Acoustic Wave Propagation in Low Mach Flow Pipe

Popescu, Mihaela; Johansen, Stein Tore

doi:10.2514/6.2008-63

Cited by 8 publications

(12 citation statements)

References 12 publications

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“…The wavelength of the corrugations, the pitch, has been a commonly used characteristic length (Binnie 1961;Crawford 1974;Nakamura & Fukamachi 1991;Serafin & Kojs 2005;Popescu & Johansen 2008). However, testing pipes with more marked differences between cavity width and pitch showed that the peak-whistling Strouhal number depends on the cavity width rather than on the pitch (Elliott 2005;Belfroid et al 2007;Kristiansen & Wiik 2007;Nakiboglu et al 2010;Tonon et al 2010).…”

Section: Definition Of Strouhal Number For Whistling Periodic Systemsmentioning

confidence: 95%

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On the whistling of corrugated pipes: effect of pipe length and flow profile

et al. 2011

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Whistling behaviour of two geometrically periodic systems, namely corrugated pipes and multiple side branch systems, is investigated both experimentally and numerically. Tests are performed on corrugated pipes with various lengths and cavity geometries. Experiments show that the peak-whistling Strouhal number, where the maximum amplitude in pressure fluctuations is registered, is independent of the pipe length. Experimentally, a decrease of the peak-whistling Strouhal number by a factor of two is observed with increasing confinement ratio, i.e. the ratio of pipe diameter to cavity width. A numerical methodology that combines incompressible flow simulations with vortex sound theory is proposed to estimate the acoustic source power in periodic systems. The methodology successfully predicts the Strouhal number ranges of acoustic energy production/absorption and the nonlinear saturation mechanism responsible for the stabilization of the limit cycle oscillation. The methodology predicts peak-whistling Strouhal numbers in agreement with experiments and explains the dependence of the peak-whistling Strouhal number on the confinement ratio. Combined with an energy balance, the proposed methodology is used to estimate the acoustic fluctuation amplitudes.

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Section: Definition Of Strouhal Number For Whistling Periodic Systemsmentioning

confidence: 95%

“…Though there is an extensive literature on corrugated pipes, in many instances it is limited to short pipe segments (Binnie 1960(Binnie , 1961Crawford 1974;Cadwell 1994;Elliott 2005;Popescu & Johansen 2008). Ziada & Bühlmann (1991) investigated long corrugated pipes with water flow.…”

Section: Effect Of Pipe Length On the Whistling Behaviour Of Periodicmentioning

confidence: 98%

On the whistling of corrugated pipes: effect of pipe length and flow profile

et al. 2011

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“…3 is used to perform the simulation since whistling behavior is a local effect and thus, the interaction between cavities are assumed neglected. As it is noted that turbulence modeling such as LES predicts [6], [7] the resonance frequencies reasonably well compared to U fL Sr C measurements. The working fluid used is confined to air at 15 o C.…”

Section: Methodsmentioning

confidence: 63%

Effect of Corrugated Pipe Bending on Internal Flow Induced Acoustics

King

Leong²,

Zhang

et al. 2017

IJMERR

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Internal flow induced acoustics is commonly noticed in corrugated pipes that provide both flexibility and strength in offshore flexible riser system. This phenomenon is commonly known as whistling when flow passes through the corrugated pipe at high pressure and high velocity. This paper evaluates the effect of corrugated pipe bending on the whistling behavior using 2D numerical simulation. It is found that the bending angle will have an effect on the peak-whistling Strouhal number (Sr p-w ). By incorporating the bending effect = 360 360 − in characteristic dimension, such that ( + ) rather than (W + r up ) which was proposed in literature resulted in smaller variation of Strouhal Number, Sr p-w . Hence, provide more accurate prediction of the phenomena and further enhance the practicality of the modified characteristics length in predicting the peak whistling Strouhal Number.

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“…Using the model and grid presented above, Popescu and Johansen [21] showed that for cavity flows the maximum shear layer instability is found in the regions with maximum acoustic pressure variations. This indicates how the fluid system is influenced by the acoustic subsystem.…”

Section: Flow In a Corrugated Pipementioning

confidence: 99%

“…For the corrugated pipe, the instability of the shear layer is strongly influenced by the pipe internal acoustics (Popescu and Johansen [21]). In this case, the driving force (acoustic pressure) in the cavity has the natural frequency of the pipe.…”

Section: Model For Pressure In a Corrugated Pipementioning

confidence: 99%

Flow-Induced Acoustics in Corrugated Pipes

Popescu

Johansen

Shyy

2011

Commun. comput. phys.

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When gas flows through corrugated pipes, pressure waves interacting with vortex shedding can produce distinct tonal noise and structural vibration. Based on established observations, a model is proposed which couples an acoustic pipe and self-excited oscillations with vortex shedding over the corrugation cavities. In the model, the acoustic response of the corrugated pipe is simulated by connecting the lossless medium moving with a constant velocity with a source based on a discrete distribution of van der Pol oscillators arranged along the pipe. Our time accurate solutions exhibit dynamic behavior consistent with that experimentally observed, including the lock-in frequency of vortex shedding, standing waves and the onset fluid velocity capable of generating the lock-in.

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Acoustic Wave Propagation in Low Mach Flow Pipe

Cited by 8 publications

References 12 publications

On the whistling of corrugated pipes: effect of pipe length and flow profile

On the whistling of corrugated pipes: effect of pipe length and flow profile

Effect of Corrugated Pipe Bending on Internal Flow Induced Acoustics

Flow-Induced Acoustics in Corrugated Pipes

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