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Large-Eddy Simulations of trailing-edge cutback film cooling at low blowing ratio

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.940
12 pages

Hayder Schneider
Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (TH), Kaiserstr. 12, 76128 Karlsruhe, Germany

Dominic von Terzi
Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (TH), Kaiserstr. 12, 76128 Karlsruhe, Germany

Hans-Jorg Bauer
Institut fuer Thermische Stroemungsmaschinen (ITS), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany


For high-pressure turbine blades, an efficient cooling of the trailing edge can be achieved by ejecting a cooling film into the flow over a cutback on the pressure side of the blade. Here, results of well-resolved Large Eddy Simulations (LES) are reported that match an existing experimental setup. A low blowing ratio M = 0:5 was chosen and compared to results for an engine-typical value of 1.1. Reasonably good agreement of mean velocity profiles and adiabatic cooling effectiveness with the experimental data was obtained. By imposing either laminar or time-dependent fully turbulent channel flow profiles within the coolant channel, the LES show that the flow regime of the coolant at ejection has a significant impact on the performance of the resulting cooling film for both blowing ratios. A surprising result is that, for the low blowing ratio, a turbulent coolant enables the cooling film to sustain a larger effectiveness farther downstream compared to a laminar coolant, whereas, for M = 1:1, the opposite is the case. This may be related to the different kinds of large coherent structures that are shown to be formed for the two cases.

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