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Active vibration grating capable of increasing atmosphere boundary layer wind tunnel turbulence level

An atmospheric boundary layer and vibrating grid technology is applied in the field of active vibrating grids to enhance the wind tunnel turbulence degree of the atmospheric boundary layer, which can solve the problem that the fixed grid can not greatly change the turbulence degree of the flow field, so as to enhance the turbulence intensity. Effect

Inactive Publication Date: 2016-08-31
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3. The fixed grids that are commonly used today cannot greatly change the turbulence of the flow field, so that the simulated wind field has limitations

Method used

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  • Active vibration grating capable of increasing atmosphere boundary layer wind tunnel turbulence level
  • Active vibration grating capable of increasing atmosphere boundary layer wind tunnel turbulence level
  • Active vibration grating capable of increasing atmosphere boundary layer wind tunnel turbulence level

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 , 3 As shown, an active vibrating grid that can enhance the turbulence of the atmospheric boundary layer wind tunnel includes:

[0041] A wind tunnel box, the two opposite sides of the wind tunnel box are hollow, the grille is set in the wind tunnel box, the incoming wind can pass through the grille, and the grille is connected to the motor, and the vibration of the grille is changed by the motor drive Vibration speed of the grille bar in the wind tunnel box is realized.

Embodiment 2

[0043] Such as figure 1 , 3 As shown, an active vibrating grid that can enhance the turbulence of the atmospheric boundary layer wind tunnel includes:

[0044] A wind tunnel box, the two opposite sides of the wind tunnel box are hollow, the grille is set in the wind tunnel box, the incoming wind can pass through the grille, and the grille is connected to the motor, and the vibration of the grille is changed by the motor drive Vibration speed of the grille bar in the wind tunnel box is realized.

[0045] The wind tunnel box is a cuboid or cube, and rails are set on the top and bottom of the wind tunnel box, and the wind tunnel box is connected with a motor, and driven by the motor, it makes reciprocating motion along the rails.

Embodiment 3

[0047] Such as figure 1 , 3 As shown, on the basis of an active vibrating grid that can enhance the turbulence of the atmospheric boundary layer wind tunnel in Example 2, the shape parameters of the grid mainly include the number N of grids, the width B of the grid and the center hole of the grid The side lengths C1, C2, where the grid shape parameters are selected as follows:

[0048]

[0049] as well as

[0050]

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Abstract

Firstly, a vibration grating method is adopted to research a uniform turbulent flow, an active vibration grating capable of increasing an atmosphere boundary layer wind tunnel turbulence level is provided, the grating is arranged in a wind tunnel box, the grating is connected with a motor, the motor drives the vibration grating to change the vibration speed, and the grating is enabled to vibrate controllably in the wind tunnel box. Inflow wind can pass through the grating, the turbulent flow intensity of a test position is enhanced by the wake of grating strips, and precise adjustment of the turbulent flow intensity is realized. The invention aims to obtain a control method of the turbulence level of a uniform turbulent flow field, and wind-induced vibration response tests of structures such as a deck slab under a specific uniform turbulent flow field are accurately carried out; and then a vibration grating, wedge and rough element combined coupling system is adopted to simulate an atmosphere boundary layer in practical engineering, and the accurate analysis of wind vibration responses of building models is realized. According to the invention, the research of structures in the uniform turbulent flow field and the atmosphere boundary layer wind field is realized, and wind vibration response analysis requirements of a plurality of kinds of structures are met.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics experiments, and in particular relates to an active vibrating grid capable of enhancing the turbulence of the wind tunnel of the atmospheric boundary layer and a method for enhancing the turbulence of the wind tunnel of the atmospheric boundary layer. Background technique [0002] At present, the wind tunnel simulation of the atmospheric boundary layer is of great significance to the study of wind loads on buildings, the diffusion of atmospheric pollutants, and some environmental sciences and even military projects. The simulation method has also attracted the attention of scholars. Among the existing simulation methods, they can be roughly divided into two types: active simulation methods and passive simulation methods. The principle of the active simulation method is to use a controllable active disturbance device to interfere with the main airflow in the wind tunnel, and to provide addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 林坤刘红军黄勤柴华魏芬洋
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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