Author(s): Roland Hollenstein

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Abstract: The Tiroler Kraftwerke AG (TIWAG) constructed a new power plant on the river Inn at Langkampfen, close to Kufstein, Austria. A 1: 2 scale trashrack model was built and tested at the Laboratory of Hydraulics, Hydrology and Glaciology (VAW) of the Swiss Federal Institute of Technology (ETH) in Zurich to investigate the potential of flowinduced vibrations. A portion of the grid structure including eight bars was considered to give accurate information. With two degrees of freedom in the streamwise and the crossflow directions, the trashrack model reproduced the main vibration modes of the prototype. The single bars had an aspect ratio of 1: 5. 6. Investigations regarding vortex shedding reproduced a maximum Strouhal number of 0. 24. The mutual interaction of the formation of single vortices, the angle of incidence and the flow turbulence affected the rack vibration characteristics. The multiple-mode vibrations were caused by either Impinging Leading-Edge Vortex Shedding (ILEV) or Alternate-Edge Vortex Shedding (AEVS), with the transition from ILEV to AEVS occuring between angles of incidence of 15°-30°.

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Year: 1999