유체기계공업학회:학술대회논문집

Korean Society for Fluid machinery (한국유체기계학회)
권호 표지

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

청소기용 터보홴의 공력소음 발생에 관한 수치적 연구

  • 전완호 (LG 전자 디지털 어플라이언스 연구소) ;
  • 김창준 (LG 전자 디지털 어플라이언스 연구소) ;
  • 류호선 (LG 전자 디지털 어플라이언스 연구소)
  • Published : 2001.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

A new method to calculate the aeroacoustic pressure of a centrifugal fan was developed The fan consists of an impeller, diffuser and circular casing. Due to the high rotating velocity and the small gap between the impeller and diffuser, the centrifugal fan makes very high noise level at BPF and its harmonic frequencies. The aeroacoustic pressure is calculated acoustic analogy In this paper, only dipole term is considered in the equation. The acoustics generated by moving impeller and stationary diffuser is calculated separately. The unsteady flow field data is calculated by the vortex method The predicted acoustic pressure agrees very well to the measured data. The difference of the two is smaller than 3dBA.

Keywords