Noise Caused by Cavitating Butterfly and Monovar Valves

Hassis, Hédi

doi:10.1006/jsvi.1999.2254

Cited by 24 publications

(16 citation statements)

References 1 publication

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“…Dans notre cas, l'onde est un pic de pression émis par l'excitatrice et la distance est celle entre les capteurs. Cette méthode très simple s'est avé-rée très efficace, et si elle n'a pas permis, pour des raisons de matériel (4), de déterminer avec précision la vitesse en (2) Elle est même plus marquée en régime non cavitant. Il semble que le maximum est plutôt dû à la turbulence.…”

Section: • Les Moyens Et Les Méthodesunclassified

Etude hydroacoustique d'une vanne papillon en régime cavitant

Boyer¹,

Lauro²

1998

La Houille Blanche

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Section: • Les Moyens Et Les Méthodesunclassified

Etude hydroacoustique d'une vanne papillon en régime cavitant

Boyer¹,

Lauro²

1998

La Houille Blanche

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“…The review article of Reethof (1978) concerning noise induced by turbulence gives a good overview of the physical mechanism and the technical concerns. However, few studies involve the problematic nature of cavitation and mainly focus on noise generation, see Testud et al (2007) and Hassis (1999); in their study of cavitation noise induced by single-hole and multi-hole orifices in pipes, Testud et al (2007) observed eigenmodes in a domain bounded by the cavitating orifice and a valve containing air pockets. The air pockets and the vapor cavities were suspected to reflect the acoustic waves.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the fluctuations were confined between those two reflective boundaries and eigenmodes have been observed in this restricted domain of the hydraulic circuit. In his experimental research, Hassis (1999) investigated the noise induced by a cavitating valve. His analysis included the effect of the vapor cavity on the pressure waves.…”

Section: Introductionmentioning

confidence: 99%

Cavitation influence on hydroacoustic resonance in pipe

Ruchonnet

Alligné

Nicolet³

et al. 2012

Journal of Fluids and Structures

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a b s t r a c tIn pipe systems, pressure and flow fluctuations below cutoff frequency propagate as plane waves along pipes. Depending on the pipe length and propagation velocity, resonance leading to high amplitude pressure fluctuation may occur. At low pressure, cavitation is an important source of fluctuation. Beside its active role in the mechanism of noise generation, the cavitation reflects partially the incoming plane waves. This may modify the values of the eigenfrequencies of the system consisting of the pipe, the contained fluid and the vapor cavity. The influence of cavitation is experimentally investigated in a hydroacoustic resonator: a straight pipe connecting two tanks. At three quarters of the pipe length, a bluff body is placed cross flow to generate periodic vortex wake cavitation in a limited section of the pipe. The analysis of the wall pressure measurements along the hydroacoustic resonator results is performed with the help of a one-dimensional transient model of the pipe including the compliance of the cavities created in the wake of the bluff body. The results of the numerical simulations enable the determination of both the eigenvalues within the resulting system of equations and the mode shape of the pressure fluctuations corresponding to the experimental results.

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“…Since Eq. (16) utilizes reference files that specify the static valve location in the aironly (CTVa) and water-only (CTV 1 ) conditions, when the valve location moves under the flow conditions (CTV), it appears that the valve location has a large void fraction (all red).…”

Section: Experimental Observationsmentioning

confidence: 99%

“…Acoustic signatures have been used to identify cavitation from butterfly valves [1,2], but the understanding of the cavitation field could be improved through improved visualization. Chern et a!.…”

Section: Introductionmentioning

confidence: 99%

Cavitation From a Butterfly Valve: Comparing 3D Simulations to 3D X-Ray Computed Tomography Flow Visualization

Brett¹,

Riveland²,

Jensen

et al. 2011

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora

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Flow control valves may experience localized cavitation when the local static pressure drops to the liquid vapor pressure. Localized damage to the valve and surrounding area can occur when the vapor cavity collapses. Valve designs that reduce cavitation are based on empirical evidence and accumulated experience, but there are still considerable cavitation problems in industry. Valve designers may use computational fluid dynamics (CFD) to simulate cavitation in flow control valves, but model validation is challenging because there are limited data of local cavitation from the valve surface. Typically, the intensity of cavitation in a control valve is inferred from measurements of observable side effects of cavitation such as valve noise, vibration, or damage to the valve assembly. Such an indirect approach to characterizing cavitation yields little information about the location, degree, and extent of the cavitation flow field that can be used in CFD validation studies. This study uses 3D X-ray computed tomography (CT) imaging to visualize cavitation from a 5.1 cm diameter butterfly valve and compares the resulting vapor cloud to that predicted by CFD simulations. Qualitative comparisons reveal that the resulting cavitation structures are captured by the simulations when a small amount of non-condensable gas is introduced into the fluid and the simulations are completed in a transient mode. Proceedings of the ASME-JSME-KSME ABSTRACT Flow control valves may experience localized cavitation when the local static pressure drops to the liquid vapor pressure. Localized damage to the valve and surrounding area can occur when the vapor cavity collapses. Valve designs that reduce cavitation are based on empirical evidence and accumulated experience, but there are still considerable cavitation problems in industry. Valve designers may use computational fluid dynamics (CFD) to simulate cavitation in flow control valves, but model validation is challenging because there are limited data of local cavitation from the valve surface. Typically, the intensity of cavitation in a control valve is inferred from measurements of observable side effects of cavitation such as valve noise, vibration, or damage to the valve assembly. Such an indirect approach to characterizing cavitation yields little information about the location, degree, and extent of the cavitation flow field that can be used in CFD validation studies. This study uses 3D X-ray computed tomography (CT) imaging to visualize cavitation from a 5.1 em diameter butterfly valve and compares the resulting vapor cloud to that predicted by CFD simulations. Qualitative comparisons reveal that the resulting cavitation structures are captured by the simulations when a small amount of noncondensable gas is introduced into the fluid and the simulations are completed in a transient mode.

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Noise Caused by Cavitating Butterfly and Monovar Valves

Cited by 24 publications

References 1 publication

Etude hydroacoustique d'une vanne papillon en régime cavitant

Etude hydroacoustique d'une vanne papillon en régime cavitant

Cavitation influence on hydroacoustic resonance in pipe

Cavitation From a Butterfly Valve: Comparing 3D Simulations to 3D X-Ray Computed Tomography Flow Visualization

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