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<p>The structural integrity and operational reliability of pressure control valves in nuclear power plant piping systems are critical, as their safety functions demand high stability. However, under transient conditions, flow-induced vibration due to vortex shedding and phase change can cause harmful oscillations of the valve core, threatening sealing integrity, actuator performance, and system safety. This study investigates a multi-stage sleeve control valve for deaerator applications. Combining multi-stage pressure reduction with valve dynamics, computational fluid dynamics (CFD) was used with real steam as the working fluid. Two typical opening conditions (14% and 28%) were simulated after mesh independence verification and geometry simplification. Steam properties were implemented via a user-defined function (UDFs). Transient flow fields were computed using Fluent to capture pressure fluctuations at the valve core base, followed by spectral analysis via Fast Fourier Transform (FFT) to identify hydrodynamic excitation sources.The results show that under the selected conditions, the pressure differentials across the simplified valve model are 2.11&#xa0;MPa and 2.71&#xa0;MPa, respectively. The dominant frequency range of flow‑induced vibration lies between 168.336&#xa0;Hz and 252.504&#xa0;Hz, closely matching the periodic vortex shedding frequency induced by flow separation, confirming vortex shedding as the primary excitation mechanism. Compared with 14% opening, at 28% opening the flow uniformity significantly improves, the pressure gradient becomes gentler, and both turbulent kinetic energy intensity and the high‑turbulence region are markedly reduced, indicating effective suppression of flow separation and vortex shedding, thus substantially lowering the flow-induced vibration amplitude. The integrated framework established herein provides a validated engineering template for designing high‑reliability valves in nuclear and other critical industrial applications, enhancing operational safety and reducing life-cycle maintenance costs.</p>

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Research on the Structural Design and Flow Field Characteristics of Multi-Stage Sleeve Maintaining Valves in Nuclear Deaerators Using CFD

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Y. Li,
  • R. Sang,
  • Q. Hou,
  • Y. Liu

摘要

The structural integrity and operational reliability of pressure control valves in nuclear power plant piping systems are critical, as their safety functions demand high stability. However, under transient conditions, flow-induced vibration due to vortex shedding and phase change can cause harmful oscillations of the valve core, threatening sealing integrity, actuator performance, and system safety. This study investigates a multi-stage sleeve control valve for deaerator applications. Combining multi-stage pressure reduction with valve dynamics, computational fluid dynamics (CFD) was used with real steam as the working fluid. Two typical opening conditions (14% and 28%) were simulated after mesh independence verification and geometry simplification. Steam properties were implemented via a user-defined function (UDFs). Transient flow fields were computed using Fluent to capture pressure fluctuations at the valve core base, followed by spectral analysis via Fast Fourier Transform (FFT) to identify hydrodynamic excitation sources.The results show that under the selected conditions, the pressure differentials across the simplified valve model are 2.11 MPa and 2.71 MPa, respectively. The dominant frequency range of flow‑induced vibration lies between 168.336 Hz and 252.504 Hz, closely matching the periodic vortex shedding frequency induced by flow separation, confirming vortex shedding as the primary excitation mechanism. Compared with 14% opening, at 28% opening the flow uniformity significantly improves, the pressure gradient becomes gentler, and both turbulent kinetic energy intensity and the high‑turbulence region are markedly reduced, indicating effective suppression of flow separation and vortex shedding, thus substantially lowering the flow-induced vibration amplitude. The integrated framework established herein provides a validated engineering template for designing high‑reliability valves in nuclear and other critical industrial applications, enhancing operational safety and reducing life-cycle maintenance costs.