An Infrared Technique for Evaluating Turbine Airfoil Cooling Designs
- 1 February 1999
- journal article
- Published by ASME International in Journal of Turbomachinery
- Vol. 122 (1), 170-177
- https://doi.org/10.1115/1.555438
Abstract
An experimental approach is used to evaluate turbine airfoil cooling designs for advanced gas turbine engine applications by incorporating double-wall film-cooled design features into large-scale flat plate specimens. An infrared (IR) imaging system is used to make detailed, two-dimensional steady-state measurements of flat plate surface temperature with spatial resolution on the order of 0.4 mm. The technique employs a cooled zinc selenide window transparent to infrared radiation and calibrates the IR temperature readings to reference thermocouples embedded in each specimen, yielding a surface temperature measurement accuracy of ±4°C. With minimal thermocouple installation required, the flat plate/IR approach is cost effective, essentially nonintrusive, and produces abundant results quickly. Design concepts can proceed from art to part to data in a manner consistent with aggressive development schedules. The infrared technique is demonstrated here by considering the effect of film hole injection angle for a staggered array of film cooling holes integrated with a highly effective internal cooling pattern. Heated free stream air and room temperature cooling air are used to produce a nominal temperature ratio of 2 over a range of blowing ratios from 0.7 to 1.5. Results were obtained at hole angles of 90 and 30 deg for two different hole spacings and are presented in terms of overall cooling effectiveness. [S0889-504X(00)01901-2]Keywords
This publication has 11 references indexed in Scilit:
- Influence of a Mixing-Jet on Film CoolingPublished by ASME International ,1997
- Mathematical Model Describing the Coupled Heat Transfer in Effusion Cooled Combustor WallsPublished by ASME International ,1997
- Film Cooling With Compound Angle Holes: Heat TransferJournal of Turbomachinery, 1996
- Effects of Free-Stream Turbulence and Surface Roughness on Film CoolingPublished by ASME International ,1996
- Effects of Surface Roughness on Film CoolingPublished by ASME International ,1996
- Application of Advanced Experimental Techniques in the Development of a Cooled Turbine NozzlePublished by ASME International ,1996
- Transonic Film-Cooling Investigations: Effects of Hole Shapes and OrientationsPublished by ASME International ,1996
- Jets in a Crossflow: Effects of Hole Spacing to Diameter Ratio on the Spatial Distribution of Heat TransferPublished by ASME International ,1991
- Film-Cooling Effectiveness in the Near-Slot RegionJournal of Heat Transfer, 1973
- On the use of a boundary-layer model for correlating film cooling dataInternational Journal of Heat and Mass Transfer, 1967