Aerodynamic Vibrations Caused by a Vortex Ahead of Hemisphere in Supersonic Flow
Parachutes are often used for planetary-entry and re-entry. Most of cases, parachutes are deployed at supersonic speed. Therefore, it is necessary to obtain aerodynamic characteristics at supersonic speed. However parachutes have wrinkles and seams. They make it difficult to study aerodynamic characteristics of the parachute shape. Therefore, experimental studies using solid models have been conducted from the 1960s re-entry program of the US . In particular, Helmut G. Heinrich et al. visualized shockwaves, and shockwave vibrations in Mach number 3 . These shockwave vibrations make the flow unstable, and the unstable flow gives model vibrations. They are risks of break.Therefore,Helmut G. Heinrich suggested an improved model.
KeywordsMach Number Wind Tunnel Test Model Supersonic Flow Compression Wave
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