22 June 1999 Holographic interferometric and numerical visualization of three-dimensional unsteady shock wave interactions
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Proceedings Volume 3516, 23rd International Congress on High-Speed Photography and Photonics; (1999) https://doi.org/10.1117/12.350498
Event: Twenty-Third International Congress on High-Speed Photography and Photonics, 1998, Moscow, Russian Federation
Abstract
Recent results of observation of three-dimensional (3-D) unsteady shockwave reflections are presented. The experiments are carried out using a diaphragmless shock tube in which shock waves are produced by a quickly opening piston valve which separates a high pressure driver gas from a low pressure test gas. This mechanism allows to create shock waves with a higher degree of repeatability than those obtained by conventional shock tubes in which shock waves are generated by rupturing diaphragms. Double exposure diffuse holographic interferometry is used for optical visualization. Instead of using diffusive object beams, collimated object beams are diffused by their reflection from the shock tube wall and the model painted with fluorescent paint. In addition, the time interval between two exposures is set to about 1 microsecond. Hence 3-D shock wave patterns are clearly observable. The experiment is supplemented by numerical visualizations using a 3-D adaptive unstructured Euler code working on the Cray C- 90 supercomputer platform, and then EnSight postprocessor is used to create numerical images. Two cases are examined: shock wave reflection from an inclined cylinder, and shock wave interaction with corner formed by the intersection of to wedges at 90 degree.
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Eugene V. Timofeev, Eugene V. Timofeev, Ken Takayama, Ken Takayama, P. A. Voinovich, P. A. Voinovich, Jean P. Sislian, Jean P. Sislian, } "Holographic interferometric and numerical visualization of three-dimensional unsteady shock wave interactions", Proc. SPIE 3516, 23rd International Congress on High-Speed Photography and Photonics, (22 June 1999); doi: 10.1117/12.350498; https://doi.org/10.1117/12.350498
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