Fluid-structure coupling analysis of a pressure vessel-pipe-safety valve system with experimental and numerical methods

Zong, Chaoyong; Li, Qingye; Zheng, Fengjie; Chen, Dianjing; Li, Xiaofeng; Song, Xueguan

doi:10.1016/j.ijpvp.2022.104707

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Finally, the theoretical model confirmed that the frequency of the penstock pressure fluctuations lies in the same proclaimed frequency range from 1 Hz to 3 Hz, as in Figure 10. In which, the computed results proved that at large gap angles θg ≥ 70 o , the seal's equivalent stiffness keq decreases significantly because the seal's structure stiffness reduces at a significant rate, see Eq (21). As a result, the seal's vibration frequency reduces at higher gap angles, such as in Figure 10b.…”

Section: (Tiv) Self-excited Vibrationsmentioning

confidence: 75%

“…Finally, this study can help in interpreting the vibrations of other types of valves (check valves, and pressure relief valves) [17][18][19][20][21] that operate at small openings since they share a common feature regarding the development of the destabilizing force. A common feature for the developing of the valve's vibration instability is that when the fluid system and the valve obstructing element are in oscillatory motion, they interact in a way that the fluid force reinforces the oscillatory motion of the valve's obstructing element.…”

Section: Discussionmentioning

confidence: 99%

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Turbine inlet valve’s self-excited vibrations risk the safe operation of hydropower plants

Awad

Parrondo

2023

Preprint

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The main function of the turbine inlet valve (TIV) in a hydroelectric power plant is to prevent flow of water to the turbine whenever the turbine is not operating. Usually, the valve responsible for this operation is spherical with annular seals to perform the sealing function. Occasionally, when the valve is set into a closed orientation, the annular seal may not execute its sealing function properly though develop periodic oscillations accompanied by periodic leakage flows. These seal vibrations cause pressure fluctuations in the penstock pipeline, which risks the plant’s reliable and safe operation. So, the primary goal of this research is to present a simplified theoretical model, able to clarify the excitation mechanism of the periodic seal vibration and simulate the plant's transient behavior. Afterwards, develop some recommendations to enhance the stable operation of the (TIV). The system governing equations comprises the water hammer equations to model the water flow through the various pipelines, the vibrating seal equation of motion, and the system boundary conditions. Results revealed that the dynamic instability of the (TIV) vibrations is more likely to arise at higher input reservoir energy levels and at the 1st harmonic of the seal oscillation. Also, modifying the (TIV) by increasing pilot pipeline head losses and reducing its diameter can eliminate the (TIV) vibrations and warrant the plant’s safe operation.

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Section: (Tiv) Self-excited Vibrationsmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Turbine inlet valve’s self-excited vibrations risk the safe operation of hydropower plants

Awad

Parrondo

2023

Preprint

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Turbine Inlet Valve’s Self-Excited Vibrations Risk the Safe Operation of Hydropower Plants

Awad

Parrondo

2023

J. Vib. Eng. Technol.

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Purpose The main function of the turbine inlet valve (TIV) in a hydroelectric power plant is to prevent flow of water to the turbine whenever the turbine is not operating. Usually, the valve responsible for this operation is spherical with annular seals to perform the sealing function. Occasionally, when the valve is set into a closed orientation, the annular seal may not execute its sealing function properly though develop periodic oscillations accompanied by periodic leakage flows. These seal vibrations cause pressure fluctuations in the penstock pipeline, which risks the plant’s reliable and safe operation. Therefore, the primary goal of this research is to present a simplified theoretical model, able to clarify the excitation mechanism of the periodic seal vibration and simulate the plant’s transient behavior. Afterwards, develop some recommendations to enhance the stable operation of the (TIV). Methods The system governing equations comprises the water hammer equations to model the water flow through the various pipelines, the vibrating seal equation of motion, and the system boundary conditions. Results The dynamic instability of the (TIV) vibrations is more likely to arise at higher input reservoir energy levels and at the first harmonic of the seal oscillation. In addition, modifying the (TIV) by increasing pilot pipeline head losses and reducing its diameter can eliminate the (TIV) vibrations and warrant the plant’s safe operation. Conclusion Results revealed that fluid compressibility and acoustic transmission have a decisive effect on the fluid-dynamic forces acting on the seal and the (TIV) stability. In addition, the origin of the (TIV) vibrations is the valve leakage flow through the service seal.

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Transient characteristics simulation and flow-field analysis of high-pressure pneumatic pilot-driven on/off valve via CFD method

Zhang,

Tao,

Yang

et al. 2024

Flow Measurement and Instrumentation

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Fluid-structure coupling analysis of a pressure vessel-pipe-safety valve system with experimental and numerical methods

Cited by 5 publications

References 22 publications

Turbine inlet valve’s self-excited vibrations risk the safe operation of hydropower plants

Turbine inlet valve’s self-excited vibrations risk the safe operation of hydropower plants

Turbine Inlet Valve’s Self-Excited Vibrations Risk the Safe Operation of Hydropower Plants

Transient characteristics simulation and flow-field analysis of high-pressure pneumatic pilot-driven on/off valve via CFD method

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