AN EXPERIMENTAL INVESTIGATION OF THE UNSTEADY FLOWS ABOUT SPHERES AND DISKS.

摘要: Abstract : The various features of unsteady three-dimensional bluff body flow fields have been studied in a towing channel filled with glycerol-water mixtures and equipped an air bearing supported model carriage. Steady drag coefficients for the sphere disk agreed existing data except range 100 < Re sub d 1000 where C D is as much 50% lower than previous results. Peak-to-peak moment developed on are order 0.007 500 at nondimensional frequencies 0.10 fd/U 0.14. wake was seriously disturbed by sting support, however, side force coefficient 0.02 to 270 560. Flow visualization studies using hydrogen bubbles were used relate forces shedding vortices wake. (Author)