Graduate Thesis Or Dissertation
 

Comprehensive Characterization of Motion of a Helical Coil Due to Flow Induced Vibration

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j3860958p

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  • Mechanical vibrations compromise the integrity of key components of thermal power plants. Without careful design, strong resonances during steady state operation can wear these components to the point of failure, leading to an unsafe situation that may force a plant to shut down. The purpose of this research is to further the understanding of the vibrations induced in a helical coil subject to steady fluid flow. A helical coil steam generator, such as that found in most integral pressurized water reactors, appears to eliminate many flow-induced vibration concerns when compared to traditional steam generators; however this has yet to be clearly demonstrated experimentally. The objective of this work is to develop a method of characterizing the motion of a helical coil in an annulus subject to external axial-flow of water. This is accomplished by observing the motion of a helical coil mounted to an inner opaque cylinder through an outer glass tube using a high speed video camera. A mirrored image-pair is used to observe this structure from two perspectives simultaneously, allowing for three-dimensional characterization of the coil motion. The experimental facility is described in detail. The method developed herein for identifying specific points on the coil from images and mapping them to the coil location using the law of refraction is described. A Matlab code conducts temporal measurement of the coil motion. An uncertainty analysis of the coil position measurement is conducted based on geometry and refractive index which can be readily applied to measurements obtained using this method.
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file details HarmonPaulL2015.pdf 2017-08-14 Público Descargar