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14 August 2006 Application of digital interferometry to study of density field around sphere with flow separation
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Using our original method of interferometric data processing we have studied a radial density distribution in the flow separation range of a sphere flown in air at Mach number 2. This range contains a shock wave, a contact surface and a part of adjacent wake. The method is based on measurement of interferometric fringes and definition of light vector refraction component distributions normal to the symmetry axis. It is assumed that the interferometric picture has vertical fringes outside of the bow shock wave. The radial distributions are calculated according to the schlieren data processing. They were used for density field simulation and interferometric pictures visualization by the digital interferometry, some aspects of which were developed by authors early. The comparison of experimental interferometric pictures with the calculated pictures shows a possibility to use the considered method for study of the flow separation range. Results of the comparison are illustrated by examples of such interferometric pictures.
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Igor V. Ershov and Yuri D. Babichev "Application of digital interferometry to study of density field around sphere with flow separation", Proc. SPIE 6292, Interferometry XIII: Techniques and Analysis, 62920L (14 August 2006);

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