ASSEMBLY FOR A TURBOMACHINE COMPRISING A COMBUSTOR, AN OUTER CASING AND A HIGH PRESSURE PLENUM

A combustor (50) for a turbomachine includes a head end (72), a liner (66) at least partially defining a hot gas path, and a flow sleeve (68) circumferentially surrounding at least a portion of the liner (66). The flow sleeve (68) is spaced from the liner (66) to form a cooling flow annulus (90) therebetween. The cooling flow annulus (90) is in direct fluid communication with a high pressure plenum (58), whereby air from the high pressure plenum flows into the cooling flow annulus (90) and from the cooling flow annulus (90) to the head end (72). The combustor (50) further includes a first combustion zone and a second combustion zone downstream of the first combustion zone along the hot gas path (32, 70). A plurality of fuel injectors (84) are in fluid communication with the second combustion zone and are not in direct fluid communication with the high pressure plenum (58).