Turbomachine nozzle cowl having jet noise suppression pattern, corresponding nozzle and turbomachine

摘要

The cowl (14) has a set of quadrilateral shaped repetitive patterns (26) arranged in extension of a trailing edge (14a) and circumferentially spaced from one another, where the cowl is of cylindrical/tapered shape. Each pattern has two peaks (30a, 30b) that are spaced towards downstream of a base (28) and are connected to the base by parabola shaped sides (32a, 32b). Each pattern is asymmetric with respect to a median plane (P) passing via a longitudinal axis of the cowl. Each pattern has portions (34a, 34b) inclined radially towards the interior and the exterior of the cowl, respectively.