On the effect of inflow distortions of propeller noise

Petricelli, Federico, Palleja Cabre, Sergi, Paruchuri, Chaitanya, Joseph, Phillip, Karimian, Amin, Meloni, Stefano and Camussi, Roberto (2022) On the effect of inflow distortions of propeller noise. In 28th AIAA/CEAS Aeroacoustics Conference, 2022. (doi:10.2514/6.2022-2938).

Abstract

Propellers usually operate in non-uniform flows, which is expected to modify the behaviour of the emitted noise field. In this framework, an experimental campaign with far-field noise measurements of a two-blade propeller, immersed in a non-uniform flow, has been performed in the anechoic facility at the University of Southampton. A parametric analysis of the effects of different flow non-uniformities, generated by different masks positioned at the nozzle exhaust, was performed at constant thrust. Results show that non-uniformities in the incoming flow exalt the interaction tones. Tonal peaks, starting from the third blade passage frequency harmonic, register variations in the order of tens of decibels, up to a maximum of 12db. Experimental outcomes are compared with tonal noise predictions obtained by using a frequency domain formulation, based on integrating the aerodynamic sources on the proper surface of the blade. The model captures the main features of the interaction tones and a good agreement is reached between measured and predicted values in both sound pressure levels and directivity.

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Contributors

Author: Sergi Palleja Cabre

Author: Amin Karimian

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