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Research on Characteristics of the Large-Amplitude and Narrow-Band Vibration of a Flexible Flat Plate in the Rectangular Channel

Author: LiuLiFang
Tutor: LuDaoGang
School: North China Electric Power University (Beijing)
Course: Thermal Power Engineering
Keywords: Fluid-structure interaction Flow-induced vibration The narrowband substantial vibration Vortex shedding characteristics Parallel plate fuel assemblies
CLC: TK31
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Abstract


Parallel plate fuel assembly due to the high power density, heat transfer effect good advantages in many advanced research reactor, the military heap widely used. Coolant flow through the fuel assemblies of parallel plate rectangular narrow channel formed between adjacent fuel plates constitute strong fluid-structure interaction relationship between the coolant and the fuel plate may cause threat to the safe operation of nuclear reactors. Parallel plate fuel assemblies in a fuel plate can be seen as a flexible plate in a rectangular channel, flexible flat rectangular channel depth study of fluid-structure interaction characteristics of great significance. This article as a theoretical basis for research using numerical simulation combined with experimental methods to study the the sharp vibration characteristics of the four corners of clamped flexible flat rectangular channel narrowband. Studied by changing the channel width, in the numerical simulation work both sides of the rigid rectangular channel fixed rigid flat plate vortex shedding characteristics, and according to the vortex shedding Manchester Luha change with the change in the width of the flow channel and the intensity of the flat plate structure divided into three categories: wide channels spoiler, transitional spoiler and narrow channel spoiler spoiler problem, which can determine the the flexible flat fluid-structure interaction experiments test section flexible flat spoiler mode for wide flow channel spoiler and to design flexible flat fluid-structure interaction experiments in the test section and the structural dimensions of the test board. Fluid-structure interaction experiments, the use of independent test section and experimental design board, with the current state-of-the-art laser measurement technology, fluid flow rate by changing the test section, both at home and abroad for the first time found a rigid rectangular channel within the four corners of clamped flexible flat narrow frequency substantially vibration phenomenon, and a the narrowband substantial vibration speed conditions; the same time, the determination of the inherent characteristics of the four corners clamped under the conditions of different thickness flexible plate vibration, and take advantage of the added mass cylinder theory to calculate the hydrostatic flexible plate vibration Experimental study of the natural frequency; the narrowband significantly different thickness of the flexible plate vibration through the natural vibration frequency of the axial flow compare different thickness of the four corners of the solid support flexible tablet hydrostatic the narrowband substantial vibration characteristics proved rigid rectangular channel within the four corners of the solid branch flexible flat the narrowband substantial vibration phenomenon is a vibratory plate with the flow of fluid between the resonant coupling and the important flexible tablet narrowband substantial vibration characteristics, in order to further study the mechanism of fluid-structure interaction of the components of the parallel plate laid a theoretical foundation. The first study found that a new mechanism of fluid-structure coupling failure may lead to a parallel plate fuel assemblies to avoid security problems caused by fluid-structure interaction due to the parallel plate fuel assemblies for nuclear reactor design and operation of the process provides a new theoretical specifications and engineering guidance.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal measurement and thermal automatic control > Measurement techniques and instrumentation
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