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:
Sep. 04, 2001
Filed:
Oct. 22, 1999
Neil W Harvey, Derby, GB;
Martin G Rose, Derby, GB;
Rolls-Royce plc, London, GB;
Abstract
An axial flow turbomachine has at least one circumferential row of aerofoil members in which at least one of the two end walls (,) between successive blades (,) is given a non-axisymmetric profile to modify the boundary layer flow at the wall. In one form of the profile, a convex region (,) adjacent each member pressure surface (,) and a complementary concave region (,) adjacent each member suction surface (,) extend over at least a major part of the blade chord lengths to reduce the transverse pressure gradient and thereby reduce vortical energy losses. In another form of the profile, at least one end wall (,) has complementary convex and concave regions (,) extending through the zone of the trailing edges of the members (,) on the suction end pressure surface sides (,) respectively of each member, thereby to reduce over turning of the flow. Both forms of profiling can be employed in combination.