This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Tone Noise Radiation from a Ducted Subsonic Fan
Annotation ability available
Sector:
Language:
English
Abstract
An analytical/computational method of computing radiated noise from ducted rotor due to inflow distortion and turbulence is presented. Analytical investigations include an appropriate description of sources, the cut-off conditions imposed on the modal propagation of the pressure waves in the annular duct, and reflections at the upstream end of the duct. Far field sound pressure levels at blade passing frequency due to acoustic radiation from a small scale low speed fan are computed. Theoretical productions are in reasonable agreement with experimental measurements.
Authors
Citation
Agarwal, R., "Tone Noise Radiation from a Ducted Subsonic Fan," SAE Technical Paper 971459, 1997, https://doi.org/10.4271/971459.Also In
References
- Rao, G.V.R. Chu, W.T. Digumarthi, R.V. “Theoretical Studies of Tone Noise from a Fan Rotor,” NASA CR-2354 November 1973
- Osborne, C. “Unsteady Thin Airfoil Theory for Subsonic Flow,” AIAA Journal 11 1973 205 209
- Tyler, J.M. Sofrin, T.G. “Axial Flow Compressor Noise Studies,” S.A.E. Trans. 70 309 332
- Lansing, D.L. “Exact Solution for Radiation of Sound from a Semi-Infinite Circular Duct with Application to Fan and Compressor Noise.” Analytical Methods in Aircraft Aerodynamics, NASA SP-228
- Morse, P.M. “Vibration and Sound,” McGraw-Hill 1948
- Kaji, S. “Radiation of Rotational Noise of Turbo Machinery at Duct Opening,” Trans. Japan Soc. Mech. Eng. 38 315 November 1972
- Hodder, B.K. “Investigation of the Effect of Inlet Turbulence Length Scale on Fan Discrete Noise,” NASA TM X-62 300 September 1973