dc.creator | Ayton, Lorna Jane | |
dc.creator | Chaitanya, P | |
dc.date.accessioned | 2017-08-15 | |
dc.date.accessioned | 2018-11-24T23:20:39Z | |
dc.date.available | 2017-12-07T15:54:56Z | |
dc.date.available | 2018-11-24T23:20:39Z | |
dc.date.issued | 2017-10-25 | |
dc.identifier | https://www.repository.cam.ac.uk/handle/1810/270044 | |
dc.identifier.uri | http://repository.aust.edu.ng/xmlui/handle/123456789/3623 | |
dc.description.abstract | This paper investigates the effects of local leading-edge geometry on unsteady aerofoil interaction noise. Analytical results are obtained by extending previous work for parabolic leading edges to leading edges of the form for . Rapid distortion theory governs the interaction of an unsteady vortical perturbation with a rigid aerofoil in compressible steady mean flow that is uniform far upstream. For high-frequency gusts interacting with aerofoils of small total thickness this allows a matched asymptotic solution to be obtained. This paper mainly focusses on obtaining the analytic solution in the leading-edge inner region, which is the dominant term in determining the total far-field acoustic directivity, and contains the effects of the local leading-edge geometry. Experimental measurements for the noise generated by aerofoils with different leading-edge nose radii in uniform flow with approximate homogeneous, isotropic turbulence are also presented. Both experimental and analytic results predict that a larger nose radius generates less overall noise in low-Mach-number flow. By considering individual terms in the analytic solution, this paper is able to propose reasons behind this result. | |
dc.publisher | Cambridge University Press | |
dc.publisher | Journal of Fluid Mechanics | |
dc.subject | acoustics | |
dc.subject | aeroacoustics | |
dc.title | Analytical and experimental investigation into the effects of leading-edge radius on gust-aerofoil interaction noise | |
dc.type | Article | |