Aircraft with environmental control system
An aircraft includes 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, and a turbo air cycle machine. The turbo air cycle machine includes a compressor fluidly coupled to the low pressure bleed air supply, as well as a turbine fluidly coupled to at least one of the low pressure bleed air supply or the high pressure bleed air supply.
1. An aircraft comprising:
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 and compressor sections;
a controllable valve assembly configured to selectively fluidly couple the low pressure bleed air supply to the compressor section, the low pressure bleed air supply to the turbine section, and the high pressure bleed air supply to the turbine section; and
a turbo-ejector fluidly combining fluid outputs from the turbine and compressor sections into a common flow that is supplied to the bleed air inlet of the environmental control system,
wherein the low pressure bleed air supply includes a first low pressure bleed air supply directly fluidly coupled to the compressor section and a second low pressure bleed air supply fluidly coupling the first low pressure bleed air supply to the high pressure bleed air supply,
wherein the controllable valve assembly further comprises:
a first controllable valve provided along the first low pressure bleed air supply upstream of the second low pressure bleed air supply;
a second controllable valve provided along the high pressure bleed air supply; and
a check valve provided along the second low pressure bleed air supply.
2. The aircraft of claim 1 , wherein the environmental control system comprises an air-conditioning subsystem and a de-icing subsystem.
3. The aircraft of claim 1 wherein the controllable valve assembly is configured to simultaneously supply the low pressure bleed air supply to the compressor section and to the high pressure bleed air supply.
4. The aircraft of claim 1 , further comprising a controller module configured to controllably operate at least one of the controllable valve assembly or the turbo-ejector.
5. The aircraft of claim 1 , wherein the controllable valve assembly is configured to selectively supply a combination of the low pressure bleed air supply and the high pressure bleed air supply to the turbine section.
6. An aircraft comprising:
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 fluidly coupled to the bleed air inlet and comprising:
a compressor selectively fluidly coupled to the low pressure bleed air supply and having a compressor outlet emitting a compressed air stream; and
a turbine selectively fluidly coupled the low pressure air supply and selectively fluidly coupled to the high pressure bleed air supply and having a turbine outlet emitting a cooled air stream; and
a turbo-ejector fluidly coupled to the compressor outlet and the turbine outlet,
wherein the low pressure bleed air supply includes a first low pressure bleed air supply directly fluidly coupled to the compressor and a second low pressure bleed air supply fluidly coupling the first low pressure bleed air supply to the high pressure bleed air supply,
wherein the aircraft further comprises a controllable valve assembly upstream of the turbo air cycle machine and configured to selectively fluidly couple the first low pressure bleed air supply to the compressor and the second low pressure bleed air supply, and the high pressure bleed air supply to the turbine, and
wherein the controllable valve assembly comprises:
a first controllable valve provided along the first low pressure bleed air supply upstream of the second low pressure bleed air supply;
a second controllable valve provided along the high pressure bleed air supply; and
a check valve provided along the second low pressure bleed air supply.
7. The aircraft of claim 6 , wherein the turbo-ejector further comprises a first inlet, a second inlet, and an outlet, with the second inlet having a narrow portion forming a throat.
8. The aircraft of claim 7 , wherein the turbine outlet is fluidly coupled to the first inlet, and the compressor outlet is fluidly coupled to the second inlet.
9. The aircraft of claim 8 , wherein the compressed air stream and the cooled air stream combine within the turbo-ejector to form a conditioned air stream exiting the turbo-ejector through the outlet.
10. The aircraft of claim 9 , wherein the outlet of the turbo-ejector is fluidly coupled to the bleed air inlet, thereby supplying the conditioned air stream to the environmental control system.
11. The aircraft of claim 9 , further comprising a controller module in signal communication with the environmental control system and the turbo air cycle machine.
12. The aircraft of claim 11 , wherein the controller module is configured to receive a signal indicative of a bleed air demand for the environmental control system, and to supply proportional amounts of the low pressure bleed air supply and the high pressure bleed air supply to form the conditioned air stream meeting the bleed air demand.
13. The aircraft of claim 6 , wherein the environmental control system comprises an air-conditioning subsystem and a de-icing subsystem.