Pressurized-air supply unit for an air-jet cooling device

A pressurized air supply unit of an air-jet cooling device cooling an outer turbine casing of a turbomachine, this unit comprising an air delivery elbow duct and a body delimiting an enclosure, this body having an external wall and an internal wall opposite to each other extending along an axial direction, the internal wall of the body being provided with a plurality of air ejection perforations, the respective longitudinal edges of the two internal and external walls of the body meeting to define a first series of outlet ducts located on a first longitudinal side of the body and a second series of an identical number of outlet ducts located on a second longitudinal side of the body, each outlet duct being provided with an outlet opening configured to be connected to a cooling manifold of the cooling device, said air delivery elbow duct having an internal portion, an opposite external portion and two lateral portions, each lateral portion joining the internal portion to the external portion, wherein this unit is unitary, wherein said air delivery elbow duct is connected to the external wall of the body so that an outlet mouth of the air delivery elbow duct opens out into said enclosure and that its internal portion is located opposite the part of the external wall of the body which extends towards the first side of said body, and wherein the unit comprises at least one air distribution partition disposed in the outlet mouth of the air delivery duct, this air distribution partition joining an inner face of the internal portion of the air delivery elbow duct to an inner face of the external portion of the air delivery elbow duct.