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Organized Streamwise Vorticity on Convex Surfaces With Particular Reference to Turbine Blades

By J. Paul Gostelow, Ali Mahallati, William E. Carscallen and Aldo Rona

Abstract

This paper was published as AIAA Conference Paper 2010-904, 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, 4-7 January 2010. Copyright the American Institute of Aeronautics and Astronautics. It is also available from http://www.aiaa.org/content.cfm?pageid=534&id=1818&luPubID=497. This paper appears in the LRA with the permission of the AIAA.Experiments were conducted on the flow through a transonic turbine cascade and at\ud subsonic speeds past a circular cylinder in cross-flow. These followed extensive work on\ud vortex shedding behind these bodies, displaying the phenomena of energy separation at\ud subsonic speeds; the turbine blades also exhibited exotic vortex-shedding modes in transonic\ud flow. Surface flow visualization was undertaken on the suction surface of the turbine blade\ud and on the circular cylinder. This was effective in providing a time-average mapping of the\ud vortical structures within the blade passage and around the cylinder. The usual phenomena\ud of horseshoe vortices, secondary flows, passage vortices and wall and corner vortices were\ud observed. In addition, and more surprisingly, organized systems of fine-scale streamwise\ud vortices were observed for both cases. Under the influence of the strong favorable pressure\ud gradients on the turbine blade suction surface, the vortices persisted to the trailing edge. For\ud the circular cylinder work, undertaken at an inlet Mach number of 0.5, the streamwise\ud vortices occupied the forward portion of the cylinder, almost to the 83 degree azimuth, and\ud re-appeared after laminar separation. This streamwise vorticity had been predicted and\ud observed previously for low speed flows, with attendant theories for wavelength. The\ud present results have been compared with the predictions giving reasonable agreement

Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Year: 2010
OAI identifier: oai:lra.le.ac.uk:2381/7655

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