A THEORETICAL AND EXPERIMENTAL STUDY OF THE FLUID MOTION ABOUT A FLAT PLATE ROTATED IMPULSIVELY FROM REST TO A UNIFORM ANGULAR VELOCITY
NEBRASKA UNIV LINCOLN DEPT OF MECHANICAL ENGINEERING
Pagination or Media Count:
The report presents the results of an experimental and theoretical investigation of separated unsteady flow about a flat plate a fin or aileron rotating impulsively from rest to a uniform angular velocity about an axis along its leading edge in an incompressible fluid otherwise at rest or moving steadily and uniformly about the plate. The results show that the early stages of motion are accompanied by torsional oscillations, the frequency of which is identical with the natural frequency of the submerged system. The initial hydrodynamic torque is determined by the added mass-moment of inertia of the plate. In the oscillatory stage of motion the torque is comprised of an angular-velocity- dependent form-torque and an acceleration-dependent inertial torque. These torque components are interdependent as well as time-dependent. The rotation of the plate in a steady uniform flow gives rise to a hinge moment which is considerably larger than that of a plate held fixed at the same instantaneous angle of incidence.
- Fluid Mechanics