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<p>Safety valves are critical safety devices in pressure-bearing equipment used in the energy sector. Due to long-term erosion and wear by the medium, the sealing surfaces of their valve seats are prone to damage, which leads to internal leakage. This not only causes ineffective loss of energy medium and exacerbates the pressure on energy conservation and consumption reduction, but also poses a significant safety hazard, threatening the stable operation of the energy system. Acoustic emission signal technology, as a mainstream non-destructive testing method, has been widely used in the detection of internal leakage in safety valves. However, it lacks theoretical support for the acoustic characteristics of internal leakage aerodynamic noise, which limits the accuracy and reliability of the detection. This paper studies the internal leakage aerodynamic noise of a spring-loaded full-lift safety valve. Large eddy simulation (LES) is used to perform numerical calculations of transient internal leakage flow to capture velocity pulsations in the fluid domain. The Lighthill tensor is solved using a energy-conserving mapping method as the excitation source, and the acoustic solution is completed by combining the Ffowcs Williams-Hawkings (FW-H) equations to obtain the sound pressure level curve and contour map of internal leakage aerodynamic noise. The study found that the sound pressure pulsation of internal leakage is dominated by quadrupoles, and the main peak frequency of internal leakage is negatively correlated with the total sound pressure level. The relative error between the numerical simulation and experimental results is ≤ 5%, indicating good accuracy. This research fills a theoretical gap in the acoustic characteristics of internal leakage, provides theoretical guidance for the acoustic detection of internal leakage, can improve the accuracy of leakage detection, achieve early warning, reduce energy waste, help save energy and reduce consumption, and has important engineering application value for ensuring the safe and stable operation of energy systems.</p>

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Study on the internal leakage pneumatic noise acoustic characteristics of spring-loaded full-lift safety valve

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月3日

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  • Chuiyu Qiu,
  • Kang Yuan,
  • Tianlong Wang,
  • Jianjun Hou,
  • Han Lu,
  • XiaoQi Meng,
  • Shuxun Li

摘要

Safety valves are critical safety devices in pressure-bearing equipment used in the energy sector. Due to long-term erosion and wear by the medium, the sealing surfaces of their valve seats are prone to damage, which leads to internal leakage. This not only causes ineffective loss of energy medium and exacerbates the pressure on energy conservation and consumption reduction, but also poses a significant safety hazard, threatening the stable operation of the energy system. Acoustic emission signal technology, as a mainstream non-destructive testing method, has been widely used in the detection of internal leakage in safety valves. However, it lacks theoretical support for the acoustic characteristics of internal leakage aerodynamic noise, which limits the accuracy and reliability of the detection. This paper studies the internal leakage aerodynamic noise of a spring-loaded full-lift safety valve. Large eddy simulation (LES) is used to perform numerical calculations of transient internal leakage flow to capture velocity pulsations in the fluid domain. The Lighthill tensor is solved using a energy-conserving mapping method as the excitation source, and the acoustic solution is completed by combining the Ffowcs Williams-Hawkings (FW-H) equations to obtain the sound pressure level curve and contour map of internal leakage aerodynamic noise. The study found that the sound pressure pulsation of internal leakage is dominated by quadrupoles, and the main peak frequency of internal leakage is negatively correlated with the total sound pressure level. The relative error between the numerical simulation and experimental results is ≤ 5%, indicating good accuracy. This research fills a theoretical gap in the acoustic characteristics of internal leakage, provides theoretical guidance for the acoustic detection of internal leakage, can improve the accuracy of leakage detection, achieve early warning, reduce energy waste, help save energy and reduce consumption, and has important engineering application value for ensuring the safe and stable operation of energy systems.