Abstract
The frequency of vortex shedding from two flat plates normal to a stream is experimentally investigated in various staggered arrangements at a Reynolds number of 2.60 ×104. The Strouhal number of vortex shedding varies widely from 0.067 to 0.343 for the upstream flat plate, and from 0.067 to 0.170 for the downstream flat plate. Four kinds of discontinuities in Strouhal number distributions are found. Flow visualizations suggest that wake widths behind the flat plates and path lines of shedding vortexes have an important influence on discontinuities of the Strouhal number. As long as distances between two centers of flat plates are larger than 2 chords, the wake Strouhal number, defined by the wake width, nearly equals that for a single flat plate, 0.156.
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