Patent ID: 8579594
Filing Date: 2013-11-12
Classification: B64C,F01D,F03D,F05B,F05D,Y02E,Y02T

Abstract:
1. Wind turbine blade ( 10 ) having a longitudinal direction with a root end ( 16 ) and a tip end ( 14 ) as well as a chord extending in a transverse direction between a leading edge ( 18 ) and a trailing edge ( 20 ), the blade ( 10 ) comprising a flow control surface with a suction side and a pressure side, wherein a number of boundary layer control means ( 40 ) is formed in the flow control surface, wherein the boundary layer control means ( 40 ) include a channel submerged in the flow control surface ( 112 ; 212 ; 312 ; 412 ; 512 ; 612 ) with a first end ( 102 ; 202 ; 302 ; 402 ; 502 ; 602 ) facing towards the leading edge ( 18 ) and a second end ( 104 ; 204 ; 304 ; 404 ; 504 ; 604 ) facing towards the trailing edge ( 20 ) of the blade ( 10 ), the channel comprising: a bottom surface ( a first sidewall ( a second sidewall ( the channel at the first end ( 102 ; 202 ; 302 ; 402 ; 502 ; 602 ) comprises a first flow accelerating channel zone ( 122 ; 222 ; 322 ; 622 ) adapted for accelerating a flow, wherein the first sidewall and the second sidewall of the first flow accelerating channel zone are non-divergent, and the channel at the second end ( 104 ; 204 ; 304 ; 404 ; 504 ; 604 ) comprises a second channel zone ( 124 ; 224 ; 324 ; 624 ), where the first sidewall ( 108 ; 208 ; 308 ; 408 ; 508 ; 608 ) and the second sidewall ( 110 ; 210 ; 310 ; 410 ; 510 ; 610 ) in the second channel zone are diverging towards the trailing edge ( 20 ) of the blade ( 10 ) and wherein a vortex is generated and propagated within the second channel zone.