Article thumbnail

EFFECTS OF CROSSFLOW IN AN INTERNAL-COOLING CHANNEL ON FILM COOLING OF A FLAT PLATE THROUGH COMPOUND-ANGLE HOLES

By Zachary Taylor Stratton

Abstract

The film-cooling holes in turbine blades are fed from an internal cooling channel. This channel imposes a crossflow at the entrance of the holes that can significantly affect the performance of the cooling jets that emanate from those holes. In this study, CFD simulations based on steady RANS with the shear-stress transport (SST) and the realizable k -ε turbulence models were performed to study film cooling of a flat plate with cooling jets issuing from eight round holes with a compound angle of 45 degrees, where the coolant channel that fed the cooling jets was oriented perpendicular to the direction of the hot-gas flow. One case was also performed by using large-eddy simulation (LES) to get a sense of the unsteady nature of the flow. Operating conditions were chosen to match the laboratory conditions, which maintained a density ratio of 1.5 between the coolant and the hot gas. Parameters studied include internal crossflow direction and blowing ratios of 0.5, 1.0, and 1.5. Results obtained showed an unsteady vortex forms inside the hole, causing a side-to-side shedding of the coolant jet. Values of adiabatic effectiveness predicted by the CFD simulations were compared with experimentally measured values. Steady RANS was found to be inconsistent in its ability to predict adiabatic effectiveness with relative error ranging from 10% to over 100%. LES was able to predict adiabatic effectiveness with reasonable accuracy

Topics: Applied sciences, Bogard, CFD, Compound angle, Film cooling, Internal crossflow, Powerflow, Aerospace Engineering
Publisher: 'Purdue University (bepress)'
Year: 2014
OAI identifier: oai:docs.lib.purdue.edu:open_access_theses-1289
Provided by: Purdue E-Pubs
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://docs.lib.purdue.edu/op... (external link)
  • https://docs.lib.purdue.edu/cg... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.