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LP Last Stage Steam Turbine Blade Vibrations Due to Mistuning

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Abstract

Background

The self-excitation of last stage of slender blades leading to high vibration amplitudes is a problem encountered in the exploitation of LP steam turbines. This has been resolved by changing the geometry of alternate blades (mistuning).

Method

This paper studies the free and forced blade vibrations of various thus mistuned steam turbine systems. Two methods of mistuning are applied: either by changing the blade geometry or by changing the Young’s Modulus.

Results

In the LP steam turbine last stage, the nodal diameters of blades are destroyed by even the slightest changes to natural blade frequencies and only individual blades vibrate. Blade feathering does make nodal diameters appear, but only in every second blade. The blade geometry mistuning gives more reliable results.

Conclusions

A comparison of the geometrical and material mistuning reveals completely different results. In the case of long blades, geometrical mistuning is recommended. The maximal blade stress location changes, depending on the form of mistuning.

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Acknowledgements

Finance for this research came from project Polish Government funds PBS1/B4/5/2012. All numerical calculations were made at the Academic Computer Centre TASK (Gdansk, Poland).

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Authors and Affiliations

  1. The Szewalski Institute of Fluid Flow Machinery, Fiszera 14, 80-952, Gdansk, Poland

    Leszek Kubitz & Romuald Rzadkowski

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  1. Leszek Kubitz
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  2. Romuald Rzadkowski
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Correspondence to Romuald Rzadkowski.

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Kubitz, L., Rzadkowski, R. LP Last Stage Steam Turbine Blade Vibrations Due to Mistuning. J. Vib. Eng. Technol. 6, 309–316 (2018). https://doi.org/10.1007/s42417-018-0039-y

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  • DOI: https://doi.org/10.1007/s42417-018-0039-y

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