Spar for a blade, and a blade

Abstract

A method of fabricating a spar for a blade, which spar includes transversely at least one arrangement. A male former is defined for each arrangement that is to be fabricated and each arrangement is subdivided into a pressure-side subassembly and a suction-side subassembly, each comprising a plurality of hanks, each hank comprising a plurality of U-shaped tape segments stacked on one another. Each subassembly of an arrangement is fabricated outside a mold for fabricating the blade on a single former adapted to that particular arrangement, fabrication being by stacking tape segments on the former using a fiber placement method implemented by a placement head.

What is claimed is: 
     
         1 . A blade having at least one fastener bushing and a spar, the spar including an arrangement wound around the fastener bushing, the arrangement comprising a pressure-side subassembly and a suction-side subassembly, the arrangement extending spanwise and comprising in succession a root zone in the region of the fastener bushing, a connection zone, and then a running zone, wherein at least one section referred to as “connection” section of the arrangement in the connection zone is lozenge-shaped, the pressure-side subassembly being V-shaped and the suction-side subassembly having an upside-down V-shape in the connection section. 
     
     
         2 . The blade according to  claim 1 , wherein each section referred to as “root” section of the arrangement in the root zone comprises at least one rectangular slab extending in elevation along its length, the root axis being a vertical axis substantially orthogonal to the plane in which the spar extends spanwise. 
     
     
         3 . The blade according to  claim 1 , wherein at least one section of a leading-edge arrangement presents a C-shape in the running zone, with a trailing-edge arrangement extending the C-shape in a suction side and in a pressure side of the blade. 
     
     
         4 . The blade according to  claim 1 , wherein the root zone is provided with a C-shaped root wall forming an end wall;
 the connection zone having two twisted connection walls connected respectively to two ends of the end wall; and   the running zone having two running walls connected respectively to the two connection walls.   
     
     
         5 . The blade according to  claim 4 , wherein the arrangement comprises a plurality of U-shaped tape segments stacked on one another. 
     
     
         6 . The blade according to  claim 5 , wherein the tape segments are disposed around a root axis. 
     
     
         7 . The blade according to  claim 6 , wherein the arrangement includes a void forming an inside volume of the spar. 
     
     
         8 . The blade according to  claim 6 , wherein the arrangement includes a fastener bushing, a root wedge surrounding the fastener bushing, and a filler material. 
     
     
         9 . The blade according to  claim 5 , wherein at least one of tape segments covers, in the running zone, another of the tape segments over a chord width that decreases. 
     
     
         10 . The blade according to  claim 5 , wherein at least one of the tape segments extends spanwise from the root axis over a first length, and at least one other of the tape segment extends spanwise from the root axis over a second length that is different from the first length so as to impart decreasing thickness to the arrangement. 
     
     
         11 . A blade having at least one fastener bushing and a spar including an arrangement disposed about the fastener bushing, the arrangement comprising a pressure-side subassembly and a suction-side subassembly, the arrangement extending spanwise and comprising in succession a root zone in the region of the fastener bushing, a connection zone, and then a running zone, wherein at least one section referred to as “connection” section of the arrangement in the connection zone is lozenge-shaped, with the pressure-side subassembly being substantially V-shaped and the suction-side subassembly having a substantially upside-down V-shape in the connection section. 
     
     
         12 . The blade according to  claim 11 , wherein each section referred to as “root” section of the arrangement in the root zone comprises at least one substantially rectangular slab extending in elevation along its length, the root axis being a vertical axis substantially orthogonal to the plane in which the spar extends spanwise. 
     
     
         13 . The blade according to  claim 11 , wherein at least one section of a leading-edge arrangement presents a substantially C-shape in the running zone, with a trailing-edge arrangement extending the C-shape in a suction side and in a pressure side of the blade. 
     
     
         14 . The blade according to  claim 11 , wherein the root zone includes a substantially C-shaped root wall forming an end wall;
 the connection zone having two twisted connection walls connected respectively to two ends of the end wall; and   the running zone having two running walls connected respectively to the two connection walls.   
     
     
         15 . The blade according to  claim 14 , wherein the arrangement comprises a plurality of tape segments stacked on one another. 
     
     
         16 . The blade according to  claim 15 , wherein the tape segments are substantially U-shaped and are disposed about a root axis. 
     
     
         17 . The blade according to  claim 16 , wherein the arrangement includes a void forming an inside volume of the spar. 
     
     
         18 . The blade according to  claim 16 , wherein the arrangement includes a fastener bushing, a root wedge surrounding the fastener bushing, and a filler material. 
     
     
         19 . The blade according to  claim 15 , wherein at least one of tape segments covers, in the running zone, another of the tape segments over a chord width that decreases. 
     
     
         20 . The blade according to  claim 15 , wherein at least one of the tape segments extends spanwise from the root axis over a first length, and at least one other of the tape segment extends spanwise from the root axis over a second length that is different from the first length so as to impart decreasing thickness to the arrangement.