Bionic propeller with saw-tooth-shaped following edges

Abstract

The invention provides a bionic propeller with saw-tooth-shaped following edges. The bionic propeller is characterized by comprising a propeller hub and propeller blades evenly arranged on the propeller hub. Saw-tooth-shaped structures having sine-like waves are arranged on the following edges of the propeller blades. Multiple saw teeth are arranged on the following edge of each propeller blade and averagely distributed between 0.4 R-0.85R, wherein R is the radius of the bionic propeller. Compared with a common propeller, under the conditions that the thrust and efficiency of the propeller are not lowered, following edge wake flow eddies of the propeller can be reduced obviously, the turbulence intensity of following edge wake flows is lowered, and then noise generated by the propeller is obviously lowered. In this way, influences on sailors and passengers of ships can be reduced, and concealing performance and safety of military ships can be improved.

Description

technical field [0001] The invention relates to the technical field of ship noise reduction, in particular to a bionic propeller with a zigzag edge, which can improve the comfort of commercial ships or the stealth and safety of military ships through the propeller noise reduction technology. Background technique [0002] In the field of shipbuilding and ocean engineering, propeller vibration and noise prediction and control have always been a research hotspot. The propeller works in the non-uniform flow field at the stern. Due to the unsteady nature of the propeller wake, pulsation is generated, which causes noise. The quality of the flow field directly determines the size of its noise. Although the propeller noise has no effect on its hydrodynamic performance, ship noise is an important problem faced by the crew and passengers. In the field of civil ships, excessive propeller vibration and high noise will affect the living comfort, hearing and hearing of the crew and passen...

AI Technical Summary

Problems solved by technology

Excessive vibration will affect the normal use of some instruments and equipment on the ship and reduce its service life, and its harm to military ships is sometimes fatal

First of all, the noise will provide the enemy's underwater acoustic detection equipment with the position information of the own ship; secondly, the noise may detonate some underwater weapons arranged by the enemy, such as mines equipped with acoustic fuzes, which will pose a threat to their own safety. serious threat

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