High and low frequency excitations of the last stage rotor blades and shaft of the steam turbine 13K215

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

Abstrakty

EN

A three-dimensional numerical analysis for aerodynamic unsteady forces of the last stage steam turbine 13K215 rotor blades and total unsteady forces acting on the shaft from considered stage, have been presented. The numerical calculations were performed for different pressure distribution behind the rotor blades in circumferential direction (p2=6000, 7500, 9000, 7500 Pa). The analysis of the 3D transonic flow of an ideal gas through turbomachinery blade rows moving relatively one to another without takong into account the blades oscillations is presented. An ideal gas flow through the mutually moving stator and rotor blades with periodicity on the whole annulus is describrd by the unsteady Euler conservation equations, which are integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and moving hybrid H-H grid. The algorithm proposed allows to calculate turbine stages with an arbitrary pitch ration of stator and rotor blades. The unsteady forces acting on the rotor blades in axial, tangential and radial directions were found. Due to non-uniform pressure distribution the low frequency excitation appeared. Values of the low frequency excitations are greater than the high frequency excitation caused by the stator blades. Next, the total unsteady forces acting on the shaft from all rotor blades in considered stage were calculated. Values of unsteady forces are very small in comparison to the single blade. The low frequency excitation disappeared. The high frequency excitation is depended on the number of rotor blades.

Słowa kluczowe

EN

unsteady forces; steam turbine; blades; shaft

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2003
• Tom: nr 114
• Strony: 123--132
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Rządkowski R.

• Institute of Fluid Flow Machinery Polish Academy Sciences, ul. Fiszera 14, 80-952 Gdańsk, Poland
• Polish Naval Academy, Śmidowicza 71, 81-919 Gdynia, Poland

autor

Gnesin V.

• Dept. of Aerohydromechanics, Insttitute for Problems in Machinery Ukrainian National Academy of Sciences 2/10 Pozharsky st., Kharkov 310046, Ukraine

autor

Soliński M.

• Institute of Fluid Flow Machinery Polish Academy Sciences, ul. Fiszera 14, 80-952 Gdańsk, Poland

Bibliografia

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