SPAR FOR A WATER-DRIVEN TURBINE BLADE AND MANUFACTURE THEREOF

摘要

A water-driven turbine blade includes an elongate spar 24 of fibre reinforced resin composite material. The spar comprising a root mounting portion 44 which mounts an end of the spar to a turbine member and an elongate blade supporting portion 48 extending longitudinally away from the root mounting portion 44. The root mounting portion 44 includes a pair of flange portions 50, 52 extending transversely outwardly on respective opposite transverse sides of the spar. The flange portions 50, 52 may be tapered outwardly and may be clamped in place be fitting portions 26. A plurality of blades made with such spars may be clamped by a pair of annular fittings. An additional pair of flanges may be provided to produce a cross-shaped root section (figure 9). The spar may comprise multiple flat reinforcing layers, some with angled fibres to allow a small root radius (figure 4).