AN INVESTIGATION OF THE CHARACTERISTICS OF SWIRLING FLOW IN A DIVERGING TUBE.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The effect of an imposed pressure gradient on the core of a vortex is examined both theoretically and experimentally. The test apparatus consisted of a vortex chamber and a diverging tube. The swirling flow was generated by means of adjustable vanes at the periphery of the vortex chamber and by introducing varying amounts of air. Pressure distributions were obtained along the wall of the tube for various flows and vane settings. In addition, the core of the vortex was photographed by introducing smoke at the axis of the vortex chamber. The theoretical and experimental results show the existence of standing waves arising from the vortex breakdown and the existence of critical conditions, depending on the ratio of the rotational and longitudinal velocity components, beyond which drastic changes of flow structure must occur. The theoretical results were found to be closely related to the observed phenomena. Author
- Fluid Mechanics