| 摘要 |
<p>Fluid thruster apparatus comprises a rotary impeller (17) mounted within a first fluid flow control element (21), the impeller having blades which draw fluid radially into the swept volume of the blades and eject fluid radially, in which the fluid flow control element is configured to constrain radially-ejected fluid in a thurst-inducing direction and the impeller and control element being selectively axially movable relative to each other between a position in which they are in at least partial registration and a position in which they are out of registration. For use as a reversible thruster, for example as a marine power unit or a pump, the apparatus includes a further or second fluid flow control element arranged in opposed fashion to the first fluid flow control element, the impeller being selectively axially movable relative to the control elements between positions in registration with one or other of said flow control elements, whereby axial thrust forces may be generated in respective opposed directions.</p> |
