Internally ventilated noise suppressor for jet engine
US4474259A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Apr 26, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02K1/46
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A noise suppressor (24, 76) for a jet engine nozzle (12, 64) is constructed so that the noise suppressor internally ventilates the nozzle jet efflux with ambient air by tubes (26, 78) having ambient inlets (30, 90) upstream of the nozzle discharge end (38, 72). The noise suppressor tubes may be relatively short with respect to the nozzle length but extend downstream of the nozzle so that the gas exhaust jet pumps or aspirates ambient air through the internally ventilating tubes so as to properly mix the air with the gas exhaust to suppress the noise from the jet engine exhaust. The internally ventilating ducts of the noise suppressor extend downstream of the nozzle (38, 40, 72, 84) at least to just beyond a region of high static pressure in the jet and extend in the jet to where a substantial ejected airflow pressure and volume are maintained in the ducts. Where the internally ventilating ducts are arranged concentrically about the axis of the discharged jet, noise is suppressed radially around the nozzle. In other embodiments where the ducts are eccentrically positioned, noise is reduced in a favored or selected direction so as to reduce the total ventilation necessary in comparis…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.