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<p>Safety valves are important overpressure protection devices in nuclear power regulators and main steam systems, and internal leakage is one of the most common forms of failure. The LES/Möhring acoustic analog method is used to study the acoustic mechanism of internal leakage in safety valves. The simulation results show that the internal leakage from the safety valve is a highly under-expanded supersonic restricted jet process accompanied by high-pressure blockage injection noise and vortex noise, which exhibits broadband characteristics. The maximum velocity of the internal leakage increases slowly with inlet pressure, and the total sound pressure level also grows slowly, in accordance with the prediction of Lighthill's U<sup>8</sup> law. The change rule of internal leakage noise sound pressure level with distance and the results of far-field directivity show that the measurement point is arranged within 0.3&#xa0;m from the leakage port, and the low-frequency signal analysis of the measurement point with an angle of 114° is the best program. The results of the study can provide theoretical guidance for the safety valve detection method based on the internal leakage noise signal analysis.</p>

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Acoustic characterization of internal leakage in safety valves based on large eddy simulation and Möhring acoustic analogy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月17日

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  • Yanbing Zhang,
  • Zhongyuan Xu,
  • Zhitao Sun,
  • Ying Chen,
  • Cheng Zhang

摘要

Safety valves are important overpressure protection devices in nuclear power regulators and main steam systems, and internal leakage is one of the most common forms of failure. The LES/Möhring acoustic analog method is used to study the acoustic mechanism of internal leakage in safety valves. The simulation results show that the internal leakage from the safety valve is a highly under-expanded supersonic restricted jet process accompanied by high-pressure blockage injection noise and vortex noise, which exhibits broadband characteristics. The maximum velocity of the internal leakage increases slowly with inlet pressure, and the total sound pressure level also grows slowly, in accordance with the prediction of Lighthill's U8 law. The change rule of internal leakage noise sound pressure level with distance and the results of far-field directivity show that the measurement point is arranged within 0.3 m from the leakage port, and the low-frequency signal analysis of the measurement point with an angle of 114° is the best program. The results of the study can provide theoretical guidance for the safety valve detection method based on the internal leakage noise signal analysis.