Fluid-Structure Interaction

Flowforce in a Safety Relief Valve Under Incompressible, Compressible, and Two-Phase Flow Conditions (PVP-2011-57896)

[+] Author and Article Information
Vasilios Kourakos

e-mail: kourakos@vki.ac.be

Patrick Rambaud

e-mail: rambaud@vki.ac.be

Jean-Marie Buchlin

e-mail: buchlin@vki.ac.be
von Karman Institute for Fluid Dynamics
Waterloose steenweg 72, B-1640
Sint-Genesius-Rode, Belgium

Saïd Chabane

Centre Technique des Industries Mécaniques
74 route de la Jonelière BP 82617
44326 Nantes Cedex 3, France
e-mail: said.chabane@cetim.fr

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 27, 2011; final manuscript received March 29, 2012; published online December 5, 2012. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 135(1), 011305 (Dec 05, 2012) (11 pages) Paper No: PVT-11-1159; doi: 10.1115/1.4006904 History: Received July 27, 2011; Revised March 29, 2012

The use of relief valves is crucial for the safety of power plants. Indeed, these valves, simple but robust in their design, provide the ultimate protection when all other safety systems are inadequate. This study is focused on valve opening characteristics which can be studied through the determination of flowforces applied on the valve disk. A spring-loaded safety relief valve (SRV) (1½ in. G 3 in.) and its transparent model are tested under static conditions. The spring is removed and the forces, exerted at the valve disk for different inlet pressures and lift positions, are measured in compressible, incompressible, and two-phase flows. Results indicate that even for relatively small qualities (i.e., 5–10%), two-phase mixtures approach compressible flow behavior (especially for the higher lifts) in terms of disk force. Additionally, an inverse flowforce of air and water is noticed above a certain value of valve lift. Numerical simulations with a commercial computation fluid dynamics (CFD) code are performed in a 2D axisymmetric model of the valve for validation purposes. The main motivation of these computations is to obtain the qualitative physical explanation of this phenomenon revealing the displacement of the sonic line which occurs in air flow simulations. Finally, the importance of precise adjustment of the valve ring (in the smallest valve opening) for its optimal use is stressed by quantitative analysis using CFD simulations.

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Fig. 1

Detailed view of Nozzle-Valve Disk Components of SRV

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Fig. 2

Different types of studies

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Fig. 3

Experimental installations for original valve study

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Fig. 4

Comparison transparent-original valve

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Fig. 5

Visualization in transparent SRV (axisymmetric flow)

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Fig. 6

Axisymmetric grid of original SRV for CFD computations

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Fig. 7

3D flowforce curves

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Fig. 8

Total pressure contours for water flow at Pset = 6 bars (0.6 MPa)

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Fig. 9

Experimental and numerical FP and F/Q2 ratios versus valve opening

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Fig. 10

Density contours for air flow at Pset = 6 bars (0.6 MPa). Solid white thick line indicates sonic position.

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Fig. 11

Relative position of valve seat and adjustment ring/15 (reference), 0, and 20 notches

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Fig. 12

Influence of adjustment ring location on disk flowforce for water flow

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Fig. 13

Experimental-CFD Flowforce for air and water at Pset = 3 bars (0.3 MPa)

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Fig. 14

Comparison of inverse flowforce position for different set pressures

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Fig. 15

Comparison of flowforce for air, water, and two-phase flow at Pset =3 bars (0.3 MPa)




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