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RESEARCH PAPERS

Investigation of the Flow Field Downstream of a Turbine Trailing Edge Cooled Nozzle Guide Vane

[+] Author and Article Information
C. H. Sieverding, T. Arts, R. Dénos

von Karman Institute for Fluid Dynamics, Rhode-Saint-Genèse, Belgium

F. Martelli

University of Florence, Florence, Italy

J. Turbomach 118(2), 291-300 (Apr 01, 1996) (10 pages) doi:10.1115/1.2836639 History: Received February 19, 1994; Online January 29, 2008

Abstract

A trailing edge cooled low aspect ratio transonic turbine guide vane is investigated in the VKI Compression Tube Cascade Facility at an outlet Mach number M 2, is = 1.05 and a coolant flow rate ṁc/ṁg = 3 percent. The outlet flow field is surveyed by combined total-directional pressure probes and temperature probes. Special emphasis is put on the development of low blockage probes. Additional information is provided by oil flow visualizations and numerical flow visualizations with a three-dimensional Navier–Stokes code. The test results describe the strong differences in the axial evolution of the hub and tip endwall and secondary flows and demonstrate the self-similarity of the midspan wake profiles. According to the total pressure and temperature profiles, the wake mixing appears to be very fast in the near-wake but very slow in the far-wake region. The total pressure wake profile appears to be little affected by the coolant flow ejection.

Copyright © 1996 by The American Society of Mechanical Engineers
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