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An Experimental and Numerical Investigation of the Effect of Notches on the Root of Gas Turbine Compressor Blades on Critical Speeds

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Abstract

The blade of a gas turbine is one of the most sensitive parts so that it can be called the heart of the gas turbine. Blades work in strict operational and environmental conditions and thus require careful analysis, inspection, and visits to prevent the sudden extinction of the gas turbine. This paper analyzes gas turbine compressor blades in three conditions (a notch-free blade, a blade with one notch in the root, and a blade with two notches in the root) by modal test and finite element methods. According to the analysis of the results obtained from the two methods for the blade sample in the expressed conditions, it is observed that the natural frequencies and critical speeds were decreased by about 6.5 and 9.5% in the sample with one notch and two notches in the root compared to the notch-free blade, respectively. The presence of a notch on the blade root has a significant effect on the impact response and frequency of the blade. The presence of two notches on the root of the blade has a twice as great impact on reducing the damping and stiffness of the blade, because of which the natural frequencies of the blade are also reduced.

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  • 13 October 2022

    The corresponding author’s email address was corrected.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Petroleum University of Technology, Abadan, Iran

    S. M. H. Sharifi & P. Edalat

  2. Master of Mechanical Engineering, Mapna Operation and Repair Company, Tehran, Iran

    A. R. Vardi

  3. Master of Mechanical Engineering, Petroleum University of Technology, Abadan, Iran

    S. Tabasi

Authors
  1. S. M. H. Sharifi
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  2. P. Edalat
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  3. A. R. Vardi
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  4. S. Tabasi
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Correspondence to S. M. H. Sharifi.

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Sharifi, S.M.H., Edalat, P., Vardi, A.R. et al. An Experimental and Numerical Investigation of the Effect of Notches on the Root of Gas Turbine Compressor Blades on Critical Speeds. J Fail. Anal. and Preven. 22, 1733–1743 (2022). https://doi.org/10.1007/s11668-022-01462-1

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  • DOI: https://doi.org/10.1007/s11668-022-01462-1

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