Passive control of flow-excited acoustic resonance in rectangular cavities using upstream mounted blocks

Shaaban, Mahmoud; Mohany, Atef

doi:10.1007/s00348-015-1908-8

Cited by 22 publications

(5 citation statements)

References 21 publications

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“…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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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: 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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“…[10][11][12] Noise control of the landing gear and bay noise is an important research area in the aeroacoustic studies, and to date, a few approaches have been proposed to attenuate the landing gear or the bay noise (e.g. solid/ perforated fairings 13,14 and air curtain [15][16][17] for the landing gear noise control, leading-edge spoiler [18][19][20][21] and fluid injection 22,23 for the cavity noise control). However, these techniques have not yet been tested to suppress the coupling noise of the landing gear and the bay.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler

Zhao

Liang

Yue

et al. 2019

Advances in Mechanical Engineering

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When the aircraft opens the bay door to let the landing gear either drop or retract, the incoming flow will result in a significant amount of coupling noise from the bay and the landing gear. Here, an experimental study was reported to characterise the acoustic performance and flow field at low subsonic speeds. Also, we examined a passive control method leading-edge chevron spoiler to suppress the noise. The experiment was performed in a low-speed aeroacoustic wind, the bay was simplified as a rectangular cavity and the spoiler was mounted to the leading edge. Both acoustic and aerodynamic measurements were performed through two microphone arrays, pressure transducers and particle image velocimetry. It was found that installation of the landing gear model can attenuate cavity oscillation noise to some extent by disturbing the shear layer of the cavity leading edge. Moreover, acoustic measurement confirmed the noise control when the spoiler was used. In addition, a parametric study on the effects of chevron topology was performed, and an optimised value was found for each parameter. From the aerodynamic measurement, the noise reduction was explained from the perspective of fluid dynamics. It was observed that installation of the chevron can raise the leading-edge shear layer and break up the large-scale vortices, thereby controlling the Rossiter mode noise and the landing gear model noise at certain frequencies.

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“…Akış ile akustik alan arasındaki ilişkinin incelendiği bir başka araştırma konusu ise pasif kontrol teknikleridir. Bu kontrol tekniklerinden bazıları; kavite ön duvarı öncesine konulan cisim [12], arka duvara yarı eğim verilmesi [13,14] ya da tam eğim verilmesi [15] ya da kavite ön duvar yakınına farklı yarıçaplara sahip silindirik cisim konularak [16] sağlanabilmektedir. Shaaban ve Mohany [12] tarafından kavite önüne yerleştirilen küt cisim M ∞ = 0,45 olarak tanımlanmış giriş hızı için akustik SPL değerinin 30dB artmasına neden olmuştur.…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…Bu kontrol tekniklerinden bazıları; kavite ön duvarı öncesine konulan cisim [12], arka duvara yarı eğim verilmesi [13,14] ya da tam eğim verilmesi [15] ya da kavite ön duvar yakınına farklı yarıçaplara sahip silindirik cisim konularak [16] sağlanabilmektedir. Shaaban ve Mohany [12] tarafından kavite önüne yerleştirilen küt cisim M ∞ = 0,45 olarak tanımlanmış giriş hızı için akustik SPL değerinin 30dB artmasına neden olmuştur. Pey ve Chua [13] ile Pey ve diğerleri [14], kavite arka duvarının 0,25 ve 0,5 katında 3 farklı açı için yarım eğimli altı farklı duvar konfigürasyonu denemişlerdir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Zamana Bağli Sikiştirilamaz Kavi̇te Akişinin Aeroakusti̇k Anali̇zi̇

Zafer¹,

Çoşgun²

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Passive control of flow-excited acoustic resonance in rectangular cavities using upstream mounted blocks

Cited by 22 publications

References 21 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

Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler

Zamana Bağli Sikiştirilamaz Kavi̇te Akişinin Aeroakusti̇k Anali̇zi̇

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