Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Effects of Fluid Velocity on Acoustic Transmission Loss of Simple Expansion Chamber

유동속도가 단순확장관 음향투과손실에 미치는 영향 해석

  • Kwon, Jin (Graduate School of Mechanical Engineering, Pusan National University) ;
  • Jeong, Weui-Bong (School of Mechanical Engineering, Pusan National University) ;
  • Hong, Chin-Suk (School of Mechanical Engineering, Ulsan College)
  • Received : 2012.08.14
  • Accepted : 2012.09.24
  • Published : 2012.10.20
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Abstract

Acoustic power transmission loss(TL) is an important performance of the muffler system. TL will be affected by the velocity of the fluid in duct since acoustic pressure varies according to the fluid velocity. In this paper, two kinds of fluid model, potential flow and turbulent flow, for the fluid flowing in simple expansion chamber are considered. The effects of their two fluid models in acoustic TL are investigated for the straight and L-shaped simple expansion chamber. In higher frequency range, the characteristics of TL of the two fluid models show different results. The variation of TL according to the fluid velocity is shown more distinctly when turbulence model is used. Turbulent flow model should be used to obtain better estimation of acoustic TL in higher frequency range.

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References

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