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Research on the Farfield Tonal Fan Noise at Small Mach Number

[+] Author Affiliations
Shi-Jian Zhu

Naval University of Engineering

Xian-Jun Wu

Wuhan University of Technology

Paper No. IMECE2006-13866, pp. 93-97; 5 pages
doi:10.1115/IMECE2006-13866
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Noise Control and Acoustics
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Noise Control and Acoustics Division
  • ISBN: 0-7918-4776-4 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

The calculation model of the farfield tonal noise of a subsonic fan was studied in this paper in order to find the main sources of tonal noise. A full model and a simplified model, which neglects the acceleration noise, were brought out. Experiment was done to verify the full model and good fitness were found between the calculated result and the measured result. Numerical experiments were then done to compare among those two models and the Gutin formula, which calculates the acceleration noise of steady force. Results reveal that at small Mach number the simplified model, which takes only the fluctuating force into account, approximates exactly with the full model. Because the noise calculated by Gutin formula is very small, it is concluded that the tonal noise of a subsonic fan with the Mach number less than 0.2 is caused mainly by the fluctuating force. It gives a guideline to cut fan noise down.

Copyright © 2006 by ASME

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