Experimental study of toroidal shock wave focusing in a compact vertical annular diaphragmless shock tube |
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Authors: | S H R Hosseini Kazuyoshi Takayama |
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Institution: | (1) Interdisciplinary Shock Wave Research Laboratory, Institute of Fluid Science, Tohoku University, 2-1-1, Katahira, Aoba, Sendai 980-8577, Japan;(2) Department of Mechanical Systems Engineering, Muroran Institute of Technology, 27-1, Mizumoto, Muroran 050-8585, Japan; |
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Abstract: | The paper reports results of experiments regarding toroidal shock wave focusing in a vertical shock tube as a part of a series
of converging shock wave studies. This compact vertical shock tube was designed to achieve a high degree of reproducibility
with minimum shock formation distance by adopting a diaphragmless operating system. The shock tube was manufactured in the
Institute of Fluid Science, Tohoku University. An aspheric lens shaped cylindrical test section was connected at the open
end of the shock tube to visualize the diffraction and focusing of the toroidal shock wave released from the ring shaped shock
tube opening. Pressure transducers were flush mounted on the shock tube’s test section to measure pressure histories at the
converging test section. Double exposure holographic interferometry was employed to quantitatively visualize the shock waves.
The whole sequence of toroidal shock wave diffraction, focusing, and its reflection from the symmetrical axis were successfully
studied. The transition of reflected shock waves was observed. |
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