited rotor blade vibration was discovered.
CITATION STYLE
Rzadkowski, R., Gnesin, V., Kolodyazhnaya, L., & Szczepanik, R. (2019). Unsteady rotor blade forces of 3D transonic flow through steam turbine last stage and exhaust hood with vibrating blades. In Lecture Notes in Mechanical Engineering (pp. 523–531). Pleiades journals. https://doi.org/10.1007/978-3-319-95711-1_52
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