진공청소기 원심홴의 유동과 소음원 해석

An Alysis of Flow and Noise Source for Vacuum Cleaner Centrigugal Fan

  • 전완호 (한국과학기술원, 항공우주공학과) ;
  • 유기완 (한국과학기술원, 항공우주공학과) ;
  • 이덕주 (한국과학기술원, 항공우주공학과) ;
  • 이승갑 (삼성전자생활시스템연구소열유체그룹)
  • 발행 : 1997.02.01

초록

Centrigugal fans are widely used due to their ability to achieve relatively high pressure ratios in a short axial distance compared to axial fans. Because of their widespread use, the noise generated by these machines causes one of serious problems. In general, centrigugal fan noise is often dominated by tones at BPF(blade passage frequency) and its higher harmonics. This is a consequence of the strong interaction between the periodic flow discharged radially from the impeller and the stator blades or the cutoff. But in vacuum cleaner fan the noise is dominated by not only the discrete tones of BPF but also broadband frequencies. In this study we investigate the mechanism of broadband noise and predict for the unsteady flow field and the acoustic pressure field associated with the centrifugal fan. DVM(discrete vortex method) is used to calculates the flow field and the Lowson's method is used to predict the acoustic pressures. From the results we find that the broadband noise of a circular casing centrifugal fan is due to the unsteady force fluctuation around the impeller blades related to the vortex shedding. The unsteady forces associated with the shed vortices at impeller and related to the interactions to the diffuser and the exit.

키워드

참고문헌

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