Abstract
Abstract The development of ultra-compact combustors raises challenges regarding wall thermal management. This study aims to understand the behavior of a reacting flow interacting with a cooling air film generated by an effusion wall. Experiments are carried out in an optically-accessible test rig operating at atmospheric pressure, and generating a premixed methane/air turbulent flame. Particle image velocimetry (PIV) and OH planar-laser induced fluorescence (OH-PLIF) are implemented to assess the cold-flow topology and the flame dynamics. Results indicate that an important turbulent flow activity is present in the developing shear layer, being independent of the hole diameter. The air film creates an aspiration of the mainstream. The blowing ratio modifies the flame wrinkling, amplified by the aspiration of the air film. Changing the main equivalence ratio induces a stronger flame-cooling air film interaction. Eventually, a larger hole diameter with a constant wall porosity increases the hole-to-hole distance, enabling the reactive flow to be engulfed at the wall.
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