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http://dx.doi.org/10.5855/ENERGY.2020.29.3.007

The CFD Analysis for the Fatigue Life Evaluation of HRSG Structure  

Kim, Jinbeom (Graduated School of Energy System Engineering, Seoul National Univ. of Science and Technology)
Kim, Chulho (Department of Mechanical & Automotive Engineering, Seoul National Univ. of Science and Technology)
Publication Information
Journal of Energy Engineering / v.29, no.3, 2020 , pp. 7-17 More about this Journal
Abstract
Heat recovery steam generator(HRSG) generate steam using the high-temperature exhaust energy of gas turbines. Structures of HRSG are damaged by flow induced vibration of flue gas in some cases. In order to evaluate fatigue life to predict damage to a structure, a vibration analysis caused from flue gas should be used to derive the Power Spectral Density(PSD). However, it is very difficult to experimentally derive the vibrations generated by the exhaust gas form of gas turbines, which is very fast and complex. It was able to establish a way to identify vibration characteristics depending on the location of the structure by using high computing resources, large eddy simulation (LES). Random vibration analysis through these vibration characteristics(PSD) can evaluate the fatigue life of a structure.
Keywords
heat recovery steam generator(HRSG); gas turbine; flow induced vibration; LES; PSD; fatigue life evaluation;
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