# US 11,994,064 B2 · Systems and methods for controlling an intake inlet shape of a propulsion system air intake

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- Number: US 11,994,064 B2
- Document ID: US11994064B2
- Status: Granted
- Kind: B2
- Application number: 17/977,722
- Filed: 2022-10-31
- Published: 2024-05-02
- Granted: 2024-05-28
- Earliest claimed: 2022-10-31
- Assignees: Pratt & Whitney Canada Corp.
- Applicants: Pratt & Whitney Canada Corp.
- Inventors: Mark Cunningham; Eray Akcayoz; Raja Ramamurthy; Roberto Marrano
- Web page: https://patentgrep.com/patent/US11994064B2

## CPC

- B64D 33/02: of combustion air intakes
- F02C 7/042: having variable geometry
- B64D 2033/0226: {comprising boundary layer control means}
- B64D 2033/0293: {for turboprop engines}
- F05D 2220/323: for aircraft propulsion, e.g. jet engines
- F05D 2270/60: Control system actuates means
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An air intake for an aircraft propulsion system includes an air inlet duct and a flow control device. The air inlet duct includes an interior surface and an intake inlet. The interior surface extends from the intake inlet. The interior surface forms and surrounds an inlet flow passage through the air inlet duct. The intake inlet includes a top side, a bottom side, a first lateral side, and a second lateral side. Each of the first lateral side and the second lateral side extend between and to the top side and the bottom side. The flow control device is disposed inside the air inlet duct at the first lateral side. The flow control device is configured to form an asymmetrical shape of the intake inlet at the first lateral side relative to the second lateral side.

## Claims

### Claim 1

A propulsion system for an aircraft, the propulsion system comprising:
a gas turbine engine including a propeller, the propeller configured for rotation about a rotational axis of the propulsion system, the gas turbine engine forming a core flow path;
an air intake configured to direct air into the core flow path, the air intake including an air inlet duct and a flow control device, the air inlet duct including an intake inlet disposed downstream of the propeller, the intake inlet including a top side, a bottom side, a first lateral side, and a second lateral side, each of the first lateral side and the second lateral side extending between and to the top side and the bottom side, the flow control device disposed inside the air inlet duct at the first lateral side, the flow control device configured to form an asymmetrical shape of the intake inlet at the first lateral side relative to the second lateral side, and the flow control device includes:
an inflatable boot and a fluid regulator, the inflatable boot disposed at the first lateral side, the fluid regulator in fluid communication with the inflatable boot, the fluid regulator configured to selectively position the inflatable boot in a fully inflated position, a fully deflated position, and a plurality of intermediate inflation positions between the fully inflated position and the fully deflated position to control a shape of the intake inlet; and
an engine control system, the engine control system in signal communication with the fluid regulator, the engine control system including a processor in communication with a non-transitory memory storing instructions, which instructions when executed by the processor, cause the processor to:
determine an air flow condition for the air intake based on a rotation speed of the propeller and a rotation direction of the propeller; and
control the fluid regulator to selectively position the inflatable boot to control the shape of the intake inlet based on the determined air flow condition.

### Claim 2 (depends on 1)

The propulsion system of claim 1, wherein the gas turbine engine includes a compressor forming the core flow path, the fluid regulator in fluid communication with the compressor, the fluid regulator configured to receive a pressurized fluid from the compressor and direct the pressurized fluid to the inflatable boot.

### Claim 3 (depends on 1)

The propulsion system of claim 1, wherein the intake inlet is radially offset from the rotational axis in a radial direction.

### Claim 4

A propulsion system for an aircraft, the propulsion system comprising:
a gas turbine engine including a propeller, the propeller configured for rotation about a rotational axis of the propulsion system, the gas turbine engine forming a core flow path;
an air intake configured to direct air into the core flow path, the air intake including an air inlet duct and a flow control device, the air inlet duct including an intake inlet disposed downstream of the propeller, the intake inlet including a top side, a bottom side, a first lateral side, and a second lateral side, each of the first lateral side and the second lateral side extending between and to the top side and the bottom side, the flow control device disposed inside the air inlet duct at the first lateral side, the flow control device configured to form an asymmetrical shape of the intake inlet at the first lateral side relative to the second lateral side; and
an engine control system, the engine control system in signal communication with the flow control device, the engine control system including a processor in communication with a non-transitory memory storing instructions, which instructions when executed by the processor, cause the processor to:
determine an air flow condition for the air intake based on a rotation speed of the propeller and a rotation direction of the propeller; and
control the flow control device to control the shape of the intake inlet based on the determined air flow condition.

### Claim 5 (depends on 4)

The propulsion system of claim 4, wherein the intake inlet is radially offset from the rotational axis in a radial direction.

### Claim 6 (depends on 4)

The propulsion system of claim 4, wherein the flow control device includes a first device body mounted to the interior surface at the first lateral side, the first device body having a deformable shape.

### Claim 7 (depends on 6)

The propulsion system of claim 6, wherein the first device body includes a leading edge, a trailing edge, and an air flow surface, the leading edge disposed at the second lateral side, the trailing edge disposed downstream of the leading edge, the air flow surface extending from the leading edge to the trailing edge.