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Adjustable wedge roughness element combined system capable of acquiring incoming wind for experiment

A combined system and rough element technology, applied in the field of fluid mechanics, can solve the problems of turbulence integral scale reduction, active simulation control technology complex, expensive, etc., and achieve the effect of improving turbulence intensity

Inactive Publication Date: 2016-08-24
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Active analog control technologies are complicated and expensive, which limits their popularization and application
[0008] 2. The traditional passive simulation method turbulence integration scale decreases with the increase of height, contrary to the actual situation
[0009] 3. The turbulence intensity simulated by the triangular wedge decays too fast with the increase of height

Method used

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  • Adjustable wedge roughness element combined system capable of acquiring incoming wind for experiment
  • Adjustable wedge roughness element combined system capable of acquiring incoming wind for experiment
  • Adjustable wedge roughness element combined system capable of acquiring incoming wind for experiment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 and 2 As shown, an adjustable wedge-rough element combination system to obtain the inflow wind required for the experiment includes a flat plate that can rotate around the central axis. Split, the area or size of the sharp splits placed on the three layers from top to bottom changes from large to small.

[0033] The incoming air volume at each height is adjusted by a plate that can rotate around the central axis to obtain a generally linearly changing wind speed profile (no large energy loss will be caused when such a wind speed profile with a small bottom and a large top is generated), Placing wedges on the slab at each height further adjusts the mean wind profile.

[0034] Wherein, in a preferred option, the shape of the wedge is triangular. The wedges are made of stretchable elastic material and are preferably fixed directly to the ends of the layers of the rotating plate.

Embodiment 2

[0036] Such as figure 1 and 2 As shown in , 3, an adjustable wedge rough element combination system to obtain the inflow wind required for the experiment, including a flat plate that can rotate around the central axis, the flat plate divides the wind tunnel into three layers, wherein each layer is evenly placed with the same shape The wedges, the area or size of the wedges placed on the three layers from top to bottom change from large to small.

[0037] The incoming air volume at each height is adjusted by a plate that can rotate around the central axis to obtain a generally linearly changing wind speed profile (no large energy loss will be caused when such a wind speed profile with a small bottom and a large top is generated), Placing wedges on the slab at each height further adjusts the mean wind profile.

[0038] Among them, in the preferred option, the wedge is trapezoidal. The wedges are made of stretchable elastic material and are preferably fixed directly to the end...

Embodiment 3

[0042] Such as figure 1 and 2 As shown in , 3, an adjustable wedge rough element combination system to obtain the inflow wind required for the experiment, including a flat plate that can rotate around the central axis, the flat plate divides the wind tunnel into three layers, wherein each layer is evenly placed with the same shape The wedges, the area or size of the wedges placed on the three layers from top to bottom change from large to small.

[0043] The incoming air volume at each height is adjusted by a plate that can rotate around the central axis to obtain a generally linearly changing wind speed profile (no large energy loss will be caused when such a wind speed profile with a small bottom and a large top is generated), Placing wedges on the slab at each height further adjusts the mean wind profile.

[0044] Among them, in the preferred option, the wedge is trapezoidal. The wedges are made of stretchable elastic material and are preferably fixed directly to the ends ...

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Abstract

The invention provides an adjustable wedge roughness element combined system capable of acquiring incoming wind for an experiment. The system comprises flat plates which can rotate around a central shaft, wherein a wind tunnel is divided into a plurality of layers through the flat plates; each layer is uniformly provided with wedges with the same shape; the area and size of the wedges which are positioned from top to bottom decrease. The system is characterized in that the whole flow field of the air tunnel is divided into a plurality of partial flow fields through separating plates; a rotating angle of each flat plate at each layer, the quantity of the flat plates, and the size, spacing and shape of the wedge at the tail end of the flat plate at each layer can be adjusted to achieve quantitation control of the partial flow fields; when in the quantitation control of the partial flow fields, the rotating angles of the flat plates, and the shape and the size of the wedges are changed to adjust the average wind profile of a boundary layer, so that the turbulence intensity can be reduced as height increases; meanwhile, the defect that the turbulence intensity is reduced excessively fast as the height increases can be improved, and as a result, the local flow fields intercoordinate to enable the flow field quality to meet the experiment requirement.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics, and in particular relates to an adjustable wedge-rough element combination system for obtaining the incoming wind required by the experiment. Background technique: [0002] In the past three decades, the simulation of the atmospheric boundary layer wind tunnel has become a basic tool for studying wind engineering problems such as the force of the wind on the building structure and the wind environment around the building. Since the quality of the incoming wind simulated by the wind tunnel test directly determines whether the experimental results are correct or not, it is very important to be able to simulate the atmospheric boundary layer that is closest to the real situation. [0003] At present, scholars at home and abroad have done a lot of research on how to simulate high-quality incoming wind. At present, there are mainly two ways of active simulation and passive simulation. Passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 林坤刘红军黄勤许攀徐蕾
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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