Free-standing turbine blade

Abstract

There is described a blade for a turbomachine, such as a steam turbine. The blade has a blade tip, which is curved in relation to the blade airfoil profile. The curvature has the shape of a winglet, which is known from aircraft construction.

1 .- 11 . (canceled) 
   
   
       12 . A blade for a turbomachine, comprising:
 a blade cross-sectional profile with a pressure side and a suction side; and   a blade tip with a curvature.   
   
   
       13 . The blade as claimed in  claim 12 , wherein the curvature is formed as a bend. 
   
   
       14 . The blade as claimed in  claim 12 , wherein the blade has a length, and the curvature of the blade tip extends over 5% of the length. 
   
   
       15 . The blade as claimed in  claim 12 , wherein the blade tip is curved towards the pressure side. 
   
   
       16 . The blade as claimed in  claim 12 , wherein the blade tip is curved towards the suction side. 
   
   
       17 . The blade as claimed in  claim 15 , wherein the blade tip is curved towards the suction side. 
   
   
       18 . The blade as claimed in  claim 12 , wherein the blade tip, is first curved towards the suction side and then curved towards the pressure side in a radial direction towards the blade tip. 
   
   
       19 . The blade as claimed in  claim 12 , wherein a edge of the blade tip is formed basically parallel to a circumferential direction which is formed during operation of the turbomachine. 
   
   
       20 . The blade as claimed in  claim 12 , wherein the blade has differently formed blade cross-sectional profiles along a radial direction of the blade, and wherein a projection of the blade tip in the radial direction is greater than a projection of the largest blade cross-sectional profile, as seen in the radial direction. 
   
   
       21 . The blade as claimed in  claim 12 , wherein the blade has differently formed blade cross-sectional profiles along a radial direction, and wherein a projection of the blade tip in the radial direction is less than the projection of the largest blade cross-sectional profile, as seen in the radial direction. 
   
   
       22 . The blade as claimed in  claim 12 , wherein a blade tip surface opposite to a casing inner wall of the turbomachine has a wear-resistant coating. 
   
   
       23 . The blade as claimed in  claim 12 , wherein the blade consists of steel or consists of titanium. 
   
   
       24 . The blade as claimed in  claim 12 , wherein a blade cross-sectional profile of the blade tip reduces, as seen in the radial direction. 
   
   
       25 . A blade for a turbomachine, comprising:
 a winglet.   
   
   
       26 . The blade as claimed in  claim 25 , wherein the blade has a length, and the winglet of the blade extends over essentially 5% of the length. 
   
   
       27 . The blade as claimed in  claim 25 , wherein the winglet is curved towards a pressure side of the blade, and wherein the winglet is curved towards a suction side of the blade. 
   
   
       28 . A low-pressure steam turbine, comprising:
 a blade with a winglet.   
   
   
       29 . The low-pressure steam turbine as claimed in  claim 28 , wherein the blade has a length, and the winglet of the blade extends over essentially 5% of the length. 
   
   
       30 . The low-pressure steam turbine as claimed in  claim 28 , wherein the winglet is curved towards a pressure side of the blade, and wherein the winglet is curved towards a suction side of the blade. 
   
   
       31 . The low-pressure steam turbine as claimed in  claim 28 , wherein the winglet is at least partly essentially parallel to a casing inner wall of the low-pressure steam turbine and wherein the winglet has a coating.