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A Comprehensive Investigation of Pre-Swirled Flow Through Rotating Radial Holes

[+] Author Affiliations
Daniel Riedmüller, Jan Sousek, Michael Pfitzner

Universität der Bundeswehr München, Neubiberg, Germany

Paper No. GT2014-25102, pp. V05CT16A003; 14 pages
doi:10.1115/GT2014-25102
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

This paper reports on the flow (centrifugal = radially outwards, centripetal = radially inwards) through rotating radial orifices with and without pre-swirl in the flow approaching the orifice in the outer annulus. The aerodynamical behavior of flow through radial rotating holes is different from the one through axial and stationary holes due to the presence of centrifugal and Coriolis forces. To investigate the flow phenomena and the discharge coefficient of these orifices in detail, an existing test rig containing two independently rotating shafts (co- and counter rotating) was used. To simulate conditions of real gas turbines, where the flow is often influenced by upstream components, various pre-swirl angles were used in the test rig. Measurements of the flow discharge coefficient in both flow directions through the orifices (centripetal and centrifugal), with and without pre-swirl generation in the outer annulus, are presented at various flow conditions (pressure ratios across orifices, Mach numbers of approaching flow) and for different geometric parameters (length to diameter ratios, sharp/rounded inlet edges). Flow effects, that occur with pre-swirled flow are clarified. A comparison of the experimental data, for both flow directions, shows a similar behavior of the discharge coefficients with increasing shaft speeds. To supplement the experimental data and to better understand the experimental findings, numerical simulations were performed, which show a good agreement with the experimental results. Furthermore, an optimization model with complete automatic grid generation, CFD simulation and post-processing, was built to enable large parametric studies e.g. grid independence of the solutions.

Copyright © 2014 by ASME
Topics: Flow (Dynamics)

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