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:
Apr. 14, 2015
Filed:
Jan. 25, 2012
Applicants:
Shahrokh Shahpar, Derby, GB;
Ning Qin, Sheffield, GB;
Yibin Wang, Sheffield, GB;
Greg Carnie, Aberdeenshire, GB;
Inventors:
Shahrokh Shahpar, Derby, GB;
Ning Qin, Sheffield, GB;
Yibin Wang, Sheffield, GB;
Greg Carnie, Aberdeenshire, GB;
Assignee:
ROLLS-ROYCE plc, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D 1/04 (2006.01); F04D 27/02 (2006.01); F01D 11/08 (2006.01); F01D 25/24 (2006.01); F04D 29/16 (2006.01); F04D 29/68 (2006.01);
U.S. Cl.
CPC ...
F04D 27/02 (2013.01); F01D 11/08 (2013.01); F01D 25/24 (2013.01); F04D 29/164 (2013.01); F04D 29/681 (2013.01); F05D 2250/184 (2013.01);
Abstract
A casing treatment for a fan or compressor stageof a gas turbine engine comprises circumferential groovesA,B,C,D andE which extend in a series disposed between the leading edgesand trailing edgesof bladesof a fan or compressor stage. The groovesvary in depth d in order to optimise the stall margin of the fan or compressor stagewhile preserving peak efficiency.