Multi-scale contact characteristics and leakage prediction of flange seal based on fractal geometry

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2025-02-01 Epub Date: 2025-01-13 DOI:10.1016/j.nucengdes.2025.113835

Feng Li , Lushuai Xu , Shaohua Dong , Dongying Wang , Xiujuan Dong , Biao Pan , Quan Liu

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Abstract

Flanges serve as the sealing and connecting components in nuclear power plant pipelines and pressure vessels. The contact gaps between flanges and gaskets can lead to flange sealing failure. Therefore, optimal flange sealing surfaces are essential for ensuring the safety and reliability of airtight pipeline systems. This paper examined the flange sealing surfaces in a nuclear power plant. A sealing contact model was established according to the characteristic parameters of the surface contours measured during the experiment, while the finite element method was used to determine the sealing contact characteristics and predict the leakage of the rough sealing contact surface. The results indicated that the surface roughness had a multi-scale effect while the sealing state was related to the sealing characteristics scale. The sealing surface morphology, material properties, and operational conditions directly affected the sealing interface structure and sealing performance. In addition, the contact clearance of the sealing surface decreased in conjunction with increased applied load, normal compression displacement, and surface roughness, while the surface leakage rate increased at a higher surface contact clearance and pipeline conveying pressure.

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基于分形几何的法兰密封多尺度接触特性及泄漏预测

法兰是核电站管道和压力容器的密封和连接部件。法兰与垫片之间的接触间隙会导致法兰密封失效。因此，优化法兰密封面对于保证密封管道系统的安全性和可靠性至关重要。本文对某核电站法兰密封面进行了检测。根据实验中测得的表面轮廓特征参数建立了密封接触模型，采用有限元法确定了密封接触特性，并对粗糙密封接触表面的泄漏进行了预测。结果表明，表面粗糙度具有多尺度效应，而密封状态与密封特性尺度有关。密封面形貌、材料性能和操作条件直接影响密封界面结构和密封性能。此外，密封面的接触间隙随着施加载荷、法向压缩位移和表面粗糙度的增加而减小，而在更高的表面接触间隙和管道输送压力下，表面泄漏率增加。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.