An experimentally validated multifidelity hybrid model for analyzing the pressure variation of a relief system

Zheng, Feng; Zong, Chuanming; Li, Qing Ye; Qu, Fu Zheng; Song, Xue Guan

doi:10.1016/j.ijpvp.2021.104315

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…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%

“…Once the steady state variables are computed an expression for the overall transfer matrix U, function of ω and δ, can be calculated through Eq. (19). Afterwards, by employing the free end conditions (i.e ℎ 1 𝑟 = 0 and ℎ 6 𝐿 = 0) to the overall transfer matrix 𝑈, the fluctuated flow rate at the intake reservoir 𝑞 1 𝑟 and at the discharge chamber 𝑞 6 𝐿 can be determined as a function of ω and 𝛿.…”

Section: -Theoretical Model Computation Procedurementioning

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: Discussionmentioning

confidence: 99%

Section: -Theoretical Model Computation Procedurementioning

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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Multi-fidelity modeling and analysis of a pressurized vessel-pipe-safety valve system based on MOC and surrogate modeling methods

Song

Liu

et al. 2023

Nuclear Engineering and Technology

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An experimentally validated multifidelity hybrid model for analyzing the pressure variation of a relief system

Cited by 4 publications

References 29 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

Multi-fidelity modeling and analysis of a pressurized vessel-pipe-safety valve system based on MOC and surrogate modeling methods

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