APU exhaust system
AssigneeUnited Technologies Corporation
InventorsEric Andrew Nager, James C. Napier, Farooq Rehman, Anthony C. Jones
Life of this patent
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Abstract
An exhaust system for an APU in a gas turbine engine aircraft having a tail cone in which exhaust noise is reduced. An APU exhaust liner is attached to the APU and extending to an oval cutout at the tail cone The liner has a first constant cross section from the APU to a point proximate the tail cone, and a second, increasing cross section from the point proximate the tail cone to the liner cutout. The liner is turned toward the side of the tail. The liner cutout is further enlarged with at least one larger cutout.
Claims18
An exhaust system for an auxiliary power unit (APU) in tail cone section of an aircraft, the exhaust system comprising:
- an exhaust outlet on a side of the tail cone section;
- an APU exhaust liner attached to the APU and extending rearward from the APU to the exhaust outlet, the liner having a first section with a constant cross section from the APU to a point proximate the tail cone;
- and the liner having a second, larger diameter continuously increasing cross section from the downstream end of the first section to the outlet.
A method for reducing the exhaust noise in an auxiliary power unit (APU) in a gas turbine engine aircraft having a tail cone, the method comprising:
- receiving exhaust gas at a liner inlet adjacent the APU;
- directing the exhaust gas through the liner from the liner inlet to an outlet in a side surface of a fuselage tail section;
- and
- reducing the velocity of the exhaust gas in the liner before it exits the outlet in a region of the liner proximate the outlet by expanding the cross section of the liner and turning the enlarged liner to meet the outlet in a side surface of a fuselage tail section.
An exhaust liner for an APU in a gas turbine engine aircraft having a tail cone ending with an outlet for discharging exhaust, the liner comprising:
- a first section in the liner with a constant cross section from the APU to a point proximate the tail cone;
- and
- a second, larger diameter in the liner with a continuously increasing cross section from the downstream end of the first section to the outlet of the liner at the tail cone.
Dependencies are inferred from the claim text.