Abstract
The flow of an organic vapor at high subsonic Mach numbers past a circular cylinder was investigated using Background-oriented Schlieren (BOS) and computational fluid dynamics. The experiment was carried out in a closed-loop organic vapor wind tunnel (CLOWT) using Novec 649 as working-fluid which provides a compressibility factor of $$Z=0.91$$ at the operating point investigated. For the first time, wake flow phenomena in organic vapor were optically resolved, including vortex streets and shock-wave interactions. In addition, a method for calculating the Strouhal number using Schlieren images is presented. Experiment and numerical investigation showed great agreement, demonstrating that BOS is ideally suited for visual analysis of flow phenomena in hot organic vapor.
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