Naslov
Modelling of Non-stationary Thermal Stresses in Steam Turbine Rotor

Autori
Guzović, Zvonimir ; Matijašević, Branimir ; Sviderek, Stanislav ;

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 8th International Research/Expert Conference &#8221 ; Trends in the Development of Machinery and Associated Technology&#8221 ; - 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, 2004, 779-782

Skup
8th International Research/Expert Conference &#8221 ; Trends in the Development of Machinery and Associated Technology&#8221 ; - TMT 2004

Mjesto i datum
Neum, Bosna i Hercegovina, 15.09.2004. - 19.09.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Steam Turbine; Non-stationary Thermal Stresses; Numerical Modelling

Sažetak
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 &sup2 ; ventilation&sup2 ; . 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.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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