Density Measurements for Rectangular Free Jets Using Background Oriented Schlieren

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dc.contributor.author Tipnis, T. J. -
dc.contributor.author Finnis, Mark V. -
dc.contributor.author Knowles, Kevin -
dc.contributor.author Bray, D. -
dc.date.accessioned 2014-02-01T05:01:49Z
dc.date.available 2014-02-01T05:01:49Z
dc.date.issued 2013-08-30T00:00:00Z -
dc.identifier.citation T.J. Tipnis, M.V. Finnis, K. Knowles and D. Bray, The Aeronautical Journal, 2013, Volume 117, Number 1194, Pages 771-784.
dc.identifier.issn 0001-9240 -
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/8232
dc.description.abstract An experimental study incorporating the use of the Background-Oriented Schlieren (BOS) technique was performed to measure the density field of a rectangular supersonic jet. This technique is easier to set up than conventional schlieren since the optical alignment involving the various mirrors, lenses and knife-edge is replaced by a background pattern and a single digital camera. The acquired images which contain information of density gradients in the flow are solved as a Poisson equation and further processed using deconvolution and tomographic algorithms to generate a 3-D domain which contains information about the actual density. 2-D slices can then be extracted to quantitatively visualise the density along any required planes. The results from supersonic axisymmetric jets are used for validation of the code; these show excellent agreement with pre-validated CFD data. The results for a rectangular supersonic jet are then obtained. These show good agreement with the CFD data, in terms of shock-cell spacing and overall structure of the jet. The technique has proved useful for investigating axis-switching, a phenomenon generally associated with non-axisymmetric jets. en_UK
dc.language.iso en_UK -
dc.publisher Royal Aeronautical Society en_UK
dc.title Density Measurements for Rectangular Free Jets Using Background Oriented Schlieren en_UK
dc.type Article -


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