Studies of autorotation of an ellitic cylinder are carried out experimentally using a changeable-pressure wind tunnel. The number of rotations per unit time increases with velocity, but it keeps constant in non-dimensional form. The flow field around the cylinder are surveyed using a hot-wire anemometer together with flow visualization technique by smoke wire method. Drag, lift and momentum of the cylinder in rotation are measured by a strain gauge balance at various cases of velocity and pressure. The results of the measurements are compared with numerical simulations by discrete vortex method.
楕円柱の自励回転の実験
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