J0501-2-3 タービン翼前縁モデルによるシャワーヘッド冷却CFD解析の実験的検証(流体機械の研究開発におけるEFD/CFD(2))

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The present paper presents validation results of CFD for showerhead film-cooling on the leading edge model simulating a gas turbine blade. A wind tunnel tests were conducted by using a large-scaled semi-circular model for a typical blade leading edge with circular cooling holes. The temperature distributions were measured by thermochromic liquid crystal and a comb-like thermo-probe consisting of a number of thermocouples. In regard to the CFD, Detached-Eddy Simulation (DBS) and unsteady RANS calculations by using the Spallart and Allmaras one-equation turbulence model were applied to solve convective heat transfer on the same model as the experiments. As a result, variation in the wall distribution of the adiabatic effectiveness with blowing ratio was clarified by the measurements. Spatial-averaged profiles of adiabatic effectiveness on the wall predicted by both calculations show reasonable agreement with the measurements. The DBS appears to be more valid in local distributions of the effectiveness than the URANS calculation.
2009-09-12