Interferometric measurement and tomography of the density field of supersonic jets |
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| Authors: | A Dillmann T Wetzel C Soeller |
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| Institution: | Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR) Bunsenstr. 10, D-37073 G?ttingen, Germany, DE
Max-Planck-Institut für Str?mungsforschung Bunsenstr. 10, D-37073 G?ttingen, Germany, DE
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| Abstract: | The density field of cylindrical supersonic jets is investigated by Mach-Zehnder interferometry. The optical phase shift
is extracted from the interferograms by digital image processing. Disturbing turbulence effects in the free shear layer are
eliminated by sequential averaging of the phase shifts of several experimental images. The resulting steady state phase shift
is used to calculate time-averaged interferograms and to reconstruct the density field by computerized tomography. The obtained
results are compared with theoretical predictions and good quantitative agreement is found.
Received: 3 March 1997/Accepted: 3 October 1997 |
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