Abstract
Measurements of film cooling effectiveness are presented for coolant injection through a single hole and rows of holes with pitch to diameter ratios of 8.0, 5.33 and 2.67 with an injection angle of 30° to the free stream flow direction. In the case of a row of holes with a pitch to diameter ratio of 5.33 the influence on film cooling of injecting a small fraction of the coolant through narrow slits located three diameters downstream from the row of holes is investigated and is found to be significant. Also the effects of free stream turbulence and velocity gradient are measured and in general increased free stream turbulence reduces film cooling effectiveness, whereas, the influence of free stream velocity gradient differs for two and three dimensional flow situations. The measurements are analysed via line sink models and correlations based on an energy balance, the latter are much more successful in describing the film cooling effectiveness measurements.
Published Version
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