Nonlinear dynamic performance of the turbine inlet valves in hydroelectric power plants

Awad, Hesham; Parrondo, Jorge

doi:10.1177/16878132221145269

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…In accordance with the mentioned studies, (TIV) vibration is a significant issue that can jeopardize the power plant's safe and reliable operation. In fact, the authors have previously studied the problem of the (TIV) vibration in the Salime plant as in [12][13]. In these studies, the developed theoretical models can explain the cause of the (TIV) vibrations as well as compute the maximum value of the pressure oscillations.…”

Section: -Introductionmentioning

confidence: 99%

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: -Introductionmentioning

confidence: 99%

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

Awad

Parrondo

2023

Preprint

Self Cite

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“…If the vibration instability problem of the hydraulic control valve occurs, the pressure and flow rate of the system pipeline will not be guaranteed, and the safety of the pressure-resistant water compartment in the buoyancy adjustment system, and the submerged state of the submersible will be seriously affected [2,3]. Theoretical models were developed [4], the use of MATLAB/Simulink system control equations were nonlinearly solved. equations were solved nonlinearly, and it was obtained that the root cause of the valve vibration is the leakage of the valve seal.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics of Pilot-Operated Hydraulic Control Valves for Submersible Based on Improved Newmark- Integration Method

Li,

Zhang,

Lian

et al. 2023

IEEE Access

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Submersible is an important equipment for the development and utilization of marine resources. The pilot-operated hydraulic control valves have an extremely wide range of applications in the buoyancy adjustment system of submersibles. The existing hydraulic control valves have insufficient flow rate and pressure adjustment ability in a wide range of system pressures. A pilot-operated hydraulic control valve with a wide range of adjustable pressures, a high flow rate control accuracy, and anti-turbulence and cavitation is designed. A joint simulation method combining MATLAB/Simulink and UDF dynamic mesh is developed. The dynamic characteristics of the piping system and pilot-operated hydraulic control valve under different system inlet pressures are investigated by using the metric cellular automata technology and one-and threedimensional co-simulation platforms. The results of the joint simulation show that: the flow rate of the system stabilizes for a period at a system inlet pressure of 1.6 MPa, and the phenomena such as fluctuations and oscillations will occur after a period. To address this phenomenon, an improved Newmark-β integration method is proposed based on establishing a correct nonlinear model. The established model is solved in a longer time domain to obtain the nonlinear dynamic bifurcation behavior of the model. The stability of the pilot-operated hydraulic control valve is analyzed by displacement dynamic response diagrams, phase space trajectory diagrams, and bifurcation diagrams. A direction is provided for the applied research of nonlinear system bifurcation theory in self-operated valves.

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Turbine Inlet Valve’s Self-Excited Vibrations Risk the Safe Operation of Hydropower Plants
Awad
¹
,
Parrondo
²

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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Nonlinear dynamic performance of the turbine inlet valves in hydroelectric power plants

Cited by 3 publications

References 12 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

Nonlinear Dynamics of Pilot-Operated Hydraulic Control Valves for Submersible Based on Improved Newmark- Integration Method

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

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