Turbine of thermostructural composite material, in particular a turbine of large diameter, and a method of manufacturing it

A method of manufacturing a turbine comprising a plurality of blades disposed around a hub and between two end plates, the blades, the hub, and the end plates being made of thermostructural composite material, wherein the method comprises the steps of:

• a) making the hub by stacking plane annular plates of thermostructural composite material along a common axis, and fastening the plates so that they are constrained to rotate together about the axis;
• b) making each blade by implementing the following steps:
• shaping an essentially two-dimensional fiber fabric in plate or sheet form to obtain a blade preform;
• densifying the preform with a matrix to obtain a blade blank made of thermostructural composite material;
• and
• machining the outline of the densified preform;
• c) making each end plate by implementing the following steps:
• making an annular or substantially annular preform by means of an essentially two-dimensional fiber fabric in plate or sheet form;
• and
• densifying the preform with a matrix to obtain a part made of thermostructural composite material;
• and
• d) assembling the blades to the hub between the end plates, each blade being connected to the hub by an inside edge portion inserted in a groove formed in the hub.