Selection of High Performance Alloy for Gas Turbine Blade Using Multiphysics Analysis

H Khawaja, M Moatamedi

Abstract


With the extensive increase in the utilization of energy resources in the modern era, the need of energy extraction from various resources has pronounced in recent years. Thus comprehensive efforts have been made around the globe in the technological development of turbo machines where means of energy extraction is energized fluids. This development led the aviation industry to power boost due to better performing engines. Meanwhile, the structural conformability requirements relative to the functional requirements have also increased with the advent of newer, better performing materials. Thus there is a need to study the material behavior and its usage with the idea of selecting the best possible material for its application.

In this work a gas turbine blade of a small turbofan engine, where geometry and aerodynamic data was available, was analyzed for its structural behavior in the proposed mission envelope, where the engine turbine is subjected to high thermal, inertial and aerodynamic loads. Multiphysics Finite Element (FE) linear stress analysis was carried out on the turbine blade. The results revealed the upper limit of Ultimate Tensile Strength (UTS) for the blade. Based on the limiting factor, high performance alloys were selected from the literature. The two most recommended alloy categories for gas turbine blades are NIMONIC and INCONEL from where total of 21 types of INCONEL alloys and 12 of NIMONIC alloys, available on commercial bases, were analyzed individually to meet the structural requirements. After applying selection criteria, four alloys were finalized from NIMONIC and INCONEL alloys for further analysis. On the basis of stress-strain behavior of finalized alloys, the Multiphysics FE nonlinear stress analysis was then carried out for the selection of the individual alloy by imposing a restriction of Ultimate Factor of Safety (UFOS) of 1.33 and yield strength. Final selection is made keeping in view other factors like manufacturability and workability in due consideration.


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References


Immarigeon, J.-P.: The Super Alloys: Materials for Gas Turbine Hot Section Components, Canadian Aeronautics and Space Institute Journal (1981), Vol. 27, pp 336-354.

Singh, M. and G. Lucas, Blade Design and Analysis for Steam Turbines 2011: McGraw-hill.

Boyce, M.P., Gas Turbine Engineering Handbook 2006: Elsevier Science.

Glenny, J. E. Northwood, and A. Burwood-Smith: Materials for Gas Turbine, Int. Met. Rev: 20, (1975), pp 1-28. CrossRef

Special Metals Corporation: Material Handbook of High Performance Alloys (2001). http://www.specialmetals.com

Meetham, G.W., H. Van de Voorde, and M.H. Voorde, Materials for High Temperature Engineering Applications 2000: Springer.

ANSYS® Multiphysics, Version 12.0

ANSYS® Inc., Theory Reference, 1Structures, 2Structures with geometric non-linearities, 3Structure with material non-linearities.

ANSYS® Release 9.0, Documentation, Structural Analysis Guide.

Pro-E, PTC Ltd., US

Nagel, Roger N.; Braithwaite, Walt W.; Kennicott, Philip R. (1980), Initial Graphics Exchange Specification IGES, Version 1.0, Washington DC: National Bureau of Standards, NBSIR 80-1978

C.T.F. Ross: Finite Element Methods in Structural Mechanics: 1985, John Wiley and Sons, Inc.

Leckie, F.A. and D.J.D. Bello, Strength and Stiffness of Engineering Systems 2009: Springer London, Limited.

Bin, H., Computer Aided Production Engineering: Cape 2001-2002: John Wiley & Sons.

Steve F. Krar and J. Williams, Oswald: Technology of Machine Tools, 4th Edition 1991, McGraw-Hill Co.




DOI: http://dx.doi.org/10.1260/1750-9548.8.1.91

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