Evaluation of Fatigue Crack Propagation of a Pump-Turbine Runner based on Measured Dynamic Stresses

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  • 実働変動応力測定に基づくポンプ水車ランナの疲労き裂進展と点検手法の評価
  • ジツドウ ヘンドウ オウリョク ソクテイ ニ モトズク ポンプ スイシャ ランナ ノ ヒロウ キレツ シンテン ト テンケン シュホウ ノ ヒョウカ

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Abstract

We found large fatigue cracks on the runner surfaces of pump-turbines at Kalayaan pumped storage power plant and measured the dynamic stress generated on the runner to find the root cause of the cracks. In this paper, the crack propagation is simulated based on the fracture mechanics using the measured dynamic stresses and the validity of inspection procedure is evaluated whether it is effective to avoid any severe fatigue crack in future.

Journal

  • Turbomachinery

    Turbomachinery 43 (12), 730-737, 2015

    Turbomachinery Society of Japan

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