Parametric experimental study on high porosity film cooling features on turbine blade geometries

Authors

Augustin Wambersie  - University of Oxford Thermofluids Institute, United Kingdom
Peter Ireland - University of Oxford Thermofluids Institute, United Kingdom

Abstract

High porosity cooling features have shown promise with regards to improving turbine blade film effectiveness. However, little is still known with regards to what features and parameters are necessary in order for the desired effects to be achieved. This paper examines a wide range of parameters in order to gain a better understanding of high porosity film cooling features. Blowing ratio, hole size, panel length and injection angles are all tested and compared in order to examine the sensitivity to such variables.   Experiments are carried out using Pressure sensitive paint within a high speed linear cascade at engine representative conditions. Results indicate the significance of low blowing ratios and hole size, as well as a relative insensitivity to injection angles.