Noise reduction in jet engines having fans or low pressure compressors
Abstract
Abstract A TURBOFAN JET ENGINE EMPLOYED IN THE PROPULSION OF AIRCRAFT. THE AIR INLET TO A TYPICAL FAN-JET ENGINE IS DEFINED BY THE COWL AND COWL LIP RING WHICH DIRECTS THE INCOMING AIR TO AND THROUGH THE FAN, OR LOW PRESSURE COMPRESSOR, HAVING ROTOR AND STATOR BLADES. THE PRIMARY FLOW IS DIRECTED INTO THE COMBUSTION CHAMBER WHERE HOT GASES RESLUTING FROM COMBUSTION ARE USED TO DRIVE THE FAN OR LOW PRESSURE COMPRESSOR. THE SECONDARY OUTER PORTION OF THE AIR PRESSURIZED BY THE FAN IS DIRECTED REARWARD AROUND THE OUTER EDGE OF THE INNER ENGINE DEFINED BY THE INNER COWL AND THE OUTER WALL ADJACENT THE COMBUSTION CHAMBER AND DIRECTED TO PROVIDE A PROPULSIVE FORCE FROM THE ENGINE. AT LEAST TWO ANNULAR SPLITTER RINGS CONCENTRICALLY SPACED ARE PROVIDED WITHIN THE COWL FORWARD OF THE FAN OR LOW PRESSURE COMPRESSOR.
Inventors
- 👤 George E Medawar
- 👤 Felix Hom
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |