Modelling of Non-stationary Thermal Stresses in Steam Turbine Rotor (CROSBI ID 504379)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Guzović, Zvonimir ; Matijašević, Branimir ; Sviderek, Stanislav ;
engleski
Modelling of Non-stationary Thermal Stresses in Steam Turbine Rotor
The increasingly extensive usage of steam turbines for ensuring the variable part of electric load is characterised by high manoeuvrability requirements of their operation. These changeable working regimes of steam turbine are connected with significant changes of pressure, temperature and steam flow through its stages. Thus, the gas-dynamic characteristics of particular stages also change. The changes become increasingly observable towards the turbine exit, i.e. at low pressure stages. In cases when the steam flow is below the on-design value, or when there is even no flow at all, additional heating of turbine rotor occurs due to the phenomenon of ² ; ventilation² ; . In these conditions in steam turbine rotors the intense, space and time dependent temperature gradients can occur, which cause high non-stationary thermal stresses, i.e. increased local concentrations of stresses which has a negative effect on the rotor useful life and in the worst case can cause damage to the whole turbine. Therefore, both in elaborating new designs of steam turbines and in their operation, additional attention is dedicated to thermal and state of stress of rotor in off-design (transient) working regimes. At present, the non-stationary temperature stresses (clearly, as well as the state of total stresses) are efficiently calculated by modelling by means of the users' software programs (i.e. software packages), which are based on engineering numerical methods. As example, the paper presents the algorithm and the results of non-stationary thermal stresses modelling in steam turbine rotor stipulated by pressure change on turbine exit.
Steam Turbine; Non-stationary Thermal Stresses; Numerical Modelling
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Podaci o prilogu
779-782-x.
2004.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the 8th International Research/Expert Conference ” ; Trends in the Development of Machinery and Associated Technology” ; - TMT 2004
Ekinović, Sabahudin ; Brdarević, Safet ; Vivancos, Joan Calvet ; Puerta, Ferran Sales
Zenica: Faculty of Mechanical Engineering in Zenica ; Escola Tecnica Superior D'Enginyeria Industrial de Barcelona
Podaci o skupu
8th International Research/Expert Conference ” ; Trends in the Development of Machinery and Associated Technology” ; - TMT 2004
predavanje
15.09.2004-19.09.2004
Neum, Bosna i Hercegovina