Use of computer technology in modernization of head covers for hydraulic turbines of PL20-V-500 type

Authors

E. A. Strelnikova, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky str., Kharkiv, 61046, Ukraine), ORCID: 0000-0003-0707-7214
T. F. Medvedovskaya, LLC “Kharkivturboengineering” (1, Academic Proskury str., Kharkiv, 61070, Ukraine)
E. L. Medvedeva, LLC “Kharkivturboengineering” (1, Academic Proskury str., Kharkiv, 61070, Ukraine), e-mail: khte@online.kharkov.ua
A. V. Linnik, Joint-Stock Company Turboatom (199, Moskovsky ave., Kharkiv, 61037, Ukraine), e-mail: lynnyk@turboatom.com.ua
O. N. Zelenskaya, Joint-Stock Company Turboatom (199, Moskovsky ave., Kharkiv, 61037, Ukraine)

Abstract

One of the problems faced by a designer in the modernization of operating generating units is the analysis of the feasibility of ensuring the strength and reliability of turbine parts and components in their further continuous operation under dynamic load or replacement of the turbine parts and components which would by optimal in terms of weight and dynamic behavior. It is possible to solve the above problem using computer technologies for dynamic study of load bearing structures of hydraulic turbines in various operating modes. This paper describes techniques developed to study the dynamic mode of deformation of hydraulic turbine head cover taking up the hydrodynamic pressure acting on its surface in contact with water and the weights of parts and components located on its surface. For the first time, the influence of added water masses of the structure is three-dimensionally considered using mathematical models based on hypersingular equations and combination of the finite element method and boundary element method. Application program packages are developed which are a powerful tool of automation in the determination of dynamic mode of deformation of the hydraulic turbine head cover. Numerical results are obtained allowing the evaluation of the dynamic mode of deformation taking into consideration the effect of water on the cast iron head cover of hydraulic turbine ПЛ 20-В-500 in operation and subject to replacement as well as that on the welded steel head cover developed to replace the cast iron one. The numerical study is analyzed and recommendations are given for designing of the welded head cover which dynamical behavior allows preventing resonance phenomena and ensuring the operating reliability. The techniques used are validated by the regulatory document ‘Residual life prediction for water passage components of hydraulic turbines of HPPs and PSPs – Methodical Guidelines’ SOU-N MEV 40.1–21677681–51: 2011.

Keywords: cover; hydraulic turbine; modernization; finite element method; boundary element method; dynamic mode of deformation

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References

1. Kantor B., Strelnikova O., Medvedovska T., Rzhevska I., Yeseleva O., Lynnyk O., Zelenska O. (2011). Calculation of the Residual Resource of the Elements of the Flowing Section of HPS and HPSPP Hydro-Turbines. Methodological guidelines: normative document. SOU-N MEV 40.1 -21677681-51: approved by the Ministry of Energy and Coal Mining of Ukraine: effective as of 07.07.11. Kyiv: Ministry of Energy and Coal Mining of Ukraine (in Ukrainian).
2. Eigenson, S. N., Titov, V. B. (1978). Experimental Study of the Stressed State of Ribs of Hydro-turbine Head Covers by the Polarization-Optical Method. Power-plant , No 11, pp. 11–14 (in Russian).
3. Veremeienko, , Zelenska, O. (1999). Estimation of the Residual Resource of the Head Covers of Hydro-Turbines. Eng. Sci., No 12, pp. 3–8 (in Ukrainian).
4. Veremeenko, , Zelenskaya, O., Linnik, A. (2000, September).Finite-element Analysis of Strength and Dynamic Characteristics of Large-Sized Supporting Structures of Hydraulic Turbines. Perfection of Turbo-Units by Methods of Mathematical and Physical Modeling: Tr. Intern. Scientific-Techn. Conf. (pp. 502–508), Kharkov (in Russian).
5. Medvedovskaya, T., Strelnikova, E., & Medvedyeva, K. (2015). Free Hydroelastic Vibrations of Hydroturbine Head Covers. International Journal of Engineering and Advanced Research Technology (IJEART), vol. 1, iss. 1, pp. 45–50. https://doi.org/10.13140/RG.2.1.3527.4961
6. Degtyarev, K., Glushich, P., Gnitko, V., & Strelnikova, E. A. (2015). Numerical Simulation of Free Liquid-Induced Vibrations in Elastic Shells. International Journal of Modern Physics and Applications, vol. 1, no. 4, pp. 159-168. https://doi.org/10.13140/RG.2.1.1857.5209
7. Gnitko, V., Naumenko, V., Rozova, L., & Strelnikova, E. (2016). Multi-domain Boundary Element Method for Liquid Sloshing Analysis of Tanks with Baffles. J. Basic and Appl. Research Intern., vol. 17, no. 1, pp. 75–87.
8. Avramov, K. V. & Strelnikova, E. A. (2014). Chaotic Oscillations of Plates During Their Two-Way Interaction with the Flow of a Moving Fluid. Appl. Mech., vol. 50, no. 3, pp. 86–93. https://doi.org/10.1007/s10778-014-0633-y
9. Naumenko, V. V. & Strelnikova, H. A. (2002). Singular Integral Accuracy of Calculations in Two-Dimensional problems. Eng. analysis with boundary elements, vol. 26, iss. 1, pp. 95–98. https://doi.org/10.1016/S0955-7997(01)00041-8
10. Veremeyenko, I. S., Kantor, B. Ya., Medvedovskaya, T. F., Rzhevskaya, I. E., & Andryushchenko, S. A. (2005). Strength, Dynamics of the Bearing Structures and Impellers of Radial-Axial Hydro-Turbines. Aviatsionno-kosmicheskaya tekhnika i tekhnologiya – Aerospace Technic and Technology, no. 9 (25), pp. 97–101 (in Russian).
11. Troshchenko, V. T., Lebedev, A. A, Strizhalo, V. A, Stepanov, G. V, & Krivenyuk, V. V. (2000). Mechanical Behavior of Materials under Various Types of Loading. Kiyev: Logos (in Russian).
12. Birger, I. A., Shorr, V. F., & Iosilevich, G. B. (1979). Strength Design of Machine Components. Reference book. Moscow: Mashinostroyeniye (in Russian).
13. Troshchenko, V. T. & Sosnovsky, L. A. (1987). Fatigue Resistance in Metals and Alloys. Reference book: in 2 parts. Kiyev: Naukova Dumka (in Russian).
14. Medvedovskaya, T. F., Medvedeva, E. L., Linnik, A. V., & Zelenskaya, O. N. (2017). Analysis of the Static and Dynamic Strength of the Head Cover of a Reversible Hydraulic Machine. Promyslova elektroenerhetyka ta elektrotekhnika: PROMELEKTRO – Electrical Energy Industry and Electrical Eng., no. 1, pp. 22–26 (in Russian).
15. Bate, K. & Wilson, E. (1982). Numerical Analysis Methods and the Finite Element Method. Moscow: Stroyizdat (in Russian).

Received 20 November 2017

Published 30 March 2018