Structure of high frequency Green's function in non-axi-symmetric (chevron-type) transversely sheared mean flows using a Ray tracing solver within the generalized acoustic analogy formulation
Stirrat, Sarah and Afsar, Mohammed (2019) Structure of high frequency Green's function in non-axi-symmetric (chevron-type) transversely sheared mean flows using a Ray tracing solver within the generalized acoustic analogy formulation. In: The 32nd Scottish Fluid Mechanics Meeting, 2019-05-30 - 2019-05-30, University of Dundee, School of Science and Engineering.
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Abstract
The chevron nozzle continues to remain a popular approach to reducing jet noise, which works by breaking up the turbulence structures at all scales. As indicated in Figure 1, high frequency sound waves are produced by the fine-scale turbulence structures and are emitted at a larger angle from the jet axis than low frequency waves meaning they are the greatest risk to health for airfield employees. High frequency noise can be studied using ray theory, and here a previously developed high frequency ray tracing approach was applied to the case of a chevron with multiple lobes. The aim was to numerically evaluate the scaled Green’s function to see how it was affected by increasing the number of lobes, and see how this could reduce jet noise.
ORCID iDs
Stirrat, Sarah and Afsar, Mohammed ORCID: https://orcid.org/0000-0002-7417-2089;-
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Item type: Conference or Workshop Item(Poster) ID code: 68413 Dates: DateEvent30 May 2019PublishedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering Depositing user: Pure Administrator Date deposited: 17 Jun 2019 10:57 Last modified: 17 Sep 2024 00:24 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/68413