報告書番号

T01045

タイトル（和文）

渦電流法に基づくガスタービン動翼の非破壊損傷評価 -第3報： 動翼非破壊き裂検出装置の開発 -

タイトル（英文）

Eddy-current Techniques for Nondestructive Assessment of Land-based Gas Turbine Blades― Part 3: Development of nondestructive crack detection equipment ―

概要 （図表や脚注は「報告書全文」に掲載しております）

発電用ガスタービン動翼の寿命や耐食コーティングのリコーティングに影響を及ぼすき裂深さに関する非破壊評価手法の開発が要求されている．動翼の三次元複雑形状による検査面とECTプローブの距離の変化に起因するノイズを低減できるアレイプローブを開発し，タービンケーシングが開放された状態で，初段動翼をロータから取り外すことなく，前縁部，背側および腹側の表面き裂をアレイプローブにより高速に検査できる非破壊き裂検出装置を開発した．

概要 （英文）

There has been a growing need in the electric utility industry to assess the remaining life of blades in gas turbines. The need for life assessment technology is driven by a number of economic factors. It is quite important to nondestructively comprehend the depths of surface-breaking cracks for the life assessment and judgmental standards for extending life of blades. Eddy current testing (ECT) is very attractive because it offers both very high detectablity and high scanning speeds. It is not straightfoward to apply a conventional ECT probe to the blades having complex geometry, however. Flexible ECT probe arrays have been developed to overcome the major limitations of existing systems. The use of an array of sensors allows cracks of all lengths to be detected and will ultimately allow realtime data imaging to provide rapid inspection and easy interpretation. For this study using eddy current techniques, crack detection equipment was developed and applied to 1100C-class gas turbine blades for field use. By using this equipment, ECT data can be quickly taken at leading edges, and concave and convex sides of the blade mounted in a rotor after a turbine casing is removed.

報告者

キーワード