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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

THREE-DIMENSIONAL FLOW STRUCTURE AND TURBULENCE MEASUREMENTS ABOUT A TRAILING EDGE FILM-COOLING BREAKOUT

pages 1317-1322
DOI: 10.1615/TSFP5.2060
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Краткое описание

An experimental study is performed to examine the flow structure and turbulence about a model turbine blade trailing edge film-cooling breakout. A model consisting of a NACA 0012 airfoil modified to have a realistic trailing edge breakout was placed in a water tunnel. The breakout geometry is based on approximate measurements of several modern turbine blades. Reynolds number based on chord length is approximately 56,000. High resolution particle image velocimetry is performed to examine the flow field and turbulence about the breakout region. The results suggest that the geometry and cooling flow result in a highly three-dimensional flow in the immediate vicinity of the breakout. Also, the cooling flow significantly increases the turbulent kinetic energy immediately downstream of the breakout. All of this implies strong mixing between the mainstream flow and cooling flow that is likely responsible for degrading film-cooling effectiveness at the trailing edge.

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