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Experimental and Numerical 3-D Investigations of the Flow Field Behind the Trailing Edge of a Cooled Turbine Guide Vane FREE

[+] Author Affiliations
Dieter E. Bohn, Volker J. Becker, Klaus D. Behnke

Aachen University of Technology, Aachen, Germany

Paper No. 96-TA-027, pp. V001T08A007; 13 pages
doi:10.1115/96-TA-027
From:
  • ASME 1996 Turbo Asia Conference
  • ASME 1996 Turbo Asia Conference
  • Jakarta, Indonesia, November 5–7, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7877-4
  • Copyright © 1996 by ASME

abstract

Experimental investigations have been carried out to analyze the hot gas flow and cooling gas flow in the direct vicinity of the trailing edge of a modern gas turbine vane, with cooling gas ejection through the trailing edge. The investigations were performed in one of the institute’s test turbines. The experimental set-up is designed to establish variable blowing ratios between cooling gas mass flow and hot gas mass flow. An alternative density ratio between hot gas and cooling gas was established by the use of CO2 instead of air as the cooling gas for cold test runs. The experimental investigations have been carried out for different radial positions. The measurement plane was located 0.2mm to 0.5mm downstream of the trailing edge (trailing edge width 1.6mm).

Local regions of high anisotropic turbulence were detected in the mixing zone. For low blowing ratios, the trailing edge pressure side in the tip vicinity was found to be subjected to direct hot gas contact. The trailing edge ejection has an influence of at least one chordlength in axial direction.

The experimental investigations were accompanied by 3-D Navier-Stokes computational simulations. The calculated velocity distributions were found to be quite consistent with the experimental results. The calculated flow angles differed locally from the measurements. This may be due to the turbulence model employed.

Copyright © 1996 by ASME
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