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Ventilator blade fluid-solid coupling model

A fluid-solid coupling model and fluid-solid coupling technology, applied in computer-aided design, special data processing applications, instruments, etc., can solve problems such as in-depth research, major accidents of ventilators, and economic losses

Active Publication Date: 2019-07-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interaction between the aerodynamic force and the vibration characteristics of the blades often leads to major accidents of the fan, and also brings great economic losses to the production of the enterprise.
[0004] Blade flutter and failure are typical problems of fluid-structure interaction. Since it belongs to marginal science and involves many branches of disciplines, the research on it is not very deep.

Method used

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  • Ventilator blade fluid-solid coupling model
  • Ventilator blade fluid-solid coupling model
  • Ventilator blade fluid-solid coupling model

Examples

Experimental program
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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] Step 1: Establish the governing equation in the solid domain. The basic equation of the fan blade is a vibration equation with two degrees of freedom, which is divided into the vertical motion change α of the blade and the torsional motion change angle β. The simplified equation in its dimensionless form is as follows :

[0034]

[0035]

[0036]

[0037] Where: S β and I β is the dimensionless static moment and torque of the blade, C l is the lift coefficient, C m is the torque coefficient, M ∞ is the incoming flow Mach number, ω α and ω β are the natural frequencies in two directions, μ is the mass ratio, U is the flow velocity, and K S Blade stiffness coefficient matrix, M S is the mass matrix of the blade, β 0 is the static angle of attack of the blade, F S is the force matrix of the blade.

[0038] Step 2: Estab...

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Abstract

The invention discloses a ventilator blade fluid-solid coupling numerical analysis method, which comprises the following steps of respectively establishing the dynamic models and basic equations of afluid domain and a solid domain, the boundary conditions and a turbulence model, and substituting the equations into a fluid-solid coupling model flow chart. The vibration of the solid on the couplingboundary causes the movement of the fluid, and the pressure during the movement of the fluid reacts on the solid to form a coupling effect between the fluid and the solid, thereby establishing a bidirectional coupling model of the blade fluid-solid coupling problem. Compared with an existing blade fluid-solid coupling model, the blade fluid-solid coupling model is closer to reality, the effect offluid is not purely treated into the damping effect, but the fluid domain and the solid domain are regarded as a complete engineering problem.

Description

technical field [0001] The invention relates to a fluid-solid coupling model of a fan blade. Specifically, the invention relates to dynamic analysis and modeling of a fan blade, and belongs to the field of fluid-solid coupling mechanics. Background technique [0002] Fans are widely used in factories, mines, tunnels, cooling towers, ships and buildings because of their stable wind pressure, large air volume, high efficiency and low noise. The blade is the key component of the fan, which bears the comprehensive effects of centrifugal force, fluid power, vibration, temperature difference, medium, etc. [0003] The working medium of the fan is gas, so various fluid-solid coupling phenomena inside the fan have a great influence on the occurrence and development of the fault, which increases the difficulty of accurately diagnosing the fault of the fan blade. Among the various faults of fans, blade failure accounts for a large proportion, and the main fault types are: blade crack...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 付胜苗岩岩
Owner BEIJING UNIV OF TECH
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