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A Lighthill based jet noise model for acoustic shielding prediction
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aeroacoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-0176-5358
Trinity College, Dublin, Ireland.
2010 (English)In: 17th International Congress on Sound and Vibration, ICSV17: Volume 1, 2010, 558-565 p.Conference paper (Other academic)
Abstract [en]

The majority of research on jet noise has considered isolated shear-flows and, as such, jet noise models based on Lighthill's acoustic analogy traditionally assume a free-space Green's function for propagation. In order to evaluate the reduction in jet noise attainable from proposed airframe shielding configurations, a jet noise model based on Lighthill's analogy is derived in this paper, which retains an explicit Green's function in the expression for the far-field spectral density. This Green's function may be evaluated to include the diffraction of the sound field about an acoustic shield. A preliminary comparison is made with the limited data available for shielded jets. In addition to facilitating the study of shielding configurations, isolated predictions made using this model compare favourably with isolated jet noise data.

Place, publisher, year, edition, pages
2010. 558-565 p.
Keyword [en]
Acoustic analogy, Far-field, Jet noise, Limited data
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-92294ScopusID: 2-s2.0-84871419080ISBN: 978-161782255-1OAI: diva2:513172
17th International Congress on Sound and Vibration 2010, ICSV 2010; Cairo; Egypt; 18 July 2010 through 22 July 2010

QC 20120809

Available from: 2012-03-30 Created: 2012-03-30 Last updated: 2016-04-25Bibliographically approved

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