Whistling of a pipe system with multiple side branches: Comparison with corrugated pipes

Tonon, Devis; Landry, Bjt; Belfroid, S.P.C.; Willems, Jfh Jan; Hofmans, Gcj Geert; Hirschberg, Avraham

doi:10.1016/j.jsv.2009.10.020

Cited by 48 publications

(45 citation statements)

References 33 publications

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“…3,28 Experiments on the localization of the region of sound production in corrugated pipes have shown that the contribution of each cavity is not the same. 8,12,13 It was demonstrated that the sound production is dominated by the cavities which are in the proximity of the acoustic pressure nodes of the standing wave along the main pipe. Considering the fundamental mode, there exist only two pressure nodes: one at the inlet and one at the outlet.…”

Section: Discussionmentioning

confidence: 99%

“…8,12 This implies that sound production is a local effect, which can be studied for a single cavity. Thus, one can try to describe the phenomenon by carrying out a numerical simulation of the flow within a single cavity instead of modeling the whole corrugated pipe.…”

Section: Numerical Methodologymentioning

confidence: 99%

“…Further increase of the flow velocity decreases the amplitude of pressure fluctuations. The Strouhal number, which corresponds to the maximum pressure fluctuation amplitude for a given acoustical mode, is called the peak-whistling Strouhal number 7,12 (Sr pÀw Wþr up ). The peak-whistling Strouhal number of a corrugated pipe is determined through a linear least square fit of consecutive excited acoustic modes.…”

Section: (Sr Crmentioning

confidence: 99%

“…10 A Large eddy simulation has been attempted by Popescu and Johansen, 11 but results seem to be in contradiction with the experimental studies. 8,12,13 In the present paper the physical modeling of this instrument is discussed. In the next section, an overview of the basic principles is given.…”

Section: Introductionmentioning

confidence: 99%

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Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

Nakiboglu

Rudenko

Hirschberg

2012

The Journal of the Acoustical Society of America

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When one swings a short corrugated pipe segment around one's head, it produces a musically interesting whistling sound. As a musical toy it is called a "Hummer" and as a musical instrument, the "Voice of the Dragon." The fluid dynamics aspects of the instrument are addressed, corresponding to the sound generation mechanism. Velocity profile measurements reveal that the turbulent velocity profile developed in a corrugated pipe differs notably from the one of a smooth pipe. This velocity profile appears to have a crucial effect both on the non-dimensional whistling frequency (Strouhal number) and on the amplitude of the pressure fluctuations. Using a numerical model based on incompressible flow simulations and vortex sound theory, excellent predictions of the whistling Strouhal numbers are achieved. The model does not provide an accurate prediction of the amplitude. In the second part of the paper the sound radiation from a Hummer is discussed. The acoustic measurements obtained in a semi-anechoic chamber are compared with a theoretical radiation model. Globally the instrument behaves as a rotating (Leslie) horn. The effects of Doppler shift, wall reflections, bending of the tube, non-constant rotational speed on the observed frequency, and amplitude are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Numerical Methodologymentioning

confidence: 99%

Section: (Sr Crmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

Nakiboglu

Rudenko

Hirschberg

2012

The Journal of the Acoustical Society of America

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“…[17][18][19][20] Corrugated pipes provide local stiffness while keeping its global flexibility. This unique characteristic makes corrugated pipes suitable for a broad range of industrial applications, e.g., ventilation systems, domestic appliances, heat exchangers, and offshore natural gas transportation systems.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic power generated by multiple compact axisymmetric cavities: Effect of hydrodynamic interference on the sound production

Nakiboglu

Hirschberg

2012

Physics of Fluids

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Aeroacoustic sound generation due to self-sustained oscillations by a series of compact axisymmetric cavities exposed to a grazing flow is studied both experimentally and numerically. The driving feedback is produced by the velocity fluctuations resulting from a coupling of vortex sheddings at the upstream cavity edges with acoustic standing waves in the coaxial pipe. When the cavities are separated sufficiently from each other, the whistling behavior of the complete system can be determined from the individual contribution of each cavity. When the cavities are placed close to each other there is a strong hydrodynamic interference between the cavities which affects both the peak amplitude attained during whistling and the corresponding Strouhal number. This hydrodynamic interference is captured successfully by the proposed numerical method.

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Controlling the Acoustic Resonance in a Corrugated Flow Pipe

Amielh

Anselmet

Jiang

et al. 2013

Fluid-Structure-Sound Interactions and Control

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A new experimental setup , aimed at investigating the coupling between the flow in a corrugated pipe, the acoustically generated flow oscillations and the emitted resulting noise is carried out. Hot-wire anemometry and microphone measurements are associated to characterize the flow. The flow response to the corrugation is shown to fit to the 6 th to 9 th acoustic modes of the pipe according to the flow rate. When low frequency acoustically generated oscillations interfere with this, one checks that they either significantly reduce the noise level or modify the peak frequencies. In addition, theoretical/numerical works are also performed, in order to provide an analytical framework describing the acoustical properties of such corrugated pipe flows.

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Whistling of a pipe system with multiple side branches: Comparison with corrugated pipes

Cited by 48 publications

References 33 publications

Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

Aeroacoustic power generated by multiple compact axisymmetric cavities: Effect of hydrodynamic interference on the sound production

Controlling the Acoustic Resonance in a Corrugated Flow Pipe

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