High resolution PIV measurements around a model turbine blade trailing edge film-cooling breakout |
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Authors: | Yude Chen Claude G Matalanis John K Eaton |
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Institution: | (1) Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA |
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Abstract: | Film cooling downstream of a model turbine blade trailing edge has been studied experimentally. High resolution particle image
velocimetry was used to obtain spatially resolved mean velocity and turbulence measurements in the immediate vicinity of the
trailing edge breakout. The mean velocity measurements imply the presence of a pair of counter-rotating longitudinal vortices
shed from the sides of the breakout lands. The turbulent shear stress measurements above the breakout are significantly intensified
as blowing ratio is increased. These results suggest that there is a strong mixing between the film cooling slot jets and
the mainstream flow which degrades the film cooling effectiveness. |
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