13th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Heat Transfer & Cooling
An experimental activity has been performed to study different impingement cooling schemes in static and rotating conditions. Geometry replicates a leading edge cold bridge system, including a radial supply channel and five rows of film cooling and showerhead holes. Two impingement geometries have been studied, with different number of holes and diameter but with equal overall passage area. Reynolds numbers up to 13800 and Rotation numbers up to 0.002 have been investigated (based on an equivalent slot width). Tests have been performed using a novel implementation of transient heat transfer technique, which allows to correctly replicate the sign of buoyancy forces by flowing ambient temperature air into a preheated test article. Results show that complex interactions occur between the different features of the system, with a particularly strong effect of jet supply condition. Rotation further interacts with these phenomena, generally leading to a slight decrease in heat transfer.