Work

Research on the construction of power spectral density function on the core barrel surface of pressurized water reactor

Year: 2025

Type: article

Abstract: The construction of random turbulent excitation on the surface of reactor core barrel plays a very important role in the vibration fatigue analysis of the core barrel structure. In order to construct the power spectral density function of the core barrel surface, a semi-empirical formula is proposed based on the experimental load data and the turbulent kinetic energy simulated by Reynolds-Averaged Navier-Stokes (RANS). Firstly, through the hydraulic simulation test of the reactor internals, the fluid load and power spectral density function of the key points on the core barrel surface were obtained. Then, the fluid simulation of the reactor internals was carried out by Computational Fluid Dynamics (CFD) RANS solutions to obtain the turbulent kinetic energy on the surface of core barrel. Finally, the undetermined coefficient in the empirical formula was determined by the least square method. The results show that the semi-empirical formula proposed in this paper has a high degree of fitting reduction to the power spectral density of the measuring point. This method can obtain the load of the non-measuring point on the surface of the core barrel, which brings great convenience to the engineering design and evaluation of the flow-induced vibration of the reactor core barrel.

Source: Nuclear Engineering and Technology

DOI: 10.1016/j.net.2025.103688

Authors: Tiancai Tan, Hongwei Qiao, Jianzhong Ma, Zhide Xi, Jiang Lai

Institutions: Nuclear Power Institute of China, University of Electronic Science and Technology of China

Language: English

Topic: Fluid Dynamics and Vibration Analysis

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $200