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Elastic vane propeller flow noise prediction method

A technology of elastic blades and prediction methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as not considering the fluid-structure two-way coupling effect

Inactive Publication Date: 2017-05-31
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] However, in the past research, scholars mainly regarded the propeller as a rigid body or only performed one-way coupling between fluid and structure, that is, first calculated the flow field, and then transferred the pressure result to the structure, without considering the relationship between fluid and structure. two-way coupling

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  • Elastic vane propeller flow noise prediction method
  • Elastic vane propeller flow noise prediction method
  • Elastic vane propeller flow noise prediction method

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Embodiment Construction

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0042] Such as figure 1 -6 shows:

[0043] Step 1 geometric modeling: the software used in this step is Solidworks, according to figure 2 The schematic diagram of the propeller projection principle and the coordinate transformation formula are shown:

[0044]

[0045] Where: φ is the pitch angle; θ is the pitch angle; L is the distance between the maximum thickness line and the reference line; r is the blade cutting surface radius; X 1 , Y 1 ,Z 1 is the coordinate value in the local coordinate system; X, Y, Z is the coordinate value in the global coordinate system.

[0046] The two-dimensional plane coordinates of the DTMB 4119 propeller blade section can...

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Abstract

The invention discloses an elastic vane propeller flow noise prediction method. The method comprises the following steps: building a full-size model for a propeller and a fluid domain to be analyzed, wherein the model comprises a rotating domain which rotates along with the propeller and a static domain which does not rotate; meshing the full-size model and setting a noise sampling point; setting solving parameter of a flow field and a sound field for the meshed full-size model; updating the dynamic mesh for the full-size model; setting the material property for the solid part of the propeller; conducting grid partitioning and coupling surface parameters; setting fluid-solid coupled computing process parameters and fluid-solid coupled control equations; wherein, tau is the stress, n is the normal vector, d is displacement, and the subscripts f and s refer to the fluid and the solid respectively; conducting fluid-solid coupling until the algorithm converges; obtaining flow field data at the monitoring point; calculating the pressure level of the monitoring point according to the FW-H equation; obtaining a power spectral density curve of the sound field according to the fast Fourier transforming FFT function.

Description

technical field [0001] The invention relates to a method for predicting flow noise of propellers with elastic blades, design patent classification number G06 Calculation; Calculation; Counting G06F Electrical digital data processing G06F17 / 00 Especially suitable for digital computing equipment or data processing equipment or data processing methods with specific functions G06F17 / 50 Computer Aided Design. Background technique [0002] Propeller noise is the main part of submarine noise. According to the generation mechanism, it can be divided into blade vibration noise, cavitation noise and flow noise. Among them, blade vibration noise and cavitation noise are the main parts of propeller noise. The vibration noise and cavitation noise of the blade can be solved to a certain extent by optimizing the design of the propeller. Propeller flow noise refers to the noise generated by the interaction between turbulent flow and propeller, resulting in pressure pulsation and vortex sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F30/23Y02T90/00
Inventor 邹丽鲁建华孙铁志宗智姜胜超于游
Owner DALIAN UNIV OF TECH
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