Eductor exhaust silencer assembly with bypass gasflow
AssigneeUnited Technologies Corporation
InventorsJay M. Francisco, Anthony C. Jones, Greg R. Giddings, Nagamany Thayalakhandan, Jason Peel
Life of this patent
Estimating the term…
Abstract
An exhaust silencer assembly for use with an auxiliary power unit includes an eductor and a discharge pipe. The eductor is disposed downstream of the auxiliary power unit and has an entrance opening at a forward axial end thereof. The entrance opening is configured to receive exhaust airflow from the auxiliary power unit. The discharge pipe extends from the auxiliary power unit and communicates with the exhaust silencer assembly downstream of the entrance opening of the eductor.
Claims17
An exhaust silencer assembly, comprising:
- an eductor disposed downstream of an auxiliary power unit and including an entrance opening at a forward axial end thereof, the entrance opening configured to receive exhaust airflow from the auxiliary power unit;
- an acoustic-attenuating porous liner disposed within an interior of the eductor axially downstream of the entrance opening, the porous liner separating a radially outer plenum from a radially inner plenum of the eductor;
- a discharge pipe extending from the auxiliary power unit and communicating with the exhaust silencer assembly downstream of the entrance opening of the educator, wherein the discharge pipe extends through both an outer casing of the eductor and the porous liner;
- and
- an air inlet duct secured to the eductor and communicating with the outer plenum of the eductor via a cooling air inlet opening therein.
An assembly, comprising:
- an auxiliary power unit;
- an eductor disposed downstream of the auxiliary power unit and including an entrance opening at a forward axial end thereof, the entrance opening configured to receive exhaust airflow from the auxiliary power unit, the eductor including a cooling air inlet opening therein and an acoustic-attenuating porous liner disposed within an interior thereof;
- a discharge pipe extending from the auxiliary power unit and communicating with the eductor downstream of the entrance opening;
- and
- an air inlet duct secured to the eductor and communicating with the interior thereof via the cooling air inlet opening;
- wherein the eductor receives a by-pass airflow from the discharge pipe, a cooling airflow from the air inlet duct, and exhaust airflow from the auxiliary power unit.
An exhaust silencer assembly, comprising:
- an eductor disposed downstream of an auxiliary power unit and including an entrance opening at a forward axial end thereof, the entrance opening configured to receive exhaust airflow from the auxiliary power unit;
- an acoustic-attenuating porous liner disposed within an interior of the eductor axially downstream of the entrance opening, the porous liner separating a radially outer plenum from a radially inner plenum of the eductor;
- an exhaust duct downstream of the eductor, the exhaust duct configured to receive airflow from the eductor;
- and
- a discharge pipe extending from the auxiliary power unit and communicating with the exhaust duct downstream of the eductor.
An exhaust silencer assembly, comprising:
- an eductor disposed downstream of an auxiliary power unit including an entrance opening configured to receive exhaust airflow from the auxiliary power unit;
- an acoustic-attenuating porous liner disposed within an interior of the eductor axially downstream of the entrance opening, the porous liner separating a radially outer plenum from a radially inner plenum of the eductor;
- a cooling air inlet opening in the eductor;
- a discharge pipe extending from the auxiliary power unit and communicating with the eductor downstream of the entrance opening;
- and
- an annular by-pass plenum within the eductor, the by-pass plenum communicates with the discharge pipe.
Dependencies are inferred from the claim text.