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:
Mar. 30, 1993
Filed:
Jul. 01, 1991
Applicant:
Inventors:
Bernard Magliozzi, West Suffield, CT (US);
Donald B Hanson, Broad Brook, CT (US);
Assignee:
United Technologies Corporation, Hartford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01B / ;
U.S. Cl.
CPC ...
415167 ; 415119 ; 415183 ; 415185 ;
Abstract
Noise is reduced on an aircraft engine of the type having aft mounted propeller blades 10 which pass through exhaust gas streams 20 expelled from circumferentially spaced nozzles 14. The nozzles 14 are rotated, or the exhaust flow deflected, such that the high velocity exhaust streams 20a expelled from the nozzles 14 are directed away from their normal axial direction to impact the blades 10 at the same relative angle of attack 36a as the relative angle of attack 34 of the low velocity ambient air stream 22 thereby reducing fluctuations in blade lift and the associated noise.