Turbomachine rotor wheel having composite material blades

A turbomachine rotor wheel (1, 1′, 1″) having composite material blades, characterized in that it comprises:

• a slideway disk (10, 10′) having at its outer periphery a circumferential groove (12) presenting an opening (14, 14′) that is narrower than its bottom (16, 16′;
• a plurality of blades (100, 100′) of composite material, each blade having a blade root (102, 102′) engaged in the groove of the slideway disk and presenting a longitudinal section that is adapted to the longitudinal section of the groove of the slideway disk so as to be held radially therein by co-operating shapes, and a platform for defining a portion of the inner wall of the flow passage for the gas stream passing through the rotor wheel;
• and
• an orientation disk (200, 200′) having at its outer periphery a substantially longitudinal portion (206) with a plurality of axial slots (208), each open at one end and each presenting a cross-section matching the cross-section of a blade root so as to hold the root angularly by co-operating shapes, the orientation disk being mounted on the slideway disk so that its longitudinal portion is received radially between the blade platforms and the opening of the groove of the slideway disk.