THE APPLICATION OF FRACTURE MECHANICS TO PREDICT THE FRANCIS HYDRAULIC TURBINES LIFETIME
https://doi.org/10.30724/1998-9903-2018-20-9-10-71-78
Abstract
To plan for timely reconstruction, modernization, repairs or replacement of equipment it is important to reliably predict the instant of its transition to the limiting state that determines the lifetime. Currently, there are no regulatory methods for assessing the lifetime of hydraulic turbines at the operation stage. The approach presented in this paper uses the fracture mechanics methods to build a long-term individual forecast of the dangerous development defects in the main elements of hydraulic turbines taking into account design, technological and operational features. The forecast is based on three-dimensional mathematical models that describe the change in the technical condition of the equipment during time under actual operation. The ANSYS software is used for calculations. Models take into account the size and position of detected or possible defects. Crack growth is determined by the combination of low- and high-frequency loads. The critical length of the crack corresponds to the instant of change of the crack development mechanism, when the failure risk increases sharply. Proposed approach can significantly reduce the possibility of unplanned or emergency shutdown of the hydraulic unit due to its destruction during the overhaul period.
About the Author
E. V. Georgievskaia
JSC «NPO CKTI», St. Petersburg
Russian Federation
Ph.D. (Physics & Mathematics), Head of the Turbine Strength Test Laboratory for the Thermal, Nuclear and Hydro Power Plants
Russian Federation
Ph.D. (Physics & Mathematics), Head of the Turbine Strength Test Laboratory for the Thermal, Nuclear and Hydro Power Plants
References
1. Georgievskaia E. The lifetime of the hydraulic turbines is the guarantee of reliability and safe operation of HPPs. Analytical review of the literature (Георгиевская Е. Ресурс гидротурбин – гарантия надежности и безопасности эксплуатации ГЭС. Аналитический обзор литературы). LAP Lambert Academic Publishing. 2018. 157 p. ISBN 978-613-6-95791-3 (rus).
2. Liu X., Luo Y., Wang Z. A review on fatigue damage mechanism in hydroturbines // Renewable and Sustainable Energy Reviews 54 (2016), p. 1–14. doi: 10.1016/j.rser.2015.09.025.
3. D. Frunzăverdel, S. Muntean, G. Mărginean, V. Câmpiani, L. Marşavina, R. Terzi, V. Şerban. Failure analysis of a Francis turbine runner // IOP Conf. Series: Earth and Environmental Science. 2010. Vol. 12. P. 012115. doi:10.1088/1755-1315/12/1/012115.
4. Zhou Ye. Technology of monitoring of operating conditions and diagnostics of faults of large hydropower units / / VIII STK " Hydropower. New developments and technologies". Reports and speeches. Saint-Petersburg. Publishing house " VNIIG im. B. E. Vedeneeva". 2015. P. 84-97. (rus).
5. Nennemann B., Monette C., Chamberland-Lauzon J. Hydrodynamic damping and stiffness prediction in Francis turbine runners using CFD // IOP Conf. Series: Earth and Environmental Science. 2016. № 49. P. 072006. doi:10.1088/1755-1315/49/7/072006.
6. Alberto Luna-Ramírez, Alfonso Campos-Amezcua, Oscar Dorantes-Gómez, Zdzislaw Mazur-Czerwiec, Rodolfo Muñoz-Quezada Failure analysis of runner blades in a Francis hydraulic turbine — Case study // Engineering Failure Analysis. 2016. Vol. 59. P. 314-325. doi:10.1016/j.engfailanal.2015.10.020.
7. Zouhar J., Obrovsky J., Feilhauer M., Skotak A. Case Study and Numerical Analysis of Vibration and Runner Cracks for the Lipno I Hydroelectric Project // IOP Conf. Series: Earth and Environmental Science. 2016. Vol. 49. P. 072011. doi:10.1088/1755-1315/49/7/072011.
8. Huang X., Chamberland-Lauzon J., Oram C., Klopfer A., Ruchonnet N. Fatigue analyses of the prototype Francis runners based on site measurements and simulations // IOP Conf. Series: Earth and Environmental Science. 2014. Vol. 22. № 1. Pp. 12014-12021(8). doi:10.1088/1755-1315/22/1/012014.
9. Georgievskaia E.V. The energy approach for assessment of dynamic stresses in hydraulic turbines // St. Petersburg Polytechnic University Journal of Engineering Science and Technology. 2017. № 4. С. 88-97. (rus). doi 10.18721/JEST.230408.
10. Paris P., Erdogan F. A critical analysis of crack propagation laws // Journal of Basic Engineering (Trans. ASME). 1963. No. 12. P. 528-534.
11. Yarema S.Ya. Correlation of the parameters of the Paris equation and the cyclic crack resistance characteristics of materials // Strength of Materials. 1981. V. 13, no. 9. P. 20-28.
12. BS 7910:2005. Guide to methods for assessing the acceptability of flaws in metallic structures.
13. Boukani H. Habibzadeh, Viens M., Tahan S.A., Gagnon M. On the performance of nondestructive testing methods in the hydroelectric turbine industry // IOP Conf. Series: Earth and Environmental Science. 2014. Vol. 22. № 1. Pp. 12018-12025. doi:10.1088/1755-1315/22/1/012018.
14. Trudel A.; Sabourin M. Metallurgical and fatigue assessments of welds in cast welded hydraulic turbine runners // IOP Conf. Series: Earth and Environmental Science. 2014. Vol. 22. № 1. Pp. 12015-12025(11). doi.org/10.1088/1755-1315/22/1/012015.
15. Thibault D., Gagnon M., Godin S. Bridging the gap between metallurgy and fatigue reliability of hydraulic turbine runners // IOP Conference Series: Earth and Environmental Science, Volume 22, Number 1, 2014, pp. 12019-12029(11). doi:10.1088/1755-1315/22/1/012019.
Review
For citations:
Georgievskaia E.V. THE APPLICATION OF FRACTURE MECHANICS TO PREDICT THE FRANCIS HYDRAULIC TURBINES LIFETIME. Power engineering: research, equipment, technology. 2018;20(9-10):71-78. https://doi.org/10.30724/1998-9903-2018-20-9-10-71-78
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