The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 89-546
Full Name: Dorian Nedelcu
Position: Professor
Age: ON
Sex: Male
Address: "Eftimie Murgu" University of Resita, P-ta Traian Vuia 1-4, RO-320085, Resita
Country: ROMANIA
Tel: 255219134
Tel prefix: 0040
Fax: 0040 219134
E-mail address: d.nedelcu@uem.ro
Other E-mails: ne_dor@yahoo.com
Title of the Paper: Metallographic and numerical methods investigations about failure of a Kaplan turbine runner blade
Authors as they appear in the Paper: Doina Frunzaverde Viorel Câmpian Dorian Nedelcu Gilbert-Rainer Gillich Gabriela Mărginean
Email addresses of all the authors: d.frunzaverde@uem.ro,v.campian@uem.ro,d.nedelcu@uem.ro,gr.gillich@uem.ro,gabriela.marginean@fh-gelsenkirchen.de
Number of paper pages: 10
Abstract: The paper presents the results of the failure analysis of a Kaplan turbine runner blade from a hydropower station in Romania. In order to determine the causes that led to the cracks, the authors first carried out metallographic investigations on a sample obtained from the cracked blade. The metallographic investigations included macroscopic and microscopic examinations (light microscopy and scanning electron microscopy) and X-ray diffraction analyzes (XRD). They led to the conclusion that the cracking of the blade was caused by fatigue, initiated by the numerous non metallic inclusions, which were discovered in the vicinity of the blade surface. The results obtained were confirmed by calculations on the resistance and service life estimations of the blade. The calculations carried out included the following steps: construction of the solid 3D-model of the blade, determination of the blade loads from hydrodynamic conditions, linear static analysis of the blade and s!
ervice life estimations, calculated for maximal stress values of the concentrators. They led to the conclusion that the cracking of the blade started and developed from the stress concentrator placed between blade and blade flange on leading edge direction. In order to decrease the maximal stress value, the authors concluded that the hydrodynamic loads on the blade must be obligatory reduced. Therefore, as the operating conditions (discharge, head, speed, power) are not changeable, the stress reduction could be realized only by increasing the number of the runner blades.
Keywords: Hydropower station, Kaplan turbine, Fatigue cracking, Service life estimations
EXTENSION of the file: .pdf
Special (Invited) Session: Failure Analysis of a Kaplan Turbine Runner Blade by Metallographic and Numerical Methods
Organizer of the Session: 640-539
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