19 June 2002 Digital interferometry application to the study of hypersonic wind tunnel flows
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Laser holographic interferometer was used for visualization of axisymmetrical free flows at Mach number 6 in test section of the hypersonic wind tunnel. This interferometer was designed on a basis of Schlieren apparatus with restricted test beam diameter. So the visualization of all flow fields including its boundaries was impossible. Such visualization, however, is necessary for the calculation of radial density distributions from the interferometric data. It is of interest to study the density behavior near axis, where under theoretical prediction a local uniformity can exist. The interferometric measurements assure determination of flow core boundaries and ratios of nozzle exit pressure to the pressure in test section. It is proposed to do density fields simulation based on results of the theoretical calculation of jets at established pressure ratios. In addition, special simulation is used for description of the density uniformity near the axis. Using simulated density fields, theoretical interferograms were calculated using digital interferometry technique, which was developed by authors early. So it was defined the condition for revealing local perturbation of flow field near axis.
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Igor Victorovic Ershov, Igor Victorovic Ershov, Yuriy D. Babichev, Yuriy D. Babichev, } "Digital interferometry application to the study of hypersonic wind tunnel flows", Proc. SPIE 4778, Interferometry XI: Applications, (19 June 2002); doi: 10.1117/12.473568; https://doi.org/10.1117/12.473568

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