Holographic interferometric and numerical visualization of three-dimensional unsteady shock wave interactions
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説明
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.
収録刊行物
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- SPIE Proceedings
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SPIE Proceedings 3516 252-, 1999-06-22
SPIE