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Prediction of Aeroacoustic Noise Levels in Cross-Flow Fans for Air Conditioners

[+] Author Affiliations
Shigehisa Funabashi, Yasushi Shigenaga, Masatoshi Watanabe, Yoshihiro Takada

Hitachi, Ltd., Ibaraki, Japan

Paper No. HT-FED2004-56061, pp. 753-759; 7 pages
doi:10.1115/HT-FED2004-56061
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 1
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4690-3 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

We have developed a prediction model for the overall level of aeroacoustic noise generated by cross-flow fans. It is based on two assumptions: the velocities along the outside edge of the impeller have an especially close relation to the noise levels, and the noise levels are in proportion to the sixth power of the relative velocities at the edge of the blade. A computational fluid dynamics is used to obtain the necessary velocity-field data for this prediction model. The predicted noise levels of a test impeller for different flow coefficients are in good agreement with the measured results. This means that variations in noise levels with the flow coefficient can be described accurately by the prediction model, which should prove to be a useful tool for speeding up the development of silent cross-flow fans.

Copyright © 2004 by ASME

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