# US 8,769,959 B2 · Nozzle with an adjustable throat

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- Number: US 8,769,959 B2
- Document ID: US8769959B2
- Status: Granted
- Kind: B2
- Application number: 12/880,850
- Filed: 2010-09-13
- Published: 2010-12-30
- Granted: 2014-07-08
- Earliest claimed: 2006-05-04
- Assignees: ROLLS-ROYCE plc
- Applicants: Von David Baker; Baily Ramachandra Vittal
- Inventors: Von David Baker; Baily Ramachandra Vittal
- Web page: https://patentgrep.com/patent/US8769959B2

## CPC

- F02K 1/1292: {of three series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure, the internal downstream series having its flaps hinged at their upstream ends on the downstream ends of the flaps of the upstream series and at their downstream ends on the downstream ends of the flaps of the external downstream series hinged at their upstream ends on a substantially axially movable structure}
- F02K 1/16: conjointly with another control
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)

## Abstract

One embodiment of the present invention includes a nozzle defining a passage to receive and discharge working fluid to produce thrust. The nozzle includes the first wall structure opposite a second wall structure. The first wall structure includes a first convergent flap pivotally connected to a first divergent flap. The second wall structure includes a second convergent flap pivotally connected to a second divergent flap. The first wall structure and the second wall structure define the throat along the passage and are reconfigurable to adjust dimensional area of the throat. One or more control valves modulate flow of the pressurized fluid into the passage through a first opening in the first wall structure and a second opening in the second wall structure approximate to the throat to change effective area of the throat by fluidic control.

## Claims

### Claim 1

An apparatus, comprising:
a nozzle defining a passage to receive and discharge working fluid to produce thrust, the nozzle including a first wall structure opposite a second wall structure, the first wall structure including a first convergent flap pivotally connected to a first divergent flap, the second wall structure including a second convergent flap pivotally connected to a second divergent flap, the first wall structure and the second wall structure defining a throat along the passage and being reconfigurable to adjust distance across the passage at the throat; and
one or more control valves located within at least one of the first convergent flap and the second convergent flap to modulate flow of a pressurized fluid into the passage through a first opening in the first wall structure and a second opening in the second wall structure proximate to the throat to change effective size of the throat by fluidic control.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising:
an aircraft and a gas turbine engine coupled to the aircraft, the gas turbine engine including a turbine discharging the working fluid into the nozzle and a compressor providing the pressurized fluid, the aircraft being propelled with the thrust; and
an actuation subsystem operable to selectively actuate reconfiguration of the first wall structure and the second wall structure, and to selectively regulate operation of the one or more control valves.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the engine includes a conduit in fluid communication with a discharge region of the compressor and the one or more control valves.

### Claim 4 (depends on 2)

The apparatus of claim 2, wherein the engine includes a conduit in fluid communication with an interstage region of the compressor and the one or more control valves.

### Claim 5 (depends on 1)

The apparatus of claim 1, which includes an actuator for actuating the first convergent flap and the second convergent flap.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the actuator includes a conduit for routing the pressurized fluid to a first actuator chamber for the first convergent flap and a second actuator chamber for the second convergent flap.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the throat is defined by the first wall structure and the second wall structure as an adjustable convergent-divergent type.