US 12,158,103 B1Granted

Cooling flow injection to alter exhaust boundary conditions in a turbo-compounded engine

AssigneePratt & Whitney Canada Corp.

InventorSid-Ali Meslioui

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Abstract

A turbo-compounded engine includes a piston engine connected to drive a propulsor. An outlet of the piston engine is operable to connect products of combustion from the piston engine to pass over a turbine. The turbine is connected to drive a turbine shaft also providing rotation to the propulsor. An outlet of the turbine is connected into an exhaust duct configured to exhaust the products of combustion. The exhaust duct is provided with an exhaust duct outer wall defining an exhaust chamber, and a further cooling air outer wall is positioned outwardly of the exhaust duct. Struts connect a cooling chamber between the cooling air outer wall and the exhaust duct outer wall into a center bullet. The center bullet has a downstream end for directing the cooling air into the exhaust chamber at a location upstream of a downstream end of the exhaust duct outer wall.

Claims19

Dependent claims

A turbo-compounded engine comprising:

a piston engine connected to drive a propulsor, an outlet of the piston engine being operable to connect products of combustion from the piston engine to pass over a turbine, the turbine being connected to drive a turbine shaft also providing rotation to the propulsor;
an outlet of the turbine is connected into an exhaust duct configured to exhaust the products of combustion, the exhaust duct being provided with an exhaust duct outer wall defining an exhaust chamber, and a further cooling air outer wall positioned outwardly of the exhaust duct;
a center bullet received within the exhaust chamber inwardly of the exhaust duct outer wall, and struts connecting a cooling chamber between said cooling air outer wall and said exhaust duct outer wall into the center bullet, the center bullet having a downstream end for directing a cooling air into the exhaust chamber at a location upstream of a downstream end of the exhaust duct outer wall;
within the center bullet there is a flow divider defining a plurality of passages;
and
wherein the exhaust duct outer wall has a first generally axially extending portion extending axially away from the engine with a first component in an axial direction defined by a rotational axis of the engine, and the first component in the axial direction being greater than a radial component of the first generally axially extending portion, the first generally axially extending portion merging into a radially extending portion, and the radially extending portion merging into a second generally axially extending portion extending along a direction with a second component in the axial direction that is greater than a radial component of the second component of the second generally axially extending portion and the radially extending portion extending with a third component in the axial direction but also having a radial component of the radially extending portion that is greater than the radial component in both the first axially extending portion and the second axially extending portion.

3 more elements

A turbo-compounded engine comprising:

a piston engine connected to drive a propulsor, an outlet of the piston engine being operable to connect products of combustion from the piston engine to pass over a turbine, the turbine being connected to drive a turbine shaft also providing rotation to the propulsor;
an outlet of the turbine is connected into an exhaust duct configured to exhaust the products of combustion, the exhaust duct being provided with an exhaust duct outer wall defining an exhaust chamber, and a further cooling air outer wall positioned outwardly of the exhaust duct;
a center bullet received within the exhaust chamber inwardly of the exhaust duct outer wall, and struts connecting a cooling chamber between said cooling air outer wall and said exhaust duct outer wall into the center bullet, the center bullet having a downstream end for directing a cooling air into the exhaust chamber at a location upstream of a downstream end of the exhaust duct outer wall;
wherein the exhaust duct outer wall has a first generally axially extending portion extending axially away from the engine with a first component in an axial direction defined by a rotational axis of the engine, and the first component in the axial direction being greater than a radial component of the first generally axially extending portion, the first generally axially extending portion merging into a radially extending portion, and the radially extending portion merging into a second generally axially extending portion extending along a direction with a second component in the axial direction that is greater than a radial component of the second component of the second generally axially extending portion and the radially extending portion extending with a third component in the axial direction but also having a radial component of the radially extending portion that is greater than the radial component in both the first axially extending portion and the second axially extending portion.

1 more element

A turbo-compounded engine comprising:

a piston engine connected to drive a propulsor, an outlet of the piston engine being operable to connect products of combustion from the piston engine to pass over a turbine, the turbine being connected to drive a turbine shaft also providing rotation to the propulsor;
an outlet of the turbine is connected into an exhaust duct configured to exhaust the products of combustion, the exhaust duct being provided with an exhaust duct outer wall and defining an exhaust chamber, and a further cooling air outer wall positioned outwardly of the exhaust duct;
a center bullet received within a chamber inwardly of the exhaust duct outer wall, and struts connecting a cooling chamber between said cooling air outer wall and said exhaust duct outer wall into the center bullet, the center bullet having a downstream end for directing a cooling air into the exhaust chamber at a location upstream of a downstream end of the exhaust duct outer wall;
wherein the exhaust duct outer wall has a first generally axially extending portion extending axially away from the engine with a first component in an axial direction defined by a rotational axis of the engine, and the first component in the axial direction being greater than a radial component of the first generally axially extending portion, the first generally axially extending portion merging into a radially extending portion, and the radially extending portion merging into a second generally axially extending portion extending along a direction with a second component in the axial direction that is greater than a radial component of the second component of the second generally axially extending portion and the radially extending portion extending with a third component in the axial direction but also having a radial component of the radially extending portion that is greater than the radial component in both the first axially extending portion and the second axially extending portion;
wherein there are axially spaced sets of the struts delivering cooling air into the center bullet;
and
wherein there are a plurality of passages within the center bullet.

4 more elements

Dependencies are inferred from the claim text.