Analysis of Fretting Fatigue Strength of Integral Shroud Blade for Steam Turbine

Analysis of Fretting Fatigue Strength of Integral Shroud Blade for Steam Turbine

To improve the reliability and the thermal efficiency of LP (Low Pressure) end blades of steam turbine, new standard series of LP end blades have been developed. The new LP end blades are characterized by the ISB (Integral Shroud Blade) structure. In the ISB structure, blades are continuously couple...

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Veröffentlicht in:Journal of Power and Energy Systems 2008, Vol.2(3), pp.909-920
Hauptverfasser: KANEKO, Yasutomo, TOMII, Masayuki, OHYAMA, Hiroharu, KURIMURA, Takayuki
Format: Artikel
Sprache:eng
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Blade
Fretting Fatigue
Nonlinear Analysis
Vibration
Vibratory Stress
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container_issue 3
container_start_page 909
container_title Journal of Power and Energy Systems
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creator KANEKO, Yasutomo
TOMII, Masayuki
OHYAMA, Hiroharu
KURIMURA, Takayuki
description To improve the reliability and the thermal efficiency of LP (Low Pressure) end blades of steam turbine, new standard series of LP end blades have been developed. The new LP end blades are characterized by the ISB (Integral Shroud Blade) structure. In the ISB structure, blades are continuously coupled by blade untwist due to centrifugal force when the blades rotate at high speed. One of the probable failure modes of the ISB structure seems to be fretting fatigue, because the ISB utilizes friction damping between adjacent shrouds and stubs. Therefore, in order to design a blade with high reliability, the design procedure for evaluating the fretting fatigue strength was established by the model test and the nonlinear contact analysis. This paper presents the practical design method for predicting the fretting fatigue strength of the ISB structure, and the some applications are explained.
doi_str_mv 10.1299/jpes.2.909
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subjects Blade
Fretting Fatigue
Nonlinear Analysis
Vibration
Vibratory Stress
title Analysis of Fretting Fatigue Strength of Integral Shroud Blade for Steam Turbine
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