Abstract
To understand the mixing phenomena o film cooling air with mainstream hot gas is very important to attain higher film cooling effectiveness. But the mixing process of film cooling air with mainstream hot gas is extremely complicated. Detailed mixing of film cooling air injected through typical conventional and shaped film cooling holes with mainstream has been studied experimentally. Acetone Laser-induced Fluorescence (LIF) was used to measure film cooling effectiveness. The experimental results were compared with numerical analysis. For the process of numerical solution of flow equations, the standardκ-emodel with wall functions was implemented as the turbulence model. Numerical analysis could predict the distribution of film cooling effectiveness well, but in the near-wall region of downstream of film cooling holes it overpredicted the value of film cooling effectiveness. Acetone LIF was proved to be a powerful measurement method of mixing flow field and to be applicable for the verification of numerical analysis.
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