# US 5,347,807 A · Combined jet engine with RAM jet and turbojet

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- Number: US 5,347,807 A
- Document ID: US5347807A
- Status: Granted
- Kind: A
- Application number: 08/075,882
- Filed: 1993-06-14
- Granted: 1994-09-20
- Earliest claimed: 1992-06-24
- Assignees: Societe Nationale d'Etude et de Construction de Moteurs d'Aviaton S.N.E.C.M.A.
- Inventors: Pascal N. Brossier; Georges Mazeaud; Pascal C. Wurniesky
- Web page: https://patentgrep.com/patent/US5347807A

## CPC

- F02K 3/075: controlling flow ratio between flows
- Y10T 137/0536: Highspeed fluid intake means [e.g., jet engine intake]
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A jet engine includes a gas turbine, peripheral ramjet channels located oide the gas turbine and including burners wherein a gas circulation stream in the engine is subdivided over part of its length into a central turbojet stream which flows through the gas turbine, the peripheral ramjet channels and peripheral discharge channels terminating by flowing into a part of the gas circulation stream downstream of the turbine. A plurality of flaps are provided for opening and closing the central stream. A ring surrounds the central stream and extends in front of part of the peripheral discharge channels and ramjet channels. A motor is also provided for rotating the ring wherein the ring has a plurality of slots formed therein, the channels being arranged such that the slots successfully pass, during rotation of the ring in a continuous direction, in front of the discharge channels only, then in front of none of the channels and then in front of the ramjet channels only.

## Claims

### Claim 1

A jet engine, which comprises:
a gas turbine located in the engine;
peripheral ramjet channels located in the engine and outside said gas turbine and including burners wherein peripheral discharge channels are located in the engine and a gas circulation stream flow through the engine which is subdivided over part of the length of the stream into a central turbojet stream which flows through said gas turbine, and wherein said peripheral ramjet channels and said peripheral discharge channels terminate by issuing into a part of the gas circulation stream downstream of the turbine;
a plurality of flaps located in the engine for opening and closing the central stream;
a ring surrounding the central stream and extending in front of part of the peripheral discharge channels and the ramjet channels, and
a motor for rotating the ring wherein the ring has a plurality of slots formed therein, the peripheral discharge channels and ramjet channels being arranged such that the slots of the ring successively pass, during rotation of the ring in a continuous direction, in front of the discharge channels only, then in front of none of the channels and then in front of the ramjet channels only.

### Claim 2 (depends on 1)

A jet engine according to claim 1, which comprises a pinion which is driven by said motor wherein the ring includes a toothed rim which meshes with said pinion.