| 摘要 |
<p>A turbine comprises a shaft 12 affixed around which is a wide flat helix 15, the inner edge 16 of the helix being contiguous with the outer surface of the shaft. The helix, like a screw thread, has a precise pitch, the distance between its turns being congruous throughout. The space between the turns of the helix is a helical conduit 18 allowing fluid to flow through. The aperture 14 at one endpoint of the helical conduit is blocked whereas the corresponding aperture at the opposite endpoint remains open, allowing fluid to exhaust. The turbine further comprises, extending to the outer periphery of the helix, a stratum 20 having the same height as the pitch 17 of the helix and comprising a series of valvular channels 19 through which fluid is admitted to the turbine, positioned tangentially to the circumference of the helix and precisely shaped to allow unidirectional inward flow. Two intertwined helices (31,32, fig.5) may be used. Longitudinal fins (33, fig.5) may be provided on the external surface of the turbine, eg in a wind turbine. When mounted vertically undersea, the turbine (81, fig.8) pumps water up to the surface for potential energy storage.</p> |
