| 摘要 |
A beam jet propellor is provided, especially a beam jet propellor which increases the friction force of the fluid by means of spiral or linear diversion protrusions or diversion grooves on the inner wall of a tube, such that original loose fluid can be twisted together into a beam shape under pressure/rotation/extrusion and form inter-tube pressure. The beam fluid may generate a strong propelling force. Meanwhile, because less air is included in this beam fluid, the bubble friction is smaller and acoustic noise is greatly decreased. The present invention does not adopt a traditional propellor as the propelling device, therefore, the cavitation due to ┌Bernoulli theorem┘ is not generated, and the problem of resistance force and drag force in the fluid is also eliminated. The propelling force is thus greatly increased.
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