ENHANCED METHOD AND AIRCRAFT FOR PRE-COOLING AN ENVIRONMENTAL CONTROL SYSTEM USING A TWO WHEEL TURBO-MACHINE WITH SUPPLEMENTAL HEAT EXCHANGER
First Claim
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1. A method of providing bleed air to environmental control systems using a gas turbine engine, the method comprising:
- determining a bleed air demand for the environmental control systems;
selectively supplying low pressure bleed air and high pressure bleed air from a compressor of the gas turbine engine to a turbine section and compressor section of a turbo air cycle machine, with the turbine section emitting a cooled air stream and the compressor section emitting a compressed air stream;
selectively cooling the compressed air stream; and
combining the cooled air stream emitted from the turbine section and the compressed air stream emitted from the compressor section to form a conditioned air stream;
wherein the selectively supplying and selectively cooling are controlled such that the conditioned air stream satisfies the determined bleed air demand.
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Abstract
A method and aircraft for providing bleed air to environmental control systems of an aircraft using a gas turbine engine, including determining a bleed air demand for the environmental control systems, selectively supplying low pressure and high pressure bleed air to the environmental control systems, wherein the selectively supplying is controlled such that the conditioned air stream satisfies the determined bleed air demand.
29 Citations
20 Claims
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1. A method of providing bleed air to environmental control systems using a gas turbine engine, the method comprising:
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determining a bleed air demand for the environmental control systems; selectively supplying low pressure bleed air and high pressure bleed air from a compressor of the gas turbine engine to a turbine section and compressor section of a turbo air cycle machine, with the turbine section emitting a cooled air stream and the compressor section emitting a compressed air stream; selectively cooling the compressed air stream; and combining the cooled air stream emitted from the turbine section and the compressed air stream emitted from the compressor section to form a conditioned air stream; wherein the selectively supplying and selectively cooling are controlled such that the conditioned air stream satisfies the determined bleed air demand. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An aircraft comprising:
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an environmental control system having a bleed air inlet; a gas turbine engine having a low pressure bleed air supply and a high pressure bleed air supply; a turbo air cycle machine having rotationally coupled turbine section and compressor section; an upstream turbo-ejector fluidly coupling the low pressure bleed air supply and the high pressure bleed air supply to the turbine section and compressor section; a downstream turbo-ejector fluidly combining fluid outputs from the turbine section and compressor section into a common flow that is supplied to the bleed air inlet of the environmental control system; and a heat exchanger having a hot side fluidly coupled between the compressor section and the downstream turbo-ejector. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of providing air to an environmental control systems of an aircraft, the method comprising:
selectively supplying ambient air and low pressure bleed air and high pressure bleed air from a compressor of a gas turbine engine to a turbo air cycle machine to precondition the ambient air and bleed air according to operational demands of the environmental control systems. - View Dependent Claims (19, 20)
Specification