| 摘要 |
Fluid propulsion mechanism, for example, a marine craft propulsion mechanism, a pump or turbine, comprising a drivable impeller for partial immersion in the fluid. The impeller is substantially free of transverse fluid thrust formations and utilizes the friction between the fluid and the impeller for the transference of kinetic energy therebetween. The impeller has formed in a fluid-contacting surface thereof a groove into which fluid can enter, the depth of the groove being equal to or greater than the width thereof.
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