Empirical and Numerical Study of Gas Turbine Disks under Mechanical Stress and Temperature Gradient

Subject Areas :

Rasoul Yari Yari ¹ , Hamid Zarepour ² , Aazam Ghassemi ³

1 - Department of Mechanical Engineering, Faculty of Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran|Modern Manufacturing Technologies Research Center (MMTRC), Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 - Department of Mechanical Engineering, Faculty of Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran|Modern Manufacturing Technologies Research Center (MMTRC), Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 - Department of Mechanical Engineering, Faculty of Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran|Modern Manufacturing Technologies Research Center (MMTRC), Najafabad Branch, Islamic Azad University, Najafabad, Iran

Received: 2019-10-12 Accepted : 2020-02-03 Published : 2019-05-01

Keywords: Gas Turbine Disks, Mechanical Stress, Temperature Gradient, Finite Element Analysis (FEM),

Abstract :

Gas turbine disks usually operate at very high temperatures and rotate at very high angular velocities under normal working conditions. High temperature in turbine disks causes changes in their properties. High angular velocity creates a large centrifugal force in the disk and high temperature reduces the strength of the material and causes deformation. Complexity of these parameters has turned the determination of stress distribution in gas turbine disks to one of the bottlenecks in the analysis, design and manufacturing of turbine engines. Therefore, using an applicable method for stress analysis is essential in order to better determine stress distribution in turbine disks. In this study, the finite element method (FEA) is used for predicting the behavior of rotating disks under mechanical and thermal stresses. In order to increase the certainty of simulation, gas turbine disk is first simulated and analyzed based on dimensions and loading conditions extracted from previous studies. Then, the results are compared with previous studies in order to determine the accuracy of analysis method applied in ANAQUS software. Afterwards, gas turbine disks are evaluated under both rotational movement and temperature gradient. The results show that the presence of angular velocity and centrifugal force cause expansion to the disk radius. The results show an acceptable correlation between the results of empirical and numerical studies. According to the results, the approach proposed in this study is a suitable method for analysis of the stress, temperature and displacement in turbine disks and other components with similar functions.

References:

[1] Bar, W., Orkisz, M. and Moustapha, H. 2014. Multidisciplinary Design and Optimization of Gas Turbine Engine Low Pressure Turbine at Preliminary Design Stage. Journal of KONES Powertrain and Transport. 21(3): 15-22. 

[2] Liu, J. S., Parks, G. T. and Clarkson, P. J. 2002. Optimization of Turbine Disk Profiles by Metamorphic Development. Journal of Mechanical Design. 124(2): 192-200.

[3] Eraslan, A. and Orcan, Y. 2002. Elastic–plastic Deformation of a Rotating Solid Disk of Exponentially Varying Thickness. Mechanics of Material. 34(7): 423-432.

[4] Eraslan, A. N. and Argeso, H. Limit Angular Velocities of Variable Thickness Rotating Disks. 2002. International Journal of Solids and Structures. 39(12): 3109-3130.

[5] Seireg, A. and Surana, K. S. 1992. Optimum Design of Rotating Disks. ASME. 92: 1- 10.

[6] Ray, G.S., Sinha, B.K. 1992. Profile Optimization of Variable Thickness Rotating Disc. Computers and Structures.  42(5): 809-813.

[7] Chern, J. M. and Prager, W. 1970. Optimum Design of Rotating Disks for Given Radial Displacement of Edge, Journal of Optimization Theory and Applications. 6: 161-170.

[8] Fox, R. L. 1970. Optimization Method for Engineering. Addison - Wesley, London.

[9] Cheu, T. C. 1990. Procedures for Shape Optimization of Gas Turbine Disks. Computers & Structures. 34(1): 1-4.

[10] Luchi, M. L. Poggiali, A. and Persiani, F. 1980. An Interactive Optimization Procedure Applied to the Design of Gas Turbine Discs. Computers & Structures. 11(6): 629-637.

[11] Farshi, B., Jahed, H. and Mehrabian, A. 2004. Optimum Design of Inhomogeneous Non-Uniform Rotating Discs. Computers and Structures. 82(9-10): 773-779.

[12] Jahed, H., Farshi, B. and Bidabadi, J. 2005. Minimum Weight Design of Inhomogeneous Rotating Discs. 2005. International Journal of Pressure Vessels and Piping. 82: 35-41.

[13] Brujic, D., Ristic, M., Mattone, M., Maggiore, P. and De Poli, G. P. 2010. CAD Based Shape Optimization for Gas Turbine Component Design. Structural and Multidisciplinary Optimization. 41(4): 647-659.

[14] S. Derakhshan, S. N. Kasaeian. Design and Optimization of Axial Turbine for Small Hydropower, Journal of Mechanical Engineerin (University of Tabriz), 43(2), pp. 31-40, 2013.

[15] Gutzwiller, D. P. and Turner, M. G. 2010. Rapid Low Fidelity Turbomachinery Disk Optimization. Advances in Engineering Software. 41: 779–791.

[16] Gunston, B. 2009. The Cambridge Aerospace Dictionary, 2nd ed. Cambridge University Press.

[17] Meisl, C. J. 1988. Life-Cycle-Cost Considerations for Launch Vehicle Liquid Propellant Rocket Engine. Journal of Propulsion and Power. 4(2): 26-118.

[18] Zhan, H., Zhao, W. and Wang, H. 2000. Manufacturing Turbine Blisks. Aircraft Engineering and Aerospace Technology. 72(3): 247-251.

[19] Feiner, D. M. and Griffin, J. H. 2004. Mistuning Identification of Bladed Disks Using a Fundamental Mistuning Model-Part II: Application, Journal of Turbomachinery. ASME 126(1): 159-165.

[20] Kostyuk, A. and Forlov, V. 1988. Steam and Gas Turbines, Translated from the Russian by V. Afanasyev, Mir Publishers Moscow.

[21] Rosyid, A., Es-Saheb, M. and Yahia, J. H. 2014. Stress Analysis of Nonhomogeneous Rotating Disc with Arbitrarily Variable Thickness Using Finite Element Method. Journal of Applied Sciences, Engineering and Technology. 15: 3114-3125.

[22] Zharfi, H. and Ekhteraei Toussi H. 2016. Effect of Temperature and Particle Distribution on Creep Behavior of FGM Rotating Discs (In Persian). Journal of Mechanical Engineering. 75(2): 51-59.

[23] EN 1993-1-2: Eurocode 3: Design of Steel Structures - Part 1-2: General Rules - Structural Fire Design.

[24] Stump, F. V. Silva, E. C. N. and Paulino, G. H. 2007. Optimization of Material Distribution in Functionally Graded Structures with Stress Constraints. Communications in Numerical Methods in Engineering. 23(6): 535–551.