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Research Papers

Computational Fluid Dynamics-Based Numerical Analysis of Acoustic Attenuation and Flow Resistance Characteristics of Perforated Tube Silencers

[+] Author and Article Information
Chen Liu

School of Power and Energy Engineering,
Harbin Engineering University,
No. 145 Nantong Street, Nangang District,
Harbin, Heilongjiang 150001, China

Zhenlin Ji

School of Power and Energy Engineering,
Harbin Engineering University,
No. 145 Nantong Street, Nangang District,
Harbin, Heilongjiang 150001, China
e-mail: zhenlinji@yahoo.com

1Corresponding author.

Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received August 6, 2012; final manuscript received November 14, 2013; published online December 24, 2013. Assoc. Editor: Lonny Thompson.

J. Vib. Acoust 136(2), 021006 (Dec 24, 2013) (11 pages) Paper No: VIB-12-1223; doi: 10.1115/1.4026137 History: Received August 06, 2012; Revised November 14, 2013

The 3D time-domain computational fluid dynamics (CFD) approach is used to calculate the acoustic attenuation performance of perforated tube silencers without and with flow. For the crossflow perforated tube silencer and straight-through perforated tube silencers, the transmission loss predictions agree well with the experimental measurements available in the literature. Then, the 3D time-domain CFD approach is employed to investigate the effects of flow velocity and temperature on the acoustic attenuation performance of perforated tube silencers. The numerical results demonstrated that the transmission loss is increased at most frequencies for the crossflow perforated tube silencer as the air flow increases, while the air flow has little influence on the acoustic attenuation in the plane wave range and increases the acoustic attenuation at higher frequencies for the straight-through perforated tube silencers. Increasing the air temperature shifts the transmission loss curve to higher frequency and lowers the resonance peaks somewhat. The pressure drops of perforated tube silencers are predicted by performing the 3D steady flow computation using CFD. The pressure drop of the crossflow perforated tube silencer is much higher than those of the straight-through perforated tube silencer at the same flow conditions, and the pressure drop of the straight-through perforated tube silencer increases gradually as the porosity increases.

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References

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Figures

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Fig. 1

Crossflow perforated tube silencer

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Fig. 2

Straight-through perforated tube silencer

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Fig. 3

Scheme for transmission loss calculation of a silencer

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Fig. 4

(a) Time history of the pressure at upstream monitoring point with acoustic excitation, (b) time history of the pressure at upstream monitoring point without acoustic excitation, and (c) acoustic signals at upstream monitoring point in time-domain

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Fig. 5

(a) Time history of the pressure at downstream monitoring point with acoustic excitation, (b) time history of the pressure at downstream monitoring point without acoustic excitation, and (c) acoustic signals at downstream monitoring point in time-domain

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Fig. 6

(a) The incident sound pressure in the frequency-domain, and (b) the transmitted sound pressure in the frequency-domain

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Fig. 7

Scheme for pressure drop calculation of straight-through perforated tube silencer

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Fig. 8

Comparison of transmission loss results of crossflow perforated tube silencer (v = 0 m/s, T = 293 K)

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Fig. 9

Comparison of transmission loss results of crossflow perforated tube silencer (v = 17 m/s, T = 347 K)

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Fig. 10

Effect of flow velocity on transmission loss of crossflow perforated tube silencer (T = 347 K)

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Fig. 11

The location of profile A1 in crossflow perforated tube silencer

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Fig. 12

Velocity vectors on profile A1: (a) v = 17 m/s, T = 347 K and (b) v = 34 m/s, T = 347 K

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Fig. 13

Effect of air temperature on transmission loss of crossflow perforated tube silencer (v = 34 m/s)

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Fig. 14

Comparison of transmission loss results (M = 0.1, T = 288 K): (a) silencer S1, (b) silencer S2, and (c) silencer S3

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Fig. 15

Comparison of transmission loss results of silencer S1 (M = 0.2, T = 288 K)

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Fig. 16

Effects of flow velocity on transmission loss of straight-through perforated tube silencers (T = 347 K): (a) silencer S1, (b) silencer S2, and (c) silencer S3

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Fig. 17

The location of profile A2 in silencer S1

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Fig. 18

Velocity vectors on profile A2 for silencer S1: (a) v = 18.64 m/s, T = 347 K and (b) v = 37.28 m/s, T = 347 K

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Fig. 19

Effects of air temperature on transmission loss of straight-through perforated tube silencers (M = 0.1): (a) silencer S1, (b) silencer S2, and (c) silencer S3

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Fig. 20

Pressure loss results of crossflow perforated tube silencer (T = 293 K)

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Fig. 21

Comparison of pressure loss results of three straight-through perforated tube silencers (T = 293 K)

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Fig. 22

Contours of velocity magnitude for crossflow perforated tube silencer (v = 50 m/s, T = 293 K)

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Fig. 23

Contours of velocity magnitude for straight-through perforated tube silencers (v = 50 m/s, T = 293 K): (a) silencer S1, (b) silencer S2, and (c) silencer S3

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Fig. 24

Contours of turbulent kinetic energy for crossflow perforated tube silencer (v = 50 m/s, T = 293 K)

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Fig. 25

Contours of turbulent kinetic energy for straight-through perforated tube silencers (v = 50 m/s, T = 293 K): (a) silencer S1, (b) silencer S2, and (c) silencer S3

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