This paper presents a study on low-pressure (LP) turbine bending flutter. The study is performed using a semi-analytical model, which is validated against experimental and computational fluid dynamics (CFD) data. The validation highlights the ability of even the simplest models to represent accurately the flutter behavior of the LP turbine assemblies. A parametric study is then performed into the effect of modifications of the blade camber line on the stability of bending modes. Variations in maximum camber position, leading edge and trailing edge metal angles, and stagger are considered. The modifications are applied to a family of aerodynamically well designed aerofoils and to a family of aerodynamically poorly designed aerofoils. Trends relating damping to the parameters describing the camber line modifications are identified. These trends are found to apply to both families of aerofoils. Furthermore, it is found that the behavior of all aerofoils studied can be characterized by their behavior at a specific flow angle and by a simple algebraic relation based on true incidence. This behavior also seems to be universal.
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May 2016
Research-Article
An Aerodynamic Parameter for Low-Pressure Turbine Flutter
Fernando Barbarossa,
Fernando Barbarossa
Vibration UTC,
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: fernando.barbarossa12@imperial.ac.uk
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: fernando.barbarossa12@imperial.ac.uk
Search for other works by this author on:
Luca di Mare
Luca di Mare
Vibration UTC,
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: l.di.mare@imperial.ac.uk
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: l.di.mare@imperial.ac.uk
Search for other works by this author on:
Fernando Barbarossa
Vibration UTC,
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: fernando.barbarossa12@imperial.ac.uk
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: fernando.barbarossa12@imperial.ac.uk
Anthony B. Parry
Jeffrey S. Green
Luca di Mare
Vibration UTC,
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: l.di.mare@imperial.ac.uk
Department of Mechanical Engineering,
Imperial College London,
London SW7 2BX, UK
e-mail: l.di.mare@imperial.ac.uk
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received February 23, 2015; final manuscript received September 7, 2015; published online January 12, 2016. Assoc. Editor: Rakesh Srivastava.
J. Turbomach. May 2016, 138(5): 051001 (11 pages)
Published Online: January 12, 2016
Article history
Received:
February 23, 2015
Revised:
September 7, 2015
Citation
Barbarossa, F., Parry, A. B., Green, J. S., and di Mare, L. (January 12, 2016). "An Aerodynamic Parameter for Low-Pressure Turbine Flutter." ASME. J. Turbomach. May 2016; 138(5): 051001. https://doi.org/10.1115/1.4032184
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