Experimental Study of Impingement Effusion-Cooled Double-Wall Combustor Liners: Thermal Analysis

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 have been acquired to assess thermal aerodynamic behavior of setup using new, scaled up, engine-similar test rig. Similarity includes Reynolds, Nusselt, Biot numbers coolant flow. Different geometrical setups are studied by varying cavity height between two walls relative alignment patterns several different blowing ratios. This article focuses on performance setup. temperature data infrared systems either specimen. In addition effectiveness evaluations, finite element simulations performed, yielding locally resolved heat fluxes. Results three heights longitudinal specimen alignments. results show that total can achieve values as high 90% mainly influenced coverage. Impingement has small influence overall effectiveness, area located upstream where not built up completely. analyzed geometric variations major flow transfer. Small cavities lead constrained local Nusselt numbers, while larger more equalized number distributions. present misalignment shows especially heights. largest height, in general, showed decrease transfer due reduced jet momentum.