dc.creator | Ayton, Lorna Jane | |
dc.creator | Peake, Nigel | |
dc.date.accessioned | 2018-11-24T23:18:00Z | |
dc.date.available | 2015-04-07T11:02:14Z | |
dc.date.available | 2018-11-24T23:18:00Z | |
dc.date.issued | 2015-02-04 | |
dc.identifier | https://www.repository.cam.ac.uk/handle/1810/247279 | |
dc.identifier.uri | http://repository.aust.edu.ng/xmlui/handle/123456789/3210 | |
dc.description.abstract | 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 asymptotic analysis of the Euler
equations linearised about steady parallel shear flow, in the limits of high frequency
and small, but non-zero, aerofoil thickness and Mach number. The analysis splits
the flow into various regions around the aerofoil; local inner regions around the
leading and the trailing edges where sound is generated and scattered; a surface
transition region accounting for the curvature of the aerofoil; a wake transition
region downstream of the aerofoil; and an outer region through which the sound
propagates to the observer. Solutions are constructed in all regions, and matched
using the principle of matched asymptotic expansions to yield the first two terms in
the expansion of both the amplitude and the phase of the far-field pressure. Result are
computed for the particular case of scattering of a gust by a symmetric Joukowski
aerofoil placed in symmetric Gaussian parallel shear flow. The introduction of mean
shear is shown to have a significant effect on the far-field directivity and on the total
radiated power. | |
dc.language | en | |
dc.publisher | CUP | |
dc.publisher | Journal of Fluid Mechanics | |
dc.subject | acoustics | |
dc.subject | aeroacoustics | |
dc.title | On High-Frequency Sound Generated by Gust-Aerofoil Interaction in Shear Flow | |
dc.type | Article | |