Experimental Study of Impingement Effusion Cooled Double-Wall Combustor Liners: Aerodynamic Analysis with Stereo-PIV

A new experimental study is presented for a combustor with double-wall cooling design. The inner wall at the hot gas side features effusion 7-7-7 laidback fan-shaped holes, and outer cold an impingement hole pattern circular holes. Data are acquired to asses thermal aerodynamic behavior of setup, using new, scaled up, engine similar test rig. Similarity includes Reynolds, Nusselt Biot numbers coolant flow. Different geometrical setups studied by varying cavity height between two walls relative alignment patterns different Reynolds numbers. This article focuses on performance setup. Instationary flow data acquired, high speed stereo PIV For each configuration, approximately 20 planes recorded rate 1000 Hz traversing region interest in specimen. fine resolution allows reconstruction 3D fields mean values extensive analysis transient phenomena plane. Time averaged jet-center plane detail. results show complex field hexagonal vortex cavity, which mainly influenced walls. jet number shows small influence when analyzing normalized data. Small heights less developed stable systems. system stability, aligned case performing better. Additionally, statistical frequency domain presented, showing damping capability especially increased heights, residual low pulsation inflow.