Abstract
This paper is concerned with the laminar-turbulent transition and separation of three-dimensional boundary layers on spheres rotating in external axial flow. The experiment was carried out for three spheres of 150 mm, 200 mm and 250 mm in diameter by means of a hotwire anemometer. The flow pattern of boundary layer on the rotating spheres shifts from the laminar separation to the laminar-turbulent transition accompanying spiral vortices and the turbulent separation at a definite value S of the rotational speed ratio that is related to the Reynolds number Re based on sphere diameter and flow velocity. The traveling angular velocity of the spiral vortices relative to the rotating sphere surface was quantitatively investigated. The angular velocity ratio of the vortices to the rotating sphere had two values, 1.0 and 0.75. The latter means that the spiral vortices moved relative to the rotating sphere surface.
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