# US 8,784,047 B2 · Gas turbine engine heat exchanger with tapered fins

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- Number: US 8,784,047 B2
- Document ID: US8784047B2
- Status: Granted
- Kind: B2
- Application number: 12/939,243
- Filed: 2010-11-04
- Published: 2012-05-10
- Granted: 2014-07-22
- Earliest claimed: 2010-11-04
- Assignees: Hamilton Sundstrand Corporation
- Applicants: James S. Elder
- Inventors: James S. Elder
- Web page: https://patentgrep.com/patent/US8784047B2

## CPC

- F04D 29/584: {cooling or heating the machine (F04D29/5846, F04D29/5853 take precedence)}
- F02C 7/14: of fluids in the plant {, e.g. lubricant or fuel (F02C7/185 takes precedence)}
- F02K 3/115: by means of indirect heat exchange
- F05D 2260/98: Lubrication
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- 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)
- 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)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A heat exchanger for a gas turbine engine includes first and second opposing sides enclosing a cavity. A first set of fins is supported on the first side and arranged outside the cavity. The fins have leading and trailing edges respectively including first and second heights. The first height is less than the second height. In one application, the heat exchanger is arranged in a gas turbine engine. A core is supported relative to a fan case. The core includes a core nacelle and a fan case. A fan duct is provided between the core nacelle and the fan case. A heat exchanger includes fins arranged in a fan duct. The fins are oriented such that the shorter leading edge faces into the airflow.

## Claims

### Claim 1

A gas turbine engine comprising:
a core supported relative to a fan case, the core including a core nacelle, and a fan duct provided between the core nacelle and the fan case, wherein the core includes a compressor section and a bleed cavity is provided within the core and configured to be shielded from a fan airflow and in fluid communication with the compressor section; and
a heat exchanger having a plate extending a length and supporting fins that are arranged in the fan duct, the fins extending substantially the length in a longitudinal direction from a leading edge of the fin to a trailing edges of the fin, the leading and trailing edges respectively including first and second heights, the leading edge arranged upstream from the trailing edge, the first height less than the second height, the heat exchanger including first and second sides opposite one another, the first side including the fins configured to be exposed to the fan airflow flow, and the second side including another set of fins exposed to the bleed cavity and configured to be shielded from the fan airflow.

### Claim 2 (depends on 1)

The gas turbine engine according to claim 1, further comprising flow exit guide vanes, wherein the heat exchanger is arranged downstream from the flow exit guide vanes.

### Claim 3 (depends on 1)

The gas turbine engine according to claim 1, comprising an oil cooling circuit including the heat exchanger and a heat load, the heat exchanger including an oil cavity between the first and second sides.

### Claim 4 (depends on 3)

The gas turbine engine according to claim 3, wherein the oil cavity has internal fins oriented in an axial direction that is the same direction in which the fins extend.

### Claim 5 (depends on 1)

The gas turbine engine according to claim 1, wherein the fins include an outer edge adjoining the leading and trailing edges, and the fins include a generally trapezoidal shape provided by the leading and trailing edges and the outer edge.

### Claim 6 (depends on 1)

The gas turbine engine according to claim 1, wherein the leading and trailing edges each include a length, the length of the leading edge shorter than the length of the trailing edge.

### Claim 7 (depends on 1)

The gas turbine engine according to claim 1, the first and second heights perpendicular to the first side and different than the lengths.