The University of Southampton
University of Southampton Institutional Repository

Jet noise from instability mode interactions

Record type: Conference or Workshop Item (Paper)

A nonlinear interaction model is used to study sources of sound in jets. The model uses quadratic interactions of instability modes, which are obtained by solving the linear parabolized stability equations. Source terms involving nonlinear interactions are evalu- ated and a linear wave equation is solved with direct injection of the source terms. Thus the complete method solves only linear partial differential equations, coupled by nonlinear source terms. It allows the contribution of each modal interaction to be studied separately, giving a breakdown of the radiation pattern of each interaction. The method is demonstrated using a fixed base flow matched to the experiment of Stromberg et al. (J. Fluid Mech. 72(2), 1980). The squared streamwise velocity quadrupole is the largest source term for axisymmetric mode interactions, while for helical-helical mode interactions both the squared radial and squared azimuthal velocities are the main contributing sources, despite a strong cancelation effect between them. Results are also presented for an alternative implementation, in which the base flow is allowed to vary according to the Reynolds stresses of the developing instability modes. This model demonstrates sound production during mode growth and subsequent saturation.

PDF AIAA-2008-2987-SandhamSalgadoAgarwal.pdf - Author's Original
Download (4MB)

Citation

Sandham, Neil D., Salgado, Adriana M. and Agarwal, Anurag (2008) Jet noise from instability mode interactions At 14th AIAA/CEAS Aeroacoustics Conference. 05 - 07 May 2008. 12 pp.

More information

Published date: 6 May 2008
Venue - Dates: 14th AIAA/CEAS Aeroacoustics Conference, 2008-05-05 - 2008-05-07
Keywords: jet noise, weakly nonlinear model
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 64135
URI: http://eprints.soton.ac.uk/id/eprint/64135
PURE UUID: 69932193-b5bd-4a44-9cb6-5de36c7229f3

Catalogue record

Date deposited: 02 Dec 2008
Last modified: 17 Jul 2017 14:14

Export record


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×