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Experimental Study on Pressure Losses in Circular Orifices for the Application in Internal Cooling Systems

[+] Author Affiliations
Christian Binder, Mats Kinell, Esa Utriainen, Daniel Eriksson, Mehdi Bahador

Siemens Industrial Turbomachinery AB, Finspång, Sweden

Johannes Kneer, Hans-Jörg Bauer

Karlsruhe Institute of Technology, Karlsruhe, Germany

Paper No. GT2014-25619, pp. V05CT16A015; 10 pages
doi:10.1115/GT2014-25619
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4573-8
  • Copyright © 2014 by ASME

abstract

The cooling air flow in a gas turbine is governed by the flow through its internal passages and controlled by restrictors such as circular orifices. If the cooling air flow is incorrectly controlled, the durability and mechanical integrity of the whole turbine may be affected. Consequently, a good understanding of the orifices in the internal passages is important. This study presents experimental results for a range of pressure ratios and length-to-diameter ratios common in gas turbines including even very small pressure ratios. Additionally, the chamfer depth at the inlet was also varied. The results of the chamfer depth variation confirmed its beneficial influence on decreasing pressure losses. Moreover, important effects were noted when varying more than one parameter at a time. Besides earlier mentioned hysteresis at the threshold of choking, new phenomena were observed, e.g. a rise of the discharge coefficient for certain pressure and length-to-diameter ratios. A correlation for the discharge coefficient was attained based on the new experimental data with a generally lower error than previous studies.

Copyright © 2014 by ASME

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