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TECHNICAL PAPERS

CFD Simulations and Experiments of Flow Fluctuations Around a Steam Control Valve

[+] Author and Article Information
Ryo Morita, Fumio Inada

CRIEPI

Michitsugu Mori, Kenichi Tezuka

TEPCO

Yoshinobu Tsujimoto

Osaka Univ.

J. Fluids Eng 129(1), 48-54 (Jun 11, 2006) (7 pages) doi:10.1115/1.2375123 History: Received July 26, 2005; Revised June 11, 2006

Under certain opening conditions (partial opening) of a steam control valve, the piping system in a power plant occasionally experiences large vibrations. To understand the valve instability that is responsible for such vibrations, detailed experiments and CFD calculations were performed. As a result of these investigations, it was found that under the middle-opening (partial opening) condition, a complex three-dimensional (3D) flow structure (valve-attached flow) sets up in the valve region leading to a high pressure region on a part of the valve body. As this region rotates circumferentially, it causes a cyclic asymmetric side load on the valve body, which is considered to be the cause of the vibrations.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of steam control valve

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Figure 2

Outline of experimental apparatus

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Figure 3

Details of a valve and a valve seat, and points of pressure measurement

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Figure 4

Time history of wall pressure on valve (A1-A4) and valve seat (B1-B4) (inlet pressure: 0.5MPa, arrows show the propagating direction)

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Figure 5

FFT analysis of pressure history (inlet pressure: 0.5MPa)

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Figure 6

Comparison of pressure rotation pattern (inlet pressure: 0.5MPa)

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Figure 7

Mach contour around a sphere (Mach number=2.0)

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Figure 8

Detached shock position versus inlet Mach number

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Figure 9

Strouhal number of Karman vortex versus Reynolds number

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Figure 10

Bird’s view of computational mesh

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Figure 11

Comparison between exp. and CFD (inlet pressure: 0.5MPa)

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Figure 12

RMS amplitude of pressure fluctuations

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Figure 13

Static pressure distribution and velocity vector (CFD)

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Figure 14

Time history of pressure distribution and velocity vector (CFD, Lift: 1.6mm (OR: 0.0325), x=0.033m section)

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Figure 15

Lissajous figure of side load (CFD)

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