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

  • 제12권1호
  • /
  • Pages.42-47
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  • 2002
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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시로코 홴의 공력소음 발생에 관한 수치적 연구

A Numerical Study on the Generation of Aeroacoustic Sound from Sirocco Fans

  • 전완호 (LG전자 디지털 어플라이언스 연구소) ;
  • 백승조 (LG전자 어플라이언스 연구소) ;
  • 김창준 (LG전자 어플라이언스 연구소)
  • 발행 : 2002.01.01
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초록

Sirocco fans are widely used in HVAC and air conditioning systems, and the noise generated by these machines causes one of the most serious problems. In general, the sirocco fan noise is often dominated by tones at BPF(blade passage frequency) and broadband noise. However, only a few researches have been carried out on predicting the aeroacoustic noise because of the difficulty in obtaining detailed information about the flow field and casing effects on noise radiation. The objective of this study is to develop a prediction method for the unsteady flow field and the acoustic pressure field of a sirocco fan. We assume that the impeller rotates with a constant angular velocity and the flow field around the impeller is incompressible and inviscid. So, a discrete vortex method (DVM) is used to model the centrifugal fan and to calculate the flow field. The force of each element on the blade is calculated by the unsteady Bernoulli equation. Lowson\`s method is used to predict the acoustic source. Reasonable results are obtained not only fur the tonal noise but also far the amplitudes of the broadband noise. Acoustic pressure is proportional to (Ω)2.3, which is the similar value with the measured data.

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참고문헌

  1. Jeon, W. H., Lee. D. J., 2000, "Analysis of Flow and Sound field of Ducted Axial Fan," InterNoise 2000, pp. 1531-1534.
  2. 전완호, 정기훈, 이덕주, 2000, "덕트가 있는 축류 홴의 유동 및 음향장 해석," 유체기계저널, 제3권 2호, pp. 15-23.
  3. Jeon, W. H., Lee, D. J., 1999. "An Analysis of the Flow and Aerodynamic Acoustic Sources of a Centrifugal Impeller," Journal of Sound and Vibration, Vol. 222, No. 3, pp. 505-511 https://doi.org/10.1006/jsvi.1998.1983
  4. Jeon, W. H., Lee, D. J., 2000, "An Analysis of Generation and Radiation of Sound for a Centrifugal Fan." Seventh International Congress on Sound and Vibration. Germany, pp. 1235-1242.
  5. 김경호, 박계찬, 이승배, 1999, "시로코 홴 성능 및 공력소음 예측에 관한 연구," 유체기계저널, 제 2 권, 제 4 호, pp. 57-64.
  6. Lowson, M. V., "1965, The Sound Field for Singularities in Motion." Proc. R. Soc. London. Sei. A. 286, pp. 559-572. https://doi.org/10.1098/rspa.1965.0164
  7. Yamazaki, S., 1986. "An Experimentla Study on the Aerodynamic Performance of Multi-blade Blowers," 일본기계학회논문집, 제 52권, 제 484호, pp. 3987-3991.
  8. Weidemann, J., 1971, "Analysis of the Relations Between Acoustic and Aerodynamic Parameters for a Series of Dimensionally Similar Centrifugal Fan Rotors." NASA TT F-13,798.
  9. Neise, W., 1975. "Application of Similarity Laws to the Blade Passage Sound of Centrifugal Fans." Journal of Sound and Vibration, Vol. 43, No. 1, pp. 61-75. https://doi.org/10.1016/0022-460X(75)90205-9