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Numerical Investigation of Transient Heat Transfer Experiments Under Rotation

[+] Author Affiliations
Michael Goehring, Christopher Hartmann, Jens von Wolfersdorf

University of Stuttgart, Stuttgart, Germany

Paper No. GT2018-76497, pp. V05AT11A011; 12 pages
doi:10.1115/GT2018-76497
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 5A: Heat Transfer
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5108-1
  • Copyright © 2018 by ASME

abstract

A smooth two-pass internal gas turbine cooling channel is numerically investigated. Transient conjugated non-rotating and rotating URANS simulations are executed. The transient thermochromic liquid crystal (TLC) approach is supported with these simulations as the temporally changing rotational buoyancy effects can be examined. The Reynolds number is 25,000, the rotation number is 0.24 and the initial buoyancy number is 0.63 (according to an inlet-to-wall density ratio of 0.23). As heat is transferred, the temperatures and heat fluxes change with increasing time, and so do the local buoyancy effects. The computational results are evaluated as averaged segmental values. They are compared to the experimental results from literature that have been determined for constant wall temperature experiments (various experimental runs with different constant wall temperatures). Especially in the first passage, there is a good agreement between the numerically gained results and the experimental data. The more complex flow inside the bend leads to more diverse characteristics and the second passage is only slightly effected.

Copyright © 2018 by ASME

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