Naslov
FATIGUE DAMAGE AND REPAIR OF THE REVERSIBLE HYDROPOWER FRANCIS TURBINE

Autori
Domazet, Željko ; Krstulović-Opara, Lovre ; Stupalo, Mladen

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, stručni

Izvornik
21st Danubia-Adria Symposium on Experimental Methods in Solid Mechanics / Jecić, Stjepan ; Semenski, Damir - Zagreb : STUDION HRG, 2004, 240-241

Skup
21st Danubia-Adria Symposium on Experimental Methods in Solid Mechanics

Mjesto i datum
Brijuni, Hrvatska, 29.09.2004. - 02.10.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Francisova turbinna; zamor; popravak zavarivanjem
(Francis turbine; Fatigue damage; Welding repair)

Sažetak
The Francis turbine/pump of the reversible hydropower plant represents particular problem in the design, repair and lifetime prediction. Extreme loadings, during the swift from the turbine to the pump regime of exploitation, cause the damage that is not common in the case of the Francis turbines of standard hydropower plans. Repair of such damages requires detection of the fracture propagation scenario, modification of the blade junction geometry, development of welding process strategy and evaluation of the welding process parameters.On the particular engineering problem, i.e. the 14.8 tons turbine characterized by the 155 MW of maximum power, 600 rpm, and flow of 20.5 m3/min, the cause detection, as well as the repair method is described.The numerical simulation enabled the detection of failure scenario, as well as the approval of proposed method for reducing the stress concentration parameters. Evaluation of the welding process parameters for the cast CrNi alloy, together with the thermal treatment of the welded joints are described as well. Strategies, parameters and conclusions that are going to be presented in the paper, are explaining some important aspects of the hydropower technology and repair strategies.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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