An investigation of the turbulent integral length scales in an underexpanded axisymmetric jet

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Abstract

Velocity measurements of an axisymmetric underexpanded supersonic
jet operated at a nozzle pressure ratio (NPR) of 2:6 are acquired using a high resolution particle image velocimetry system. The coherent and random fluctuations believed to be responsible for the primary noise generating mechanisms, such as screech, shock associated noise, and turbulent mixing noise have been linked to the proper orthogonal decomposition (POD) modes. The coherent flow variable is reconstructed using the most energetic modes. Effects of the turbulence-shock interactions are examined by evaluating the integral length scales of each component. The turbulence undergoes a compression and re-expansion period as it passes through the shocks within the potential core. A comparison with literature highlights differences in the evolution of the length scales, with emphasis on a priori and a posteriori approaches for decomposing the flow.
Original languageEnglish
Title of host publicationProceedings of the 7th Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion
EditorsDamon Honnery, Daniel Edgington-Mitchell
Place of PublicationClayton Victoria Australia
PublisherMonash University Publishing
Pages173 - 178
Number of pages6
ISBN (Print)9780646948928
Publication statusPublished - 2015
EventAustralian Conference on Laser Diagnostics in Fluid Mechanics and Combustion 2015 - Melbourne, Australia
Duration: 9 Dec 20159 Dec 2015
Conference number: 7th

Conference

ConferenceAustralian Conference on Laser Diagnostics in Fluid Mechanics and Combustion 2015
CountryAustralia
CityMelbourne
Period9/12/159/12/15

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