Coating pump jet propeller capable of inhibiting tip gap vortex cavitation and coating process thereof

Abstract

The invention relates to the technical field of underwater propellers, in particular to a coating pump jet propeller capable of inhibiting tip gap vortex cavitation and a coating process thereof. The coating pump jet propeller comprises a guide pipe, a plurality of stator blades are fixedly arranged on the surface of an inner cavity of the guide pipe, and the plurality of stator blades are evenly distributed in the circumferential direction of the inner cavity of the guide pipe. A rotating shaft is arranged at the center position in the guide pipe, and a plurality of rotor blades are fixedly arranged on the surface of the rotating shaft and evenly distributed in the circumferential direction of the rotating shaft. The outer surface of the rotor blade is completely covered with a flexible film layer. A layer of flexible film is plated on the surface of the pump-jet propeller rotor, a buffer layer is additionally arranged between fluid and the blade, the flow separation length of the blade tip of the pump-jet propeller rotor is increased, the structural strength of a separation vortex of the blade tip of the pump-jet propeller rotor is weakened under the condition that the circulation is not changed, the pressure of the low-pressure area of the tip gap vortex core of the pump-jet propeller is increased, so that the tip gap vortex cavitation starting of the pump-jet propeller is inhibited.

Description

technical field [0001] The invention relates to the technical field of underwater propellers, in particular to a coating pump-jet propeller capable of suppressing tip gap vortex cavitation and a coating process thereof. Background technique [0002] Compared with traditional propeller propellers, pump-jet propellers have the advantages of high critical speed, low radiation noise, and high propulsion efficiency, and are widely used in various types of underwater vehicles, especially those that sail at high speed. However, there are still some technical problems in the practical application of the pump-jet propeller, among which the most notable ones are tip vortex cavitation, and the cavitation noise and vibration caused by it. Research shows that tip vortex cavitation is a form of cavitation that is difficult to eliminate in the design stage, and is a form of cavitation that will eventually appear as the propeller speed increases. Therefore, it is particularly important to ...

AI Technical Summary

Problems solved by technology

With the initiation and further development of tip vortex cavitation, cavitation noise is generated, resulting in a significant increase in the noise of the pump-jet propeller

In addition, the tip vortex and tip vortex cavitation bubbles with strong unsteady motion develop downstream near the rotor blades, causing a significant change in the inflow of the downstream rotor and significantly reducing the propulsion efficiency of the pump-jet propeller; the above-mentioned vortex system directly hits the downstream rotor On the blade, the unsteady flow-induced vibration of the rotor blade is caused, resulting in structural vibration noise

The reduction of propulsion efficiency, cavitation noise and structural vibration noise caused by tip vortex cavitation will significantly increase the overall radiation noise level of underwater vehicles and increase the exposure risk of underwater vehicles

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