Pressure pulsations in the turbine steam-admission path and their influence on the vibration state of the turbine control valves

Zaryankin, A. E.; Zroichikov, N. A.; Paramonov, A. N.; Noskov, V. V.; Grigor’ev, E. Yu.

doi:10.1134/s0040601512020176

Cited by 6 publications

(3 citation statements)

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“…The angle of the valve head (μ) is 100˚ while the diameter of the spindle (D1) is 0.02 m. The diameter (D2) and length (L) of the chamber are 0.06m and 0.088m, respectively. The lift of the spindle (h) is related to the valve opening ratio (β) via Equation (1). The walls and surfaces of the testing facility are treated as smooth, isothermal and stationary.…”

Section: Computational Domainmentioning

confidence: 99%

“…A large amount of the flow energy is dissipated and converted to vibrations and noise in the vicinity of the valve. The ability to predict how flow rate and valve opening condition may give rise to high frequency flow-induced vibration is of critical importance to the power industry; in order to be able to reduce or entirely eliminate instances of dynamic events which can lead to structural damage and failure in very short time frames [1]. Many such events have been reported to occur when the valves were partially open, resulting in violent vibrations of valve components such as stem, suspension elements, and valve seat.…”

Section: Introductionmentioning

confidence: 99%

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A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

Duan

Revell²,

Sinha³

et al. 2019

International Journal of Pressure Vessels and Piping

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There have been a number of significant power outages caused by unexpected levels of flowinduced vibration of valves in partially-open operating conditions and as such the understanding of this phenomena is critically important. On-site testing is normally expensive and inherently difficult given typical flow rates but while computational fluid dynamics (CFD) offers a feasible alternative, it demands careful use and analysis to capture the highly coupled physical phenomena present. This paper reports on the fluid flow around a spindle in a highpressure valve and related flow by means of 2D unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and the k-ω-SST turbulence model. Following a mesh sensitivity study, the measured force frequencies and shockwave patterns predicted around the valve head indicate a high level of agreement with experimental reference data. The unsteady flow is then assessed at various stages of valve-opening; conditions which are increasingly common in the context of power throttling to balance supply from more variable renewable energy sources. Although, the averaged force on the valve head reduces linearly with the lift of stem, the fluctuating component of the force rises by almost 50% when the valve opening changes from 25% to 50%. This quantity, significant in the identification of violent high-frequency vibration, is then observed to reduce steadily upon further opening. Spectral analysis and flow field data provide the basis for further insight with respect to the formation and evolution of a series of shock-wave/boundary-layer interactions along the valve head.

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Section: Computational Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

Duan

Revell²,

Sinha³

et al. 2019

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

show abstract

“…Therefore, reports of successful dampening of pressure pulsations by means of actively modifying the behavior of process media flow in ducts and pipes are of much value [3,14,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Line summary of approaches for improving vibrational reliability of thermomechanical equipment and its interconnecting pipelines at thermal power plant

Zaryankin¹,

Rogalev²,

Rogalev³

et al. 2014

ces

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A central problem in engineering of power-generating equipment, beside the quest for economy, is the problem of ensuring reliability of equipment and branched pipeline systems for circulation of process media. When analyzing causes of component failures in thermomechanical installations, flow control devices and pipelines, it should be noted that such failures most often result from dynamic loads on walls of these objects exposed to flowing media. Such loads are an immediate result of turbulent flow of the process medium. This turbulence is characterized by extremely non-uniform flow field and pressure pulsations of significant amplitude occurring in a broad band of frequencies. For that reason, this paper will be mainly concerned with the development and experimental studies of new approaches to dampening flow perturbations introduced by flow control devices, turbine stages, flow direction changes at pipeline bends, control valves of steam turbines etc. Findings are presented as specific examples showing the potential for a sharp reduction of dynamic loads on walls of various devices exposed to flowing medium. These involve both specially designed aerodynamic filters and direct action to modify flow behavior of the process medium in areas adjacent to walls. It is shown that the application of proposed pulsation dampener designs has the potential of twofold to threefold improvement in vibrational reliability of equipment and its interconnecting pipelines.

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Unsteady flow behavior of a steam turbine control valve in the choked condition: Field measurement, detached eddy simulation and acoustic modal analysis

Wang

Liu

2017

Applied Thermal Engineering

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Pressure pulsations in the turbine steam-admission path and their influence on the vibration state of the turbine control valves

Cited by 6 publications

References 0 publications

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

Line summary of approaches for improving vibrational reliability of thermomechanical equipment and its interconnecting pipelines at thermal power plant

Unsteady flow behavior of a steam turbine control valve in the choked condition: Field measurement, detached eddy simulation and acoustic modal analysis

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