BLADE FOR A WATER CURRENT TURBINE ROTOR, WATER CURRENT TURBINE COMPRISING SUCH A BLADE, ASSOCIATED WATER CURRENT TURBINE AND METHOD FOR PRODUCING SUCH A BLADE

摘要

The invention relates to a blade (24) for a water current turbine rotor, which extends along a radial direction (R) and comprises an upper surface (EXT), a lower surface (INT), a leading edge (36), and a trailing edge (38). The leading edge (36) is the edge of the blade (24) that extends substantially along the radial direction (R) and is disposed upstream in the direction in which the water flows along the blade (24), while the trailing edge (38) is the edge of the blade (24) opposite the leading edge (36) and is disposed downstream in the direction of flow. Viewed in cross-section along a cutting plane (P), at least one portion of the blade (24) has a profile (40) comprising a thick portion (42) and a thin portion (44), the cutting plane (P) being perpendicular to the radial direction (R). The thick portion (42) and the thin portion (44) each have a maximum thickness (E1, E2) along a direction perpendicular to the upper surface (EXT), the maximum thickness (E1) of the thick portion (42) being at least four times greater than the maximum thickness (E2) of the thin portion (44). The curvilinear length (L2) of the thin portion (44) is between 0.1 times the length (C) of the chord (46) between the leading edge (36) and the trailing edge (38) and 0.9 times the length (C) of the chord (46), preferably between 0.25 times the length (C) of the chord (46) and 0.9 times the length (C) of said chord (46).