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On High-Frequency Sound Generated by Gust-Aerofoil Interaction in Shear Flow
(CUPJournal of Fluid Mechanics, 2015-02-04)
A theoretical model is constructed to predict the far-field sound generated by
high-frequency gust–aerofoil interaction in steady parallel shear flow, including the
effects of aerofoil thickness. Our approach is to use ...
Bio-inspired canopies for the reduction of roughness noise
(ElsevierJournal of Sound and Vibration, 2016-12-22)
This work takes inspiration from the structure of the down covering the flight feathers of larger species of owls, which contributes to their ability to fly almost silently at frequencies above 1.6 kHz. Microscope photographs ...
Bioinspired trailing-edge noise control
(American Institute of Aeronautics and AstronauticsAIAA Journal, 2017-01-01)
Strategies for trailing edge noise control have been inspired by the downy canopy that covers the surface of exposed flight feathers of many owl species. Previous wind tunnel measurements demonstrate that canopies of similar ...
The acoustic Green's function for swirling flow in a lined duct
(ElsevierJournal of Sound and Vibration, 2017-05-12)
This paper considers the acoustic field inside an annular duct carrying mean axial and swirling flow and with either acoustically hard or lined walls. The particular aim is to compute the Green's function, which is required ...
Secondary instability and tertiary states in rotating plane Couette flow
(Cambridge University PressJournal of Fluid Mechanics, 2014-11-14)
Recent experimental studies have shown rich transition behaviour in rotating plane Couette
ow (RPCF). In this paper we study the transition in supercritical RPCF theoretically
by determination of equilibrium and periodic ...
An analytically-based method for predicting the noise generated by the interaction between turbulence and a serrated leading edge
(ElsevierJournal of Sound and Vibration, 2018-05-26)
This paper considers the interaction of turbulence with a serrated leading edge. We investigate the noise
produced by an aerofoil moving through a turbulent perturbation to uniform flow by considering the scattered
pressure ...
Noise generation by turbulence-propeller interaction in asymmetric flow
(Cambridge University PressJournal of Fluid Mechanics, 2014)
This paper is concerned with a particular source of both broadband and tonal aeroengine noise, termed Unsteady Distortion Noise (UDN). UDN arises from the interaction between turbulent eddies, which occur naturally in the ...
A WKB approximation of elastic waves travelling on a shell of revolution
(ElsevierJournal of Sound and Vibration, 2016-08-04)
This paper is concerned with the elastic waveguide properties of an infinite pipe with circular cross section whose radius varies slowly along its length. The equations governing the elastodynamics of such shells are derived ...
Interaction of turbulence with the leading-edge stagnation point of a thin aerofoil
(Cambridge University PressJournal of Fluid Mechanics, 2016)
An asymptotic model is constructed to analyse the interaction of turbulence generated far upstream with a thin elliptic-nosed solid body in uniform flow. The leading-edge stagnation point causes significant deformation of ...
The Importance of the Unsteady Kutta Condition when Modelling Gust-Aerofoil Interaction
(ElsevierJournal of Sound and Vibration, 2016-06-01)
The Kutta condition is applied to aerofoils with sharp trailing edges to allow
for viscous effects to be considered within a simplified system of equations
that are inviscid. This paper discusses in detail the inclusion ...