Theoretical investigation of stresses induced at blade mounting locations in steam turbine rotor system

• Autorzy: Prasad D. K. , Ramana K. V. , Rao N. M.

Identyfikatory

DOI

10.2478-ijame-2019-0019

• Języki publikacji: EN

Abstrakty

EN

One of the most common incipient losses of integrity in mechanical structures is the development and propagation of cracks. Especially in rotating members like steam turbine rotors etc. cracks, because of their potential, cause catastrophic failures and are a grave threat to an uninterrupted operation and performance. A crack may propagate from some small imperfections on the surface of the body or inside of the material and it is most likely to appear in correspondence to high stress concentration. Crack propagation path is generally determined by the direction of maximum stress or by the minimum material strength. Hence determination of stresses induced has been the focus of attention for many researchers. In the present work, development of a mathematical model to determine the stresses induced in a rotating disc of varying thickness is studied. This model is applied to a steam turbine rotor disc to determine the induced stresses and radial deflection. The mathematical modeling results are validated with the results obtained using Ansys package. The results of the present study will be useful in diagnosing the location and magnitude of maximum stress induced in the turbine rotor disc and stress intensity factor due to the presence of crack.

Słowa kluczowe

EN

rotor disc; radial stress; tangential stress; steam turbine rotors

PL

tarcza wirnika; wirnik turbiny parowej; naprężenie styczne

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2019
• Tom: Vol. 24, no. 2
• Strony: 295--307
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Prasad D. K.

• Department of Mechanical Engineering, Gudlavalleru Engineering College Gudlavalleru- 521356, INDIA

autor

Ramana K. V.

• Department of Mechanical Engineering, K.L. University Vaddeswaram- 522 502, INDIA

autor

Rao N. M.

• Department of Mechanical Engineering, JNT University Kakinada Kakinada-533003, INDIA

Bibliografia

• [1] Naumann H.G. (1982): Steam turbine blade design options: how to specify or upgrade. Proceedings Of The Eleventh Turbomachinery Symposium, pp.29-49.
• [2] Fernando Rueda Martínez, Juan Abugaber Francis, M. Toledo-Velázquez and Ignacio Carvajal (2011): Theoretical and numerical analysis of the mechanical erosion in steam turbine blades. Energy and Power Engineering, pp.227-237.
• [3] Mazur Z., Garcia-Illescas R., Agurirre-Romano J. and Perez Rodriguez N. (2008): Steam turbine blade failure analysis. Engineering Failure Analysis, vol.15, pp.129-141.
• [4] Shankar M., Kumar K. and Ajit Prasad S.L. (2010): T-root blades in a steam turbine rotor: a case study. Engineering Failure Analysis, vol.17, pp.1205-1212.
• [5] Plesiutschnig E. (2016): Fracture analysis of a low pressure steam turbine blade. Engineering Failure Analysis, pp.39-50.
• [6] Vivio F. (2014): Theoretical stress analysis of rotating hyperbolic disk without singularities subjected to thermal load. Journal of Thermal Stresses, vol.37, pp.117-136.
• [7] Vasovic I. (2014): Determination of Stress Intensity Factors in Low Pressure Turbine Rotor Discs. Mathematical Problems In Engineering, vol.4.
• [8] Rao J.S. (2004): Transient stress analysis and fatigue life estimation of turbine blades. Journal of Vibration Accoustics, ASME, vol.126, pp.485-495.