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International Journal of Rotating Machinery
Volume 2012 (2012), Article ID 246031, 15 pages
http://dx.doi.org/10.1155/2012/246031
Research Article

Computational Fluid Dynamic Analysis of a Vibrating Turbine Blade

1School of Mechanical and Manufacturing Engineering, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia
2Department of Mechanical Engineering, Curtin University, Bentley, Perth, WA 6102, Australia
3Mechanical Engineering Department, Prince Mohammad Bin Fahd University (PMU), AlKhobar 31952, Saudi Arabia
4Australian Nuclear Science Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DC, NSW 2233, Australia

Received 29 June 2012; Revised 14 September 2012; Accepted 20 September 2012

Academic Editor: Zhaoye Qin

Copyright © 2012 Osama N. Alshroof et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study presents the numerical fluid-structure interaction (FSI) modelling of a vibrating turbine blade using the commercial software ANSYS-12.1. The study has two major aims: (i) discussion of the current state of the art of modelling FSI in gas turbine engines and (ii) development of a “tuned” one-way FSI model of a vibrating turbine blade to investigate the correlation between the pressure at the turbine casing surface and the vibrating blade motion. Firstly, the feasibility of the complete FSI coupled two-way, three-dimensional modelling of a turbine blade undergoing vibration using current commercial software is discussed. Various modelling simplifications, which reduce the full coupling between the fluid and structural domains, are then presented. The one-way FSI model of the vibrating turbine blade is introduced, which has the computational efficiency of a moving boundary CFD model. This one-way FSI model includes the corrected motion of the vibrating turbine blade under given engine flow conditions. This one-way FSI model is used to interrogate the pressure around a vibrating gas turbine blade. The results obtained show that the pressure distribution at the casing surface does not differ significantly, in its general form, from the pressure at the vibrating rotor blade tip.