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Combined Quadrupole-dipole Model for Inlet Flow Distortion Noise from a Subsonic FanA combined quadrupole-dipole model has been developed for the noise generated by inlet flow distortion in a subsonic fan. A formula is derived for the total upstream-radiated acoustic power in each tone as a function of the design parameters of the fan and the properties of the inlet flow distortion. Numerical results are obtained for values of the parameters corresponding to various quiet fans. The analysis is compared with noise measurements taken on a 51-cm (20-in.) diameter research fan as well as with those taken on a number of full-scale fan stages. Fairly good agreement was obtained. It should therefore be possible to use this model to study the noise-reduction potential of the various fan design parameters.
Document ID
19740013525
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Goldstein, M. E. (NASA Lewis Research Center Cleveland, OH, United States)
Dittmar, J. H. (NASA Lewis Research Center Cleveland, OH, United States)
Gelder, T. F. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
E-7881
NASA-TN-D-7676
Accession Number
74N21638
Funding Number(s)
PROJECT: RTOP 501-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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