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Experimental Investigation of Turbulence Structures in the Boundary Layer of a Highly Loaded Turbine Cascade FREE

[+] Author Affiliations
Dirk Wunderwald

ABB Turbo Systems Ltd, Baden, Switzerland

Leonhard Fottner

Universität der Bundeswehr München, Neubiberg, Germany

Paper No. 96-GT-249, pp. V005T16A012; 12 pages
doi:10.1115/96-GT-249
From:
  • ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • Birmingham, UK, June 10–13, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7876-7
  • Copyright © 1996 by ASME

abstract

An experimental study has been performed on a turbine cascade in order to obtain detailed information about the overall performance, the state of the boundary layer, and the topology of turbulent boundary layers. The analysis of profile pressure distributions and wake traverse measurements across the midspan section of the cascade blade provide information on the loss behaviour. Using surface-mounted hol-film gauges on the suction side of the measuring blade, transition modes have been investigated under the influence of various inlet flow conditions representative of engine operation.

Extensive measurements with 3D-hot-sensor anemometry have been evaluated to show essential features of the turbulent suction side boundary layer. The paper describes the dependence of turbulence characteristics, e.g. integral length scales and turbulent kinetic energy distribution, on the inlet flow conditions and the upstream boundary layer development. The influence of free-stream turbulence intensity and streamline curvature is discussed and the non-isotropy of the Reynolds normal stresses is presented. The evaluation of Reynolds stresses as well as triple order correlations should provide a further insight into the structure of turbulence and lead to a more realistic turbulence modelling.

Copyright © 1996 by ASME
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