Modification of a Steam Valve Diffuser for Enhanced Full Load and Part Load Operation Using Numerical Methods

Domnick, Clemens; Benra, Friedrich-Karl; Brillert, Dieter; Musch, Christian

doi:10.3311/ppme.9041

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…In particular, the vibration became self-excited once the amplitude was sufficiently large because of the strong coupling of the flow instability and stem vibration in this scenario. Based on CFD investigations, Domnick et al [19][20][21][22][23] identified that where the jet flow attached to the valve seat there was a sudden drop in the flow induced vibration. They related the observed re-attachment to the Coanda effect and as such, they suggested that the curvature of the valve seat should be small in order to increase the possibility for this phenomenon to manifest.…”

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

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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: 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

“…The former involves the study of the governing equations of the valve -usually in a linearised form -around its equilibrium positions [2], while the latter deals with more complicated, generally system-level issues [3]. In this paper a dynamic instability caused by the acoustic coupling between the valve and the straight upstream piping is investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Disc Geometry on the Dynamic Stability of Direct Spring Operated Pressure Relief Valves

Erdődi¹,

Hős²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The most important parameter of a direct spring operated pressure relief valve is its capacity, which is the rated flow through the valve under conditions given by the corresponding industrial standard. There are several phenomena due to which dynamic instabilities may arise in the system, leading to dangerous oscillations and reduced flow rate. One of the causes of these instabilities is the acoustic coupling of the valve with its upstream piping, the mathematical background of which has already been thoroughly investigated by the researchers at our department. As a continuation of that work, this paper focuses on the engineering applications by proposing various valve disc geometries based on preliminary measurement results, and evaluating their dynamic stability performance in a wide range of parameters. Steady-state CFD computations were performed to determine the mass flow rate and force characteristics of the various valve discs. Through these quantities, the behaviour of each geometry was implemented into our one-dimensional coupled gas dynamical solver, which resolves the pipe dynamics using the one-dimensional continuity-, momentum-and energy equations. The valve itself is modelled as a one degree-of-freedom oscillator. Finally, the stability maps of each geometries were calculated using the gas dynamical model and it was shown that the shape of the fluid force function does indeed have a significant effect on the stable operating range. 7695

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Experimental study of the hydrodynamics of a supersonic steam jet impinged on a wall in vertical and oblique orientations

et al. 2021

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Modification of a Steam Valve Diffuser for Enhanced Full Load and Part Load Operation Using Numerical Methods

Cited by 6 publications

References 15 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

Effect of Disc Geometry on the Dynamic Stability of Direct Spring Operated Pressure Relief Valves

Experimental study of the hydrodynamics of a supersonic steam jet impinged on a wall in vertical and oblique orientations

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