Bionic pump jet propeller

Abstract

The invention provides a pump jet propeller. The pump jet propeller is composed of rotors, stators and a conduit. Compared with a conventional propulsion mode, the pump jet propeller has better low noise performance. The invention aims to reduce the noise generated by the pump jet propeller in the operation process and improve the stealth performance of an underwater vehicle. The propeller imitates the sawtooth structures of tail edges of owl wings, the conduit and the stators of the pump jet propeller are re-designed, and the sawtooth structures are formed on the tail edges of the pump jet propeller through cutting. After the structure of the propeller is changed, continuous eddies formed behind the tail edges of the conduit and the stators are cut into several small eddy bodies through sawteeth, the circumferential continuity is weakened, eddy diffusion is accelerated, and vibration and noise caused by the eddies at the work time of the pump jet propeller are reduced. For the underwater vehicle, the vibration strength of the propeller can be reduced, the sound pressure level of radiation noise of the pump jet propeller can be significantly reduced, the stealth performance of theunderwater vehicle is improved, the survival ability of the underwater vehicle is improved at the time of fighting, and the propeller provides a promising noise-reduction technology.

Description

[0001] Technical field [0002] The invention relates to a bionic pump-jet propeller, in particular to bionic design of the duct and stator part of the traditional pump-jet propeller. By cutting a sawtooth structure on the tail edge of the duct and stator, the vibration generated by the propeller is reduced With noise, it improves the concealment and survivability of the underwater vehicle. Background technique [0003] Compared with conventional propellers, pump-jet thrusters have excellent propulsion efficiency, anti-cavitation performance and stealth performance. In general, the number of blades of the propeller rotor is more than that of conventional propellers, mostly 7 to 17 blades. Increasing the number of blades can reduce the vibration and low-frequency noise of the propeller; the propeller duct usually uses a deceleration duct to reduce the exit area It can increase the thrust of the blade and delay the occurrence of cavitation; the propeller stator can be divided into a...

AI Technical Summary

Problems solved by technology

[0005] 1) The rear stator cannot organize the flow field in front of the pump-jet propeller, resulting in higher vortex intensity inside the propeller and in the wake field, which also increases the vortex noise generated by the propeller;

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