Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)

  • 2000.11a
  • /
  • Pages.100-105
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  • 2000
  • /
  • 1598-2548(pISSN)
The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지

Analysis of Wake and Noise of a Fan in Finite Duct

유한관내에서 축류팬 후류 및 해석

  • 정기훈 (한국과학기술원 항공우주공학과 대학원) ;
  • 최한림 (한국과학기술원 항공우주공학과 대학원) ;
  • 나선욱 (ATES, CFD 사업부) ;
  • 전완호 (LG 전선 기계연구소 CAE T/G) ;
  • 이덕주 (한국과학기술원 항공우주공학과)
  • Published : 2000.11.16
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Abstract

The present work describes the prediction method for the unsteady flow field and the acoustic pressure field of a ducted axial fan. The prediction method is comprised of time-marching free-wake method, acoustic analogy. and the Helmholtz-Kirchhoff BEM. The predicted sound signal of a rotor is similar to the experiment one. We assume that the rotor rotates with a constant angular velocity and the flow field around the rotor is incompressible and inviscid. Then, a time-marching free-wake method is used to model the fan and to calculate the flow field. The force of each element on the blade is calculated by the unsteady Bernoulli equation. Lawson's method is used to predict the acoustic source. The newly developed Helmholtz-Kirchhoff BEM for thin body is used to calculate the sound field of the ducted fan. The ducted fan with 6 blades is analysed and the sound field around the duct is calculated.

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