Turbofan duct with noise suppression and boundary layer control
US4749150A · kind A · utility
73Cited by
14References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1985 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Dec 24, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A boundary layer control device is installed in the acoustically treated inlet duct of a turbofan engine. The device sucks off the turbulent boundary layer of air flowing over the inner or "air wetted" surface of the inlet during aircraft take-off, cruise and approach. The lip of the inlet can thus be made thinner to reduce drag during cruise without degradation of fan performance during take-off. The acoustic liner of the inlet comprises a microporous honeycomb sandwich structure through which air may be sucked at various locations through headers and conduits connected to an onboard pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.