Counter-rotation propeller tip vortex interaction noise

Kingan, Michael J. and Self, Rod H. (2009) Counter-rotation propeller tip vortex interaction noise. 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), Miami, USA. 10 - 12 May 2009.

Record type: Conference or Workshop Item (Paper)

Abstract

Counter-rotation propeller tip vortex interaction noise occurs when tip vortices, shed
from each of the upstream propeller blades, interact with the blades on the downstream
propeller. This paper describes two separate models for calculating the noise produced by
this interaction. The first model approximates each tip vortex as a helical vortex tube of
infinite extent while the second is based on a previously published study and uses a twodimensional
approximation to model the tip vortex interaction and represents the velocity
field induced by the tip vortices as a piecewise function for which the flow incident on the
downstream blade row must be calculated numerically. The unsteady loading on the
downstream propeller blades is determined from the incident flow predicted using either of
the models and is used to calculate the radiated sound field using an analytic propeller noise
formula

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