Flow-induced acoustic resonance at the mouth of one or two side branches

Okuyama, Keita; Tamura, Akinori; Takahashi, Shirō; Ohtsuka, Masaya; Tsubaki, Motonari

doi:10.1016/j.nucengdes.2011.07.036

Cited by 14 publications

(8 citation statements)

References 3 publications

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“…Our simulation results show that the mean flow velocity in the main pipe v affects the speed of the phase trajectory approaching the limit cycle as well as the shape of the limit cycle. We conclude that the mean flow velocity v in the main pipe should be within the nonlinear damping force system of SEV system equation (12) and positively correlated with μ. e length of the closed side branch and the acoustic velocity of the fluid determine the frequency of acoustic resonance (equation ( 7)), so the length of the branch and the acoustic velocity determine the ω 0 in equation (12).…”

Section: Self-excited Vibration Characteristics Of Acousticmentioning

confidence: 77%

See 1 more Smart Citation

Numerical Study on Acoustic Resonance Excitation in Closed Side Branch Pipeline Conveying Natural Gas

Jiang

Zhang

Duan

et al. 2020

Shock and Vibration

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Flow-induced acoustic resonance in the closed side branch of a natural gas pipeline can cause intensive vibration which threatens the safe operation of the pipeline. Accurately modeling this excitation process is necessary for a workable understanding of the genetic mechanism to resolve this problem. A realizable k-ε Delayed Detached Eddy Simulation (DDES) model was conducted in this study to numerically simulate the acoustic resonance problem. The model is shown to accurately capture the acoustic resonance phenomenon and self-excited vibration characteristics with low calculation cost. The pressure pulsation component of the acoustic resonance frequency is gradually amplified and transformed into a narrowband dominant frequency in the process of acoustic resonance excitation, forming a so-called “frequency lock-in phenomenon.” The gas is pressed into and out of the branch in sinusoidal mode during excitation. The first-order frequency, single vortex moves at the branch inlet following the same pattern. A quarter wavelength steady standing wave forms in the branch. The mechanism and characteristics presented in this paper may provide guidelines for developing new excitation suppression methods.

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Section: Self-excited Vibration Characteristics Of Acousticmentioning

confidence: 77%

“…ere is substantial practical importance in accurately, comprehensively understanding the mechanism of acoustic resonance and the most effective approaches to suppressing it [7][8][9][10][11][12]. e essential mechanism of acoustic resonance in the closed side branch is the coupling effect of the flow field and sound field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Acoustic Resonance Excitation in Closed Side Branch Pipeline Conveying Natural Gas

Jiang

Zhang

Duan

et al. 2020

Shock and Vibration

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show abstract

“…This complexity has been confirmed by acoustic measurements of Ziada & Bühlmann (1992), Okuyama et al . (2012) and Tonon, Willems & Hirschberg (2011 b ). The excited acoustic pulsations would not only be trapped inside the cavities, but also propagate outside along the main duct.…”

Section: Problem Formulation and Acoustic Measurementmentioning

confidence: 99%

Flow–acoustic resonance mechanism in tandem deep cavities coupled with acoustic eigenmodes in turbulent shear layers

Wang,

Jia,

et al. 2024

J. Fluid Mech.

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This study presents the interplay of flow and acoustics within tandem deep cavities, focusing on the resonance mechanism occurring between turbulent shear layers and acoustic eigenmodes. The arrangement inside the tandem deep cavities includes both close and remote configurations. A combined fully coupled and decoupled aeroacoustic simulation strategy was devised. Employing an advanced high-order spectral/hp element method in conjunction with implicit large eddy simulation, the nonlinear compressible Navier–Stokes equations were solved to acquire internal flow–acoustic resonant field. In parallel, the linearized Navier–Stokes equations were tackled to determine coherent shear layer perturbations with external acoustic forcing. Based on acoustic measurements, the mainstream Reynolds number approaches approximately $R{e_{in}} = {O}({10^5})$ , where we identified the presence of frequency lock-in and a resonance range. Aeroacoustic noise sources were examined by implementing spectral proper orthogonal decomposition to decompose the pressure fields into hydrodynamic and acoustic components. As feedback intensified, the flow characteristics by the acoustic forcing effect and the flow-interactive effect were categorized according to the development of concurrent turbulent shear layers. Subsequently, the alternating and synchronous behaviours of concurrent shear layers resonated with the out-of-phase and in-phase acoustic eigenmodes were identified, and the corresponding large-scale counter-rotating vortex pairs and co-rotating vortex structures at the cavity entrances were extracted. The acoustic power generated by the Coriolis force was calculated using Howe's vortex-sound analogy, and the aeroacoustic energy transfer mechanism between large-scale shear layer vortices with acoustic eigenmodes was further explored. Finally, a linear response of coherent perturbations of the concurrent shear layers by external acoustic forcing was established. The amplification of flow in the streamwise direction toward the main duct led to the formation of coherent vortex structures, accompanied by separation bubbles into the main duct.

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“…Tonon et al [17] discussed the flow-induced pulsation in a resonant pipe network with closed branches, and proposed a single-mode model for predicting self-sustained oscillation. Okuyama et al [18] conducted several air flow experiments at room temperature and pressure to study the effects of geometric parameters and flow parameters on general acoustic resonance. Xiao et al [19] experimentally studied the effects of branch length and edge geometry on the acoustic resonance characteristics of closed side branches.…”

Section: Introductionmentioning

confidence: 99%

Cause analysis of pipeline vibration in natural gas station

Jia

Kong

et al. 2021

E3S Web Conf.

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Natural gas station is an important part of the whole natural gas pipeline transmission system, in which the pipeline vibration is a hidden danger that cannot be ignored for the safe operation of the station. In view of the severe vibration of the pipeline in a natural gas station of an enterprise, the vibration acceleration sensors are used to test the vibration of each measuring point under different working conditions, and then the three-dimensional finite element model of the pipeline is established by using numerical simulation software to study its structural characteristics and gas column characteristics. Through the analysis of field test results and simulation results, it is found that there are two main vibration frequencies in the pipeline: 116.75 Hz and 123.0 Hz. The former is caused by the resonance between the gas column frequency and the natural frequency in pipe B; The latter is due to the impact of the gas column force in pipe A on pipe B.

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Flow-induced acoustic resonance at the mouth of one or two side branches

Cited by 14 publications

References 3 publications

Numerical Study on Acoustic Resonance Excitation in Closed Side Branch Pipeline Conveying Natural Gas

Numerical Study on Acoustic Resonance Excitation in Closed Side Branch Pipeline Conveying Natural Gas

Flow–acoustic resonance mechanism in tandem deep cavities coupled with acoustic eigenmodes in turbulent shear layers

Cause analysis of pipeline vibration in natural gas station

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