Experimental Study of Aerodynamic and Structural Damping in a Full-Scale Rotating Turbine

Author:

Kielb J. J.1,Abhari R. S.2

Affiliation:

1. Rolls-Royce, P.O. Box 420, Speed Code T-10B, Indianapolis, IN 46241

2. Turbomachinery Lab, Swiss Federal Institute of Technology, Zurich 8126, Switzerland

Abstract

Damping in turbomachinery blades has been an important parameter in the study of forced response and high-cycle fatigue, but because of its complexity the sources and physical nature of damping are still not fully understood. This is partly due to the lack of published experimental data and supporting analysis of real rotating components. This paper presents the results of a unique experimental method and data analysis study of multiple damping sources seen in actual turbine components operating at engine conditions. The contributions of both aerodynamic and structural damping for several different blade vibration modes, including bending and torsion, were determined. Results of the experiments indicated that aerodynamic damping was a large component of the total damping for all modes. A study of structural damping as a function of rotational speed was also included to show the effect of friction damping at the blade and disk attachment interface. To the best of the authors’ knowledge, the present paper is the first report of independent and simultaneous structural and aerodynamic damping measurement under engine-level rotational speeds.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference11 articles.

1. Srinivasan, A. V. , 1984, “Vibrations of Bladed-Disk Assemblies—A Selected Survey,” ASME J. Vib., Acoust., Stress, Reliab. Des., 106, pp. 165–168.

2. Srinivasan, A. V., and Cutts, D. G., 1984, “Measurement of Relative Vibratory Motion at the Shroud Interfaces of a Fan,” ASME J. Vib., Acoust., Stress, Reliab. Des., 106, pp. 189–197.

3. Yang, B. D., and Menq, C. H., 1997, “Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading,” ASME Paper No. 97-GT-97.

4. Sanliturk, K. Y., Ewins, D. J., and Stanbridge, A. B., 1999, “Underplatform Dampers for Turbine Blades: Theoretical Modeling, Analysis, and Comparison With Experimental Data,” ASME Paper No. 99-GT-335.

5. Jeffers, T., Kielb, J., and Abhari, R., 2000, “A Novel Technique For Measurement of Rotating Blade Damping,” ASME Paper No. 2000-GT-0359.

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