Three-Dimensional Calculations of the Flow Field around a Turbine Blade with Film Cooling Injection near the Leading Edge |
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Authors: | GS Theodoridis D Lakehal W Rodi |
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Institution: | (1) Institute for Hydromechanics, University of Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany |
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Abstract: | Injection of coolant air from a showerhead injection system at the leading edge of a high pressure turbine blade is investigated
using a fully implicit three-dimensional finite-volume method on multi-block grids. For various blowing rates, the calculation
results for the velocity and pressure fields and turbulence intensity are compared with available experimental data. The present
method yields excellent agreement with the experiments for the isentropic Mach number distributions on the blade surface.
The standardk–ε turbulence model with wall functions is already capable of capturing the major details of the flow field including the
injection-induced secondary-flow vortices, particularly so on the suction side. On the pressure side, however, the lateral
jet spreading is under-predicted somewhat together with an exaggeration of the near-wall sink-flow vortices. On this side
with convex walls, where turbulence anisotropy is appreciable according to the experiments, overall better predictions were
obtained with the anisotropy correction of Bergeles et al. 23] promoting the Reynolds stress in the lateral direction. The
correction has no beneficial effect on the suction side with concave walls where the turbulence anisotropy was observed to
be much smaller.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | film cooling showerhead injection velocity field computational fluid mechanics turbulence modelling |
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