The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2004
Filed:
Jul. 24, 2002
Rolls-Royce plc, London, GB;
Abstract
A fan outlet guide vane assembly ( ) for a turbofan gas turbine engine ( ) comprises a fan casing ( ) and a plurality of circumferentially spaced radially extending fan outlet guide vanes ( ). The fan outlet guide vanes ( ) are secured at their radially outer ends to the fan casing ( ). A plurality of panels ( ) are secured to the fan casing ( ). Each panel ( ) is arranged between two adjacent fan outlet guide vanes ( ) to define the flow path between the fan outlet guide vanes ( ). Each panel ( ) comprises a perforated skin ( ) and a honeycomb structure ( ) to form an acoustic treatment structure. The perforated skin ( ) defines the flow path between the fan outlet guide vanes ( ). The pressure equalization across the panels ( ) minimises the possibility of the panels ( ) being removed.