0
RESEARCH PAPERS

Controlling the Tonal Characteristics of the Aerodynamic Noise Generated by Fan Rotors

[+] Author and Article Information
R. C. Mellin, G. Sovran

Research Laboratories, General Motors Corporation, Warren, Mich.

J. Basic Eng 92(1), 143-154 (Mar 01, 1970) (12 pages) doi:10.1115/1.3424923 History: Received July 31, 1969; Online October 27, 2010

Abstract

A technique has been developed for selecting circumferentially-unequal blade spacings that will reduce the tonal annoyance of the aerodynamic noise generated by the rotors of fans. The procedure has been successfully applied to a number of axial-flow fans. The predictions of harmonic spectra are based on an experimentally-determined sound-pressure wave shape for the individual blades of such fans. However, the technique can be extended to other types of tonal-annoyance problems provided that the particular relevant sound-pressure wave shape is determined. Unequal blade spacings that will produce a particular degree of “whiteness” in the noise with a minimum departure from equal spacing are tabulated for a range of blade numbers. Both unbalanced and naturally balanced blading arrangements are considered. A survey technique is also outlined for those applications in which it is important to reduce a particular frequency, or where blending with a given background noise must be achieved.

Copyright © 1970 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In