Numerical Model of Fluid Induced Vibration Force of Reactor Internals

doi:10.11885/j.issn.1674-5086.2020.09.09.05

Abstract

Abstract: Aiming at difficulty in obtaining fluid exciting force in the flow induced vibration analysis and evaluation of reactor internals, the numerical model of three-dimensional flow field analysis of typical reactor internals is studied based on computational fluid dynamics (CFD). Firstly, according to the structural characteristics and operating parameters of reactor internals, the key components and physical boundaries of the actual structure are extracted and simplified, so as to reduce the calculation scale reasonably and retain the flow field characteristics. Secondly, considering the computational resources and efficiency, the hybrid grid generation method of structural grid and unstructured grid and the partition grid size strategy are adopted. In order to capture the characteristics of the flow field, porous media is used to simulate the core section with complex flow field but not paying attention to its details, and then a three-dimensional flow field analysis model suitable for engineering is established. Three turbulence models with good prediction results are compared. The three-dimensional streamline and pressure distribution characteristics of reactor internals, the time history and PSD characteristics of pressure fluctuation at typical monitoring points, the prediction of fluid excitation forces of reactor internals by three turbulence models, and the characteristics of fluid exciting force acting on the surface of the core barrel are obtained. The results show that LES model can predict the fluid induced vibration forces of reactor internals, and has a certain conservatism. The fluid induced vibration forces acting on reactor internals conform to the wide-band and randomness. It can provide key parameters and input loads for flow induced vibration analysis and evaluation of reactor internals.

Key words: reactor internals, flow-induced vibrations, large eddy simulation, turbulent excitation, numerical model

CLC Number:

O322

FENG Zhipeng, HUANG Xuan, LIU Shuai, SHEN Pingchuan, CAI Fengchun. Numerical Model of Fluid Induced Vibration Force of Reactor Internals[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 143-151.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.09.09.05

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I6/143

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