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Modal characteristics and fatigue strength of compressor blades

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Abstract

High-cycle fatigue (HCF) has been identified as one of the primary causes of gas turbine engine failure. The modal characteristics and endurance strength of a 5 MW gas turbine engine blade developed by Doosan Heavy Industries & Construction Co., Ltd. in HCF fracture were verified through analysis and tests to determine the reliability of the compressor blade. A compressor blade design procedure that considers HCF life was performed in the following order: airfoil and blade profile design, modal analysis, stress distribution test, stress endurance limit test, and fatigue life verification. This study analyzed the Campbell diagram and estimated resonance risk on the basis of the natural frequency analysis and modal test of the compressor blade to guarantee safe and operational reliability. In addition, the maximum stress point of the compressor blade was determined through stress distribution analysis and test. The bonding point of the strain gage was determined by using fatigue test. Stress endurance limit test was performed based on the results of these tests. This research compared and verified the modal characteristics and endurance strengths of the compressor blades to prevent HCF fracture, which is among the major causes of gas turbine engine damage. A fatigue life design procedure of compressor blades was established. The 5 MW class gas turbine compressor blade is well designed in terms of resonance stability and fatigue endurance limit.

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Authors and Affiliations

  1. Doosan Heavy Industries & Construction, 555, Changwon, Kyungnam, 641-712, Korea

    Kyungkook Kim

  2. Dept. of Mechanical Design Engineering, Chung-Nam National University, Daejeon, Korea

    Young Shin Lee

Authors
  1. Kyungkook Kim
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  2. Young Shin Lee
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Correspondence to Young Shin Lee.

Additional information

Recommended by Associate Editor Chang-Wan Kim

Kyungkook Kim received a B.S. degree in Mechanical Engineering from Korea Aerospace University, Korea, in 2000. He received a master’s degree in Mechanical Design Engineering at Chungnam National University, Korea. He is currently working in Doosan Heavy Industries & Construction as a senior research engineer. His research interests include gas turbine design.

Young-Shin Lee received a B.S. degree in Mechanical Engineering from Yonsei University, Korea, in 1972. He received a master’s degree and Ph.D. in Mechanical Engineering from Yonsei University, Korea, in 1974 and 1980, respectively. He is currently a professor of the Department of Mechanical Design Engineering at Chungnam National University, Korea. Professor Lee’s research interests are in the area of impact mechanics, optimal design, biomechanical analysis, and shell structure analysis.

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Kim, K., Lee, Y.S. Modal characteristics and fatigue strength of compressor blades. J Mech Sci Technol 28, 1421–1429 (2014). https://doi.org/10.1007/s12206-014-0129-z

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  • DOI: https://doi.org/10.1007/s12206-014-0129-z

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