Abstract
The drag coefficient for freely falling cones with a vertex angle of 60° was determined experimentally in the Reynolds number range from 90 to 8×103 and described by empirical equations. The drag was determined by measurement of the terminal velocity of the cones falling through water. Flow-visualization experiments showed the different regimes of the wake structure for a wide range of the Reynolds numbers covering the successive destabilizations of the wake on the way to turbulence. Especially, a very regular staggered array of two rows of ring-shaped hairpin vortices appeared behind the cones in the Reynolds number range from 170 to 235. The Strouhal number was determined in the Reynolds number range from 170 to 1.2×103. The arrangement of the double row of vortex rings and the oscillatory motion of the cones were given in some detail.
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