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NUMERICAL AND EXPERIMENTAL RESEARCH ON A MIXING PROCESS OF FILM COOLING AIR WITH MAINSTREAM

DOI: 10.1615/IHTC13.p20.140
11 pages

T. Kumagai
Osaka University, Osaka, Japan

Kenichiro Takeishi
Department of Mechanical Engineering, Osaka University; 2-1, Yamadaoka, Suita, Osaka 5650871, Japan; Tokushima Bunri University, 1314-1, Shido, Sanuki, Kagawa 769-2193, Japan

Masaharu Komiyama
Department of Mechanical Engineering, Osaka University, Osaka, 565-0871, Japan

D. Tokunaga
Toyo Engineering Corporation, Chiba, Japan

Abstract

To understand the mixing phenomena of 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. Film cooling air injected through discrete holes has been studied experimentally. Also, Computational Fluid Dynamics (CFD) has been conducted to solve the flow field of film cooling. In this experiment, heat/mass transfer analogy was applied and acetone Laser-induced Fluorescence (LIF) was used to measure film cooling effectiveness. Three-dimensional spatial distributions of film cooling air injected into the boundary layer on flat surface were investigated by using a low-speed wind tunnel. Detailed mixing flow fields of film cooling air blowing through typical conventional and shaped film cooling holes with mainstream were measured by acetone LIF. Also, the experimental results measured by acetone LIF were compared with CFD predictions. For the process of numerical solution of flow equations, the standard k-ε model with wall functions was implemented as the turbulence model. CFD predictions could predict distribution of film cooling effectiveness well, but in the near-wall region of downstream of the film cooling hole it overpredicted the value of film cooling effectiveness. Acetone LIF was a powerful measurement method of mixing flow field and was applied to the verification of numerical analysis.

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Measurement of fluid temperature with an arrangement of three thermocouples