Air system for aircraft powerplant

A powerplant for an aircraft, comprising:

• a compressor section;
• a combustor section comprising a combustor and a diffuser plenum surrounding the combustor;
• a turbine section;
• a core flowpath extending axially along an axis through the compressor section, the combustor section and the turbine section, the core flowpath comprising the diffuser plenum;
• and
• an air system including an air circuit and a heat exchanger, the air circuit extending axially from a circuit inlet, through the heat exchanger, to a circuit outlet, the circuit inlet fluidly coupling the air circuit to the diffuser plenum, and the circuit outlet fluidly coupling the air circuit to the core flowpath in the compressor section;
• the air system configured to bleed compressed air from the diffuser plenum through the circuit inlet, cool the compressed air using the heat exchanger to provide cooled air, and direct the cooled air into the core flowpath through the circuit outlet;
• wherein the compressor section includes an array of compressor vanes and an array of compressor blades, the array of compressor blades being disposed axially upstream of and next to the array of compressor vanes along the core flowpath;
• and
• wherein the circuit outlet is disposed axially along an outer peripheral boundary of the core flowpath between the array of compressor blades and the array of compressor vanes.

A powerplant for an aircraft, comprising:

• a compressor section;
• a combustor section comprising a combustor;
• a turbine section;
• a core flowpath extending axially along an axis through the compressor section, the combustor section and the turbine section;
• and
• an air system including an air circuit and a heat exchanger, the air circuit extending axially from a circuit inlet, through the heat exchanger, to a circuit outlet, the circuit inlet fluidly coupling the air circuit to the core flowpath at an inlet location disposed along the core flowpath axially upstream of the combustor, the circuit outlet fluidly coupling the air circuit to the core flowpath at an outlet location disposed along the core flowpath axially upstream of the inlet location, the circuit outlet comprising a plurality of outlet orifices arranged circumferentially about the axis in an array, the air circuit including a manifold and a plurality of outlet legs, the manifold extending circumferentially around the axis, the plurality of outlet legs arranged circumferentially about the axis in an array, and each of the plurality of outlet legs projecting out from the manifold to a respective one of the plurality of outlet orifices;
• the air system configured to bleed compressed air from the core flowpath through the circuit inlet, cool the compressed air using the heat exchanger to provide cooled air, and direct the cooled air into the core flowpath through the plurality of outlet orifices;
• wherein the compressor section includes an array of compressor vanes and an array of compressor blades, the array of compressor blades being disposed axially upstream of and adjacent the array of compressor vanes along the core flowpath;
• and
• wherein the circuit outlet is disposed axially along an outer peripheral boundary of the core flowpath between the array of compressor blades and the array of compressor vanes.