# US 4,391,566 A · Diffuser and exhaust gas collector arrangement

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- Number: US 4,391,566 A
- Document ID: US4391566A
- Status: Granted
- Kind: A
- Application number: 06/203,381
- Filed: 1980-11-03
- Granted: 1983-07-05
- Earliest claimed: 1979-11-14
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Tousaku Takamura
- Web page: https://patentgrep.com/patent/US4391566A

## CPC

- F01D 25/30: Exhaust heads, chambers, or the like
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10S 415/914: Device to control boundary layer
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

In a gas turbine engine having a diffuser provided downstream of the power section and composed of inner and outer diffuser wall members forming therebetween a diffuser chamber which is open into an exhaust gas collector chamber, the outer diffuser wall member is provided with at least one flow guide member which extends on the generally frustoconical outer peripheral surface of the outer diffuser wall member and which is curved arcuately or circularly about the common center axis of the inner and outer diffuser wall members for thereby suppressing formation of vortices in the flow of the combustion gases being exhausted through the collector chamber.

## Claims

### Claim 1

A gas turbine engine comprising a diffuser composed of inner and outer wall members having a common center axis and radially spaced apart from each other for forming therebetween a diffuser chamber having an annular cross section and axially opposite gas inlet and outlet ends, the outer wall member having a generally frusto-conical peripheral surface axially enlarging in diameter from the gas inlet toward the gas outlet end of the diffuser chamber, a stationary casing structure housing therein said diffuser to form an exhaust gas collector chamber surrounding said outer wall member and having a gas discharge end directed substantially perpendicularly to said common center axis, and a pair of ribs extending arcuately on the outer peripheral surface of said outer wall member and curved about said center aixs, wherein each of said ribs has an outer peripheral end extending with a radius of curvature which is gradually reduced toward said gas discharge end of said exhaust collector chamber.

### Claim 2 (depends on 1)

A gas turbine engine as set forth in claim 1, wherein each of said ribs extends on a plane inclined at an angle within the ranges of between about 90 degrees and about 55 degrees and has an outer peripheral end extending with a radius of curvature which is gradually reduced toward said gas discharge end of said exhaust gas collector chamber.