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TECHNICAL PAPERS

Aerodynamic Torque of a Butterfly Valve—Influence of an Elbow on the Time-Mean and Instantaneous Aerodynamic Torque

[+] Author and Article Information
F. Danbon, C. Solliec

Ecole des Mines de Nantes, Département Systèmes, Energétiques et Environnement, Division Dynamique, des Fluides et Procédés, 4, rue A. Kastler, B. P. 20 722, F 44 307 Nantes, France

J. Fluids Eng 122(2), 337-344 (Feb 16, 2000) (8 pages) doi:10.1115/1.483262 History: Received October 08, 1999; Revised February 16, 2000
Copyright © 2000 by ASME
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References

Figures

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Flow structure downstream of an elbow
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Root mean square of the torque coefficient according to the spacing x/D and to the valve angle α
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Power spectrum of the torque for α=0 deg at different distances x/D
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Power spectrum of the torque for α=30 deg at different distances x/D
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Time history of the torque coefficient in presence of an elbow located at x/D=1 to 8 and in the straight pipe configuration, α=30 deg
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Time history of the torque coefficient in presence of an elbow located at x/D=1 to 8 and in the straight pipe configuration, α=0 deg
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Comparison between time-mean torque coefficients CTP and CTD for different opening angles in the straight pipe configuration (uncertainties in CT=2 percent and in α=±1 deg)
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Influence of the elbow on the time-mean torque coefficient CTP at x/D=1 (uncertainties in CTP=±2 deg and in α=±1 deg)
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Time-mean torque coefficient as a function of the valve disk angle (uncertainty in T=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity profiles in the median horizontal plane-elbow configuration (Vd=40 m/s, α=30 deg, uncertainty in U=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity profiles in the median horizontal plane-straight pipe configuration (Vd=40 m/s, α=30 deg, uncertainty in U=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity profiles in the median horizontal plane-elbow configuration (Vd=40 m/s, α=0 deg, uncertainty in U=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity profiles in the median vertical plane-elbow configuration (Vd=40 m/s, α=0 deg, uncertainty in U=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity profiles in the median horizontal plane-elbow configuration (Vd=40 m/s, uncertainty in U=±2 percent)
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Velocity and turbulence intensity profiles in the median vertical plane-elbow configuration (Vd=40 m/s, uncertainty in U=±2 percent)
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Velocity and turbulence intensity profiles in the median horizontal plane-straight configuration (Vd=40 m/s, α=0 deg, uncertainty in U=±2 percent and in α=±1 deg)
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Velocity and turbulence intensity in the median horizontal plane-straight pipe configuration (Vd=40 m/s, uncertainty in U=±2 percent)
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Pressure taps location and cross section of the valve
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Photography of the valve model (1/6) with its pressure taps and scanners
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Schematic view of the test bench and nomenclature
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Forces acting on a butterfly valve

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