Fluid turbine device

A rotor device for converting the energy of a flowing fluid into mechanical energy which comprises:

• a rotor having ends and a cylindrical side wall;
• a rotor disc at each end of the rotor to rotate with the rotor;
• a housing encasing the rotor, the housing having interior end walls confronting the rotor ends and interior side walls, with fluid inlet and fluid outlet ports in the side walls, a first portion of the interior side wall of the housing being cylindrical and curved with constant radius over an angle of approximately 180°, this portion being spaced a constant distance from corresponding portions of the wall of the rotor, a second portion of the interior side wall of the housing continuing from the extremities of the first portion of the interior side wall and being of curvature of greater radius, the wall of the rotor meeting the interior wall of the housing at a point between inlet and outlet ports about midway on the second portion, the inlet and outlet ports being located in this second portion of the interior side wall of the housing;
• two or more vanes extending from end to end in the rotor and having inner and outer ends extending parallel to the axis of the rotor, each vane movable radially inwardly and outwards between retracted and extended positions with respect to the cylindrical side wall of the rotor within slots therein, the vanes having side shoulders which slide in corresponding guide slots in the rotor discs, with outer ends positioned adjacent the inner wall of the housing, the vanes being spaced from adjacent vanes about the rotor such that there is always at least one vane positioned between inlet and outlet ports;
• means to move each of vanes radially within its associated slots between an extended position and fully withdrawn position so that the outer extremity of each vane is positioned adjacent a corresponding portion of the inner wall of the housing, the rotor, the housing and the vanes constructed so that, during operation of the device, fluid entering housing drives the rotor, the fluid being carried by the rotor in compartments formed between adjacent vanes and, opposing walls of the housing and rotor, and the rotor itself, until the adjacent vanes encompass the outlet port whereby the fluid is allowed to escape.