ガスタービン圧縮機静翼の旋回失速時における疲労損傷評価手法 : 第1報, ガスタービン圧縮機翼の余寿命評価

概要

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Compressor stator blades of gas turbines are subjected to severe conditions such as dynamic pressure oscillation due to rotating stall, corrosive operating environments, and a high number of operations. To improve the reliability of such blades, an analytical method for estimating fatigue damage of these blades has been developed. This method is based on blade-vibratory-stress analyses, stress-peak counting, and use of actual environmental data. The blade-vibratory-stress analyses took superposition of multi-peaks of the stress spectrum into account. And the numerically simulated stress from these analyses showed better agreement with measured stress than that from a traditional stress analysis, which is based on frequency-response analysis considering a single peak of the lowest single eigen vibration mode. Furthermore, the fatigue damage of the blade under rotating stall was estimated by the stress-peak counting of synthesized historical stress waves which were given by the blade-stress analyses and from material data.
社団法人日本機械学会の論文
2001-02-25