Time-averaged three-dimensional density and temperature field measurement of a turbulent heated jet using background-oriented schlieren

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Abstract

Three-dimensional time-averaged density and temperature fields of a heated air jet from a circular 10 mm diameter nozzle are reconstructed using tomographic background-oriented schlieren. A hybrid filtered back-projection–algebraic reconstruction (FBP-ART) technique reconstructs the refractive index gradient field in the flow. The number of ART iterations is varied to observe the effect on reconstruction artefacts. The largest improvement is observed after 1 ART iteration with filtering of the initial FBP solution. Subsequently, the gradient field is used to form a Poisson equation solved in a quasi-3D manner using successive over-relaxation. Convergence of the refractive index field is studied with iteration number and the effect this has on the temperature and density profiles, after applying the Gladstone-Dale relation and ideal gas law. The quasi-3D solution parallelises well, and converges rapidly.

Original languageEnglish
Title of host publicationProceedings of the 21st Australasian Fluid Mechanics Conference
EditorsTimothy C.W. Lau, Richard M. Kelso
PublisherAustralasian Fluid Mechanics Society
Number of pages5
ISBN (Electronic)9780646597843
Publication statusPublished - 2018
EventAustralasian Fluid Mechanics Conference 2018 - Adelaide Convention Centre, Adelaide, Australia
Duration: 10 Dec 201813 Dec 2018
Conference number: 21st
https://aomevents.eventsair.com/QuickEventWebsitePortal/21st-australasian-fluid-mechanics-conference/afmc2018

Conference

ConferenceAustralasian Fluid Mechanics Conference 2018
Abbreviated titleAFMC 2018
CountryAustralia
CityAdelaide
Period10/12/1813/12/18
Internet address

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