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:
Jan. 30, 2001
Filed:
Feb. 25, 1999
Michael W. Su, Seattle, WA (US);
Steve D. Podleski, Seattle, WA (US);
Thomas A. Gally, Seattle, WA (US);
Sean A. Newsum, Seattle, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A turbo fan engine nacelle houses an engine which forces engine exhaust through a primary nozzle and a fan nozzle positioned along a common central axis. The primary nozzle is bordered interiorly by a primary nozzle plug and bordered exteriorly by a primary nozzle sleeve. The fan nozzle is bordered interiorly by a core cowl and bordered exteriorly by a fan nozzle sleeve. The primary nozzle plug includes a generally cone shaped outer surface which is concave when viewed in side elevation. The concave outer surface has a radius of curvature (R,). The core cowl has a distal end which is radially spaced from the outer surface of the primary plug by a distance (&Dgr;H) in a direction perpendicular to the central axis. The primary nozzle plug and core cowl define a ratio R,/&Dgr;H between approximately 14 and 18. The distal end of the core cowl has a core cowl radius R,with respect to the central axis. A discharge end of the fan nozzle sleeve has a fan nozzle sleeve radius R,, wherein a ratio R,/R,is between approximately 0.4 and 0.6. The outer surface of the primary plug forms a primary plug angle &phgr;,between approximately 13° and 19° with respect to the central axis at the primary nozzle exit. The proper scaling of these key dimensions thereby defines a primary nozzle which reduces the shock associated noise of the turbo fan engine.