Self-sustained oscillations in pipe systems with multiple deep side branches: Prediction and reduction by detuning

Tonon, Devis; Willems, J. F. H.; Hirschberg, Avraham

doi:10.1016/j.jsv.2011.07.024

Cited by 21 publications

(15 citation statements)

References 41 publications

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“…IV. The viscous damping 23 at the mouths of the sidebranch tubes is ignored in the present study. It is expected that such effect will reduce the sharpness of the resonance and affect the resonance frequencies.…”

Section: 18mentioning

confidence: 99%

Narrow sidebranch arrays for low frequency duct noise control

Tang

2012

The Journal of the Acoustical Society of America

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The present study investigates the sound transmission loss across a section of an infinitely long duct where one or more narrow sidebranch tubes are installed flushed with the duct wall. The finite-element method is used to compute the wave propagation characteristics, and a simplified theoretical analysis is carried out at the same time to explain the wave mechanism at frequencies of high sound reduction. Results show that the high sound transmission loss at a particular frequency is due to the concerted actions of three consecutive sidebranch tubes with the most upstream one in the resonant state. The expansion chamber effect of the setup also plays a role in enhancing sound attenuation at non-resonance frequencies. Broadband performance of the device can be greatly enhanced by appropriate arrangements of tube lengths and/or by coupling arrays on the two sides of the duct.

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Section: 18mentioning

confidence: 99%

Narrow sidebranch arrays for low frequency duct noise control

Tang

2012

The Journal of the Acoustical Society of America

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“…In the case of complex pipe geometries, e.g. multiple side-branches, it is also possible to make predictions on the effect of geometrical parameters, see Tonon et al (2011). For example Dequand et al (2003) studies the acoustic response of a 90-degree sharp However, it is not clear at the moment how to merge such acoustic models with the valve and reservoir equations.…”

Section: Complex Pipeline Geometry and Multi Device Installationmentioning

confidence: 99%

Dynamic behaviour of direct spring loaded pressure relief valves connected to inlet piping: IV review and recommendations

Hős

Champneys

Paul

et al. 2017

Journal of Loss Prevention in the Process Industries

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractRecent progress by a number of different groups and authors is reviewed on the stability properties of direct-spring pressure relief valves connected to pressure vessels with or without piping systems. Various different notions of stability and mechanisms for instability are revealed both in the case of gas and liquid service. It is stressed that it is not the valve itself that is stable or unstable, rather the harmful vibrations arise through interactions between the valve and its surroundings -the inlet piping, the reservoir, and any outlet piping. A distinction is drawn between underlying instability mechanisms and how these may be triggered during transient operations. The purpose of the work is to provide a coherent simplified account that will be of practical use for proposing new operational guidelines and mitigation strategies. Among these various mechanisms, oscillatory instability due to the interaction with a quarter-wave acoustic mode in the inlet piping is argued to be the most important to mitigate.

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“…For instance, rounding off the trailing edge of a rectangular cavity reduces the amplitude of the fluid dynamic oscillations in comparison with sharp edge (Ethembabaoglu, 1973). On the other hand, for fluid resonant oscillations in deep cavities and closed side branches, it was found that rounding the cavity edges would increase pressure pulsation rather than reduce it (Brugguman et al (1991), Tonon et al (2011)). Similar features have been reported for corrugated pipes (Nakiboğlu et al (2009 ), Nakiboğlu and Hirschberg (2010), Nakiboğlu et al (2012)).…”

Section: Rounding the Cavity Edgesmentioning

confidence: 99%

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

Bolduc

Elsayed

Ziada

2013

Volume 4: Fluid-Structure Interaction

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Gas flow over ducted cavities can excite strong acoustic resonances within the confined volumes housing the cavities. When the wavelength of the resonant acoustic modes is comparable to, or smaller than, the cavity dimensions, these modes are referred to as trapped acoustic modes. The excitation mechanism causing the resonance of these trapped modes in axisymmetric shallow cavities has been investigated experimentally in a series of papers by Aly & Ziada [1–3]. In this paper, the same experimental set-up is used to investigate the effect of the upstream edge geometry on the acoustic resonance of trapped modes. The investigated geometries include sharp and rounded cavity corners, chamfering the upstream edge, and spoilers of different types and sizes. Rounding off the cavity edges is found to increase the pulsation amplitude substantially, but the resonance lock-on range is delayed, i.e. it is shifted to higher flow velocities. Similarly, chamfering the upstream corner delays the onset of resonance, but does not increase its intensity. Spoilers, or vortex generators, added at the upstream edge have been found to be the most effective means to suppress the resonance. However, the minimum spoiler size which is needed to suppress the resonance increases as the cavity size becomes larger.

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Self-sustained oscillations in pipe systems with multiple deep side branches: Prediction and reduction by detuning

Cited by 21 publications

References 41 publications

Narrow sidebranch arrays for low frequency duct noise control

Narrow sidebranch arrays for low frequency duct noise control

Dynamic behaviour of direct spring loaded pressure relief valves connected to inlet piping: IV review and recommendations

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

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