Numerical forecasting method for cavitation noise of composite propeller

Abstract

The invention provides a numerical forecasting method for cavitation noise of a composite propeller, and the method comprises the following steps: building a geometric model of the propeller through three-dimensional configuration software according to the design size of the propeller; completing the construction of a hydrodynamic model; establishing a finite element model of the composite propeller by utilizing finite element software; carrying out cavitation performance simulation calculation on the composite material propeller to obtain a cavitation numerical simulation result, and obtaining the difference between the hydrodynamic performance and the cavitation performance of the composite material propeller and the metal material propeller; storing a cavitation numerical simulation result obtained in the fluid analysis software; constructing an acoustic calculation model of the composite propeller, and setting a plurality of monitoring points in the acoustic calculation model; and comparing and analyzing attenuation change rules of the cavitation radiation noise at different positions. According to the method, the vibration noise radiation condition of the propeller can be well predicted, and reference is provided for low-noise propeller design.

Description

technical field

[0001] The invention relates to a numerical prediction method of composite material propeller cavitation noise, and belongs to the technical field of composite material propeller noise. Background technique

[0002] As the development of ships tends to be larger and faster, the load on the propeller blades continues to increase, and cavitation is becoming more and more inevitable. When cavitation occurs on the surface of the propeller, the pressure on the surface of the blade is about the steam pressure in the region where the cavitation occurs, which will inevitably destroy the original hydrodynamic rules of the blade in full wet flow, affect the hydrodynamic performance of the propeller, and reduce the The propulsion efficiency of the propeller; at the same time, when the cavitation collapses, the blade and the two-phase flow have a strong interaction in the cavitation area, which will cause serious erosion of the surface material of the blade; more importa...

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