'Bio-inspired aerofoil adaptations for the reduction of turbulence interaction noise' by Lorna Ayton (DAMTP, Cambridge)

Duration: 33 mins 57 secs

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'Bio-inspired aerofoil adaptations for the reduction of turbulence interaction noise' by Lorna Ayton (DAMTP, Cambridge)'s image

Description:	Talk given by Dr Lorna Ayton (DAMTP, University of Cambridge) at Department of Engineering, University of Cambridge, 3 May 2019, as part of the CUED Fluids seminar series. Please note the first part of this talk is missing due to technical problems.


Created:	2019-07-11 12:09
Collection:	Cambridge Engineering Dept Fluids Seminars
Publisher:	University of Cambridge
Copyright:	Dr Lorna Ayton
Language:	eng (English)


Abstract:	A dominant source of broadband aeroengine noise arises when the unsteady wakes shed from rotors interact with downstream stators. This so-called leading-edge noise cannot be eliminated, but it can be reduced. By altering the spanwise geometry of the leading edge of an aerofoil it is known through experimental testing that leading-edge noise can be significantly reduced over broadband frequencies. In recent years, a multitude of different shapes have been tested and all are seen to have benefits for different frequency ranges, which may be ideal for the reduction of tonal noise, but the question remains; which design is optimal for broadband noise reduction? This talk presents a theoretical model for leading-edge noise, both for straight edges and serrated edges. Through theoretical optimisation, a set of rules are proposed which lead to an optimal design for broadband leading-edge noise reduction. Experimental data on sample new designs validates the theoretical predictions and illustrates up to an additional 7dB noise reduction verses conventional serrated designs.

Abstract:

A dominant source of broadband aeroengine noise arises when the unsteady wakes shed from rotors interact with downstream stators. This so-called leading-edge noise cannot be eliminated, but it can be reduced. By altering the spanwise geometry of the leading edge of an aerofoil it is known through experimental testing that leading-edge noise can be significantly reduced over broadband frequencies. In recent years, a multitude of different shapes have been tested and all are seen to have benefits for different frequency ranges, which may be ideal for the reduction of tonal noise, but the question remains; which design is optimal for broadband noise reduction?

This talk presents a theoretical model for leading-edge noise, both for straight edges and serrated edges. Through theoretical optimisation, a set of rules are proposed which lead to an optimal design for broadband leading-edge noise reduction. Experimental data on sample new designs validates the theoretical predictions and illustrates up to an additional 7dB noise reduction verses conventional serrated designs.

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