J0501-1-4 ランダムフーリエモードに基づく冷却孔モデルを用いたフィルム冷却の数値解析([J0501-1]流体機械の研究開発におけるEFD/CFD(1))

概要

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Film coolant on gas turbine's vanes and blades is subject to strong turbulent flows containing secondary flows, such as horseshoe vortex, passage vortex, etc. In general, internal flow passage should be included in the numerical domain to give accurate velocity fields at the film-hole exit, which are mandatory for reasonable prediction of the external coolant flows. But it is unrealistic to apply this technique to the LES of realistic cascade flows with multiple film cooling holes. This paper proposes a film-hole model for LES, which is based on random Fourier modes to imitate instantaneous and statistical turbulent flow properties at the film-hole exit without simultaneous analysis in the internal flow passage. The predicted time-mean film cooling effectiveness is compared with experimental data.
2010-09-04