Title:
LOW-NOISE FAN EXIT GUIDE VANES
Document Type and Number:
WIPO Patent Application WO2005057001
Kind Code:
A3
Abstract:
Low-noise fan exit guide vanes are disclosed. According to the present invention a fan exit guide vane has an outer shell substantially shaped as an airfoil and defining an interior cavity. A porous portion of the outer shell allows communication between the fluctuations in the air passing over the guide vane and the interior cavity. At least one acoustically resonant chamber is located within the interior cavity. The resonant chamber is in communication with the porous portion of the outer perimeter. The resonant chamber is configured to reduce the noise generated at a predetermined frequency. In various preferred embodiments, there is a plurality of acoustically resonant chambers located within the interior cavity. The resonant chambers can be separated by one or more partitions within the interior cavity. In these embodiments, the resonant chambers can be configured to reduce the noise generated over a range of predetermined frequencies.
Inventors:
JONES MICHAEL G (US)
PARROTT TONY L (US)
HEIDELBERG LAURENCE J (US)
ENVIA EDMANE (US)
PARROTT TONY L (US)
HEIDELBERG LAURENCE J (US)
ENVIA EDMANE (US)
Application Number:
PCT/US2004/040842
Publication Date:
April 06, 2006
Filing Date:
December 07, 2004
Export Citation:
Assignee:
NASA (US)
JONES MICHAEL G (US)
PARROTT TONY L (US)
HEIDELBERG LAURENCE J (US)
ENVIA EDMANE (US)
JONES MICHAEL G (US)
PARROTT TONY L (US)
HEIDELBERG LAURENCE J (US)
ENVIA EDMANE (US)
International Classes:
F01D5/16; F02K3/06; F02K; (IPC1-7): F02K
Foreign References:
| US4820117A | 1989-04-11 | |||
| US2783008A | 1957-02-26 | |||
| US6224341B1 | 2001-05-01 | |||
| US3346174A | 1967-10-10 | |||
| US5498137A | 1996-03-12 | |||
| US3853428A | 1974-12-10 | |||
| US3602333A | 1971-08-31 |
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