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Acoustic source identification for transitional airfoil flows using cross correlations

Jones, L.E., Sandham, N.D. and Sandberg, R.D. (2010) Acoustic source identification for transitional airfoil flows using cross correlations AIAA Journal, 48, (10) (doi:10.2514/1.J050345).

Record type: Article

Abstract

Direct numerical simulations have been conducted of the flow over NACA-0006 and NACA-0012 airfoils. For all cases multiple sources of noise have been observed. At low frequencies, the contribution of trailing-edge noise radiation is significant, while for the high frequencies, the radiated noise appears to be due only to flow events in the transition/reattachment region on the suction side. Cross correlations of acoustic and hydrodynamic quantities, combined with ray-acoustic theory, are used to identify the main source locations. While the physical origin of trailing-edge noise can be clearly identified using these methods, the situation is less clear for additional noise sources that radiate at high frequency. Evidence suggests that these additional noise sources are located downstream of transition on the suction side of the airfoil, in the region directly downstream of boundary-layer reattachment.

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More information

Published date: October 2010
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 168475
URI: http://eprints.soton.ac.uk/id/eprint/168475
ISSN: 0001-1452
PURE UUID: f9065e80-7be5-4227-b4a6-232595fd3d23

Catalogue record

Date deposited: 30 Nov 2010 09:27
Last modified: 18 Jul 2017 12:20

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