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US 5,555,730 AGranted
Cooling for gas turbine-two stroke piston compound engine
AssigneeHaeco Partners, Ltd.
InventorJack I. Hope
Life of this patent
Estimating the term…
Abstract
A compound engine that includes a gas turbine unit and a piston unit wherein a portion of the cycle air for the piston unit is diverted through cooling passages to provide impingement cooling of several areas of the piston unit including the upper cylinder area, the outer and inner surfaces of the exhaust valve and other selected areas of the cylinder head; and there after, the diverted cycle air is reintroduced into the cycle.
Claims30
A compound engine comprising:
- a gas turbine unit including
- a compressor receiving ambient air for providing cycle air,
- a thermal reactor receiving the cycle air and providing cycle air to first and second outlets of the thermal reactor,
- a first turbine connected to and driving the compressor, the first turbine receiving cycle gas from the second outlet of the thermal reactor, and
- a second turbine having an input fluidly coupled to an output of the first turbine;
- and
- a piston unit including
- an intake manifold in fluid communication with the first outlet of the thermal reactor,
- an exhaust manifold in fluid communication with the second outlet of the thermal reactor,
- a crankshaft mechanically coupled to the second turbine,
- a plurality of piston and cylinder assemblies, each of the plurality of piston and cylinder assemblies including
- a cylinder bore surrounded by a cylinder wall,
- a piston slidably mounted in the cylinder bore and having annular piston rings in sliding contact with the cylinder wall, the piston having one end operatively connected to the crankshaft for reciprocating motion within the cylinder bore,
- an intake port in fluid communication with the intake manifold, the intake port being located in the cylinder wall proximate a bottom dead center position of a respective piston,
- a first plurality of impingement cooling holes having
- first ends in fluid communication with the intake manifold for receiving cycle air, and
- second ends expelling and impinging cycle air at a high velocity on an outer area of a respective cylinder wall at a first location generally adjacent the piston rings of a respective piston located at a top dead center position.
14 more elements
A compound engine comprising:
- a gas turbine unit including
- a compressor receiving ambient air for providing cycle air,
- a thermal reactor receiving the cycle air and providing cycle gas to first and second outlets of the thermal reactor,
- a first turbine connected to and driving the compressor, the first turbine receiving cycle gas from the second outlet of the thermal reactor, and
- a second turbine having an input fluidly coupled to an output of the first turbine;
- and
- a piston unit including
- an intake manifold in fluid communication with the second outlet of the thermal reactor,
- an exhaust manifold in fluid communication with the first outlet of the thermal reactor,
- a crankshaft mechanically coupled to the second turbine,
- a plurality of piston and cylinder assemblies, each the plurality of piston and cylinder assemblies including
- a piston operatively connected to the crankshaft,
- a hollow cylindrical exhaust valve mounted concentrically with respective piston within a bore at one end of the piston and cylinder assembly, the exhaust valve reciprocating between alternating open and closed positions,
- a first sealing ring located in the bore and in contact with an outer surface of the reciprocating exhaust valve,
- a cylindrical center body member mounted within the reciprocating hollow cylindrical exhaust valve, the cylindrical center body having one end bounding a portion of a combustion chamber,
- a second sealing ring mounted in an outside surface of the center body and in contact with an inner surface of the reciprocating exhaust valve,
- a first plurality of impingement cooling holes having
- first ends in fluid communication with the intake manifold for receiving cycle air, and
- second ends expelling and impinging cycle air at a high velocity on the outer surface of the exhaust valve between the first sealing ring and a distal end of the exhaust valve proximate the piston.
16 more elements
A compound engine comprising:
- a gas turbine unit including
- a compressor receiving ambient air for providing cycle air,
- a thermal reactor receiving the cycle air and providing cycle gas to first and second outlets of the thermal reactor,
- a first turbine connected to and driving the compressor, the first turbine receiving cycle gas from the second outlet of the thermal reactor, and
- a second turbine having an input fluidly coupled to an output of the first turbine;
- and
- a piston unit including
- an intake manifold in fluid communication with the first outlet of the thermal reactor,
- an exhaust manifold in fluid communication with the second outlet of the thermal reactor,
- a crankshaft mechanically coupled to the second turbine,
- a plurality of piston and cylinder assemblies, each of the plurality of piston and cylinder assemblies including
- a cylinder bore surrounded by a cylinder wall,
- a piston slidably mounted in the cylinder bore and having one end operatively connected to the crankshaft for reciprocating motion within the cylinder bore,
- a hollow cylindrical exhaust valve slidingly mounted in the respective piston and cylinder assembly, the exhaust valve reciprocating between open and closed positions,
- a cylindrical center body member mounted within and in a sliding relationship with respect to the reciprocating hollow cylindrical exhaust valve, the cylindrical center body having one end bounding a portion of a combustion chamber,
- a first plurality of impingement cooling holes having
- first ends in fluid communication with the intake manifold for receiving cycle air, and
- second ends expelling high velocity cycle air impinging on an internal surface of the center body member.
15 more elements
Dependencies are inferred from the claim text.