Effect of Flow on Helmholtz Resonator Acoustics: A Three-Dimensional Computational Study vs. Experiments

Selamet, Emel; Selamet, Ahmet; Iqbal, Asif; Kim, Hyun-Su

doi:10.4271/2011-01-1521

Cited by 21 publications

(35 citation statements)

References 17 publications

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“…This is consistent with the experimental measurement. 27 Figure 3 shows the comparison of the present predictions and the results obtained by Selamet et al 27 under three different Mach numbers. It can be seen that good agreements are obtained in terms of the TL variation with forcing frequency.…”

Section: Model Validationmentioning

confidence: 63%

“…To evaluate the proposed model, validation studies are performed on a straight 2D duct with a symmetric Helmholtz resonator attached and the presence of a grazing flow. The results are then compared with the experimental measurements presented in the previous work by Selamet et al 27 The parameters and values in the computational cases correspond to those of the tested cases and the geometry in the experimental measurement. The interested frequency range is from 50 to 200 Hz.…”

Section: Model Validationmentioning

confidence: 99%

“…Helmholtz resonators can be designed into symmetric and asymmetric configurations. Selamet and his group members 13,[25][26][27] conducted a series of studies on circular resonators (either symmetric or asymmetric) via experimental measurements or theoretical/numerical simulations. It was worth noting that most of these studies, even when an asymmetric resonator was considered, were conducted, when there is no grazing mean flow.…”

Section: Introductionmentioning

confidence: 99%

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Numerical studies of transmission loss performances of asymmetric Helmholtz resonators in the presence of a grazing flow

Pan

Guan

2018

Journal of Low Frequency Noise, Vibration and Active Control

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As a typical noise-attenuating device, Helmholtz resonators are widely implemented in aero-engines and gas turbines to decrease the transmission of acoustic noise. However, an asymmetric Helmholtz resonator could be designed and implemented due to the limited space available in the engines. To examine and optimize the noise-attenuating performances of the asymmetric resonator, comparison studies are performed. For this, a two-dimensional frequency-domain model of a cylindrical duct with a grazing flow is developed. An asymmetric Helmholtz resonator is attached as a side branch. The model containing the linearized Navier-Stokes equations is validated first by comparing the predicted results with the experimental ones available in the literature. Further validation is conducted by comparing the results of an asymmetric resonator with the analytical ones available in the literature. The effects of (1) neck offset distance from the center of the resonator cavity denoted by e c =a s and (2) the grazing flow Mach number M u are evaluated. It is shown that as the grazing flow Mach number is increased, the resonant frequencies and the maximum transmission losses are dramatically varied for a given e c =a s. As e c =a s is increased from 0 to 0.5 and M u ! 0:1, the resonant frequencies and the maximum transmission losses are increased. However, when M u is lower than 0.07, i.e. M u 0:07, the transmission loss performances are almost unchanged with e c =a s increased. The optimum design of the asymmetric resonator is shown to give rise to the resonant frequency being shifted by 10% and 2-5 dB more transmission loss at higher Mach number. Finally, visualization of vortex shedding formed at the neck of the asymmetric resonator confirms that acoustical energy is transformed into kinetic energy and absorbed by the surrounding air. This study opens up a numerical design approach to optimize an asymmetric resonator.

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Section: Model Validationmentioning

confidence: 63%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical studies of transmission loss performances of asymmetric Helmholtz resonators in the presence of a grazing flow

Pan

Guan

2018

Journal of Low Frequency Noise, Vibration and Active Control

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“…One of the critical factors influencing their acoustic performance is the presence of mean flow. A recent study [4], for example, examines this effect for a HR with its neck oriented perpendicular to flow. The emphasis of the present study remains the flow effect as applied, however, to a different orientation of a ("charged") HR, where the silencer of [4] is now aligned parallel to the incident flow as illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Multidimensional time domain computations are performed to predict the acoustic behaviour of this HR. These predictions are then compared with experimental results on a flow-impedance tube setup, which is described in [4]. In the setup, pressure transducers are located at two upstream (referred to as locations 1 and 2 hereafter) and two downstream locations (3 and 4), 4 cm apart from each other, for capturing the pressure fluctuations which are then used to calculate the acoustic attenuation in terms of transmission loss.…”

mentioning

confidence: 99%

Acoustics of a Helmholtz Resonator Aligned Parallel with Flow: A Computational Study VS. Experiments

Selamet¹,

Selamet²,

Iqbal³

et al. 2013

IJMMM

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I. INTRODUCTIONA variety of analytical, computational, and experimental studies is available in literature to investigate the acoustic behaviour of HRs since they are extensively used in many applications, such as the breathing system of internal combustion engines and compressors [1]- [3]. One of the critical factors influencing their acoustic performance is the presence of mean flow. A recent study [4], for example, examines this effect for a HR with its neck oriented perpendicular to flow. The emphasis of the present study remains the flow effect as applied, however, to a different orientation of a ("charged") HR, where the silencer of [4] is now aligned parallel to the incident flow as illustrated in Fig. 1. Multidimensional time domain computations are performed to predict the acoustic behaviour of this HR. These predictions are then compared with experimental results on a flow-impedance tube setup, which is described in [4]. In the setup, pressure transducers are located at two upstream (referred to as locations 1 and 2 hereafter) and two downstream locations (3 and 4), 4 cm apart from each other, for capturing the pressure fluctuations which are then used to calculate the acoustic attenuation in terms of transmission loss.Following this Introduction, Section II briefly describes the solution method. Computational results and their comparison with experimental data are presented in Section III, followed by concluding remarks in Section IV. Manuscript

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Effects of Gap Width on Vibration Response of Aileron-Cabin-Model Due to Acoustic-Structure Coupling

Zhong

Ding

2023

Lecture Notes in Electrical Engineering

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Effect of Flow on Helmholtz Resonator Acoustics: A Three-Dimensional Computational Study vs. Experiments

Cited by 21 publications

References 17 publications

Numerical studies of transmission loss performances of asymmetric Helmholtz resonators in the presence of a grazing flow

Numerical studies of transmission loss performances of asymmetric Helmholtz resonators in the presence of a grazing flow

Acoustics of a Helmholtz Resonator Aligned Parallel with Flow: A Computational Study VS. Experiments

Effects of Gap Width on Vibration Response of Aileron-Cabin-Model Due to Acoustic-Structure Coupling

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