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A convenient and small near-surface atmospheric boundary layer wind tunnel and its application in population risk exposure assessment

An atmospheric boundary layer, near-ground technology, used in aerodynamic testing, testing of machine/structural components, instruments, etc., to achieve high resolution, high accuracy, and saving building space

Active Publication Date: 2021-03-30
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wind tunnel can solve the problem of assessing the migration and transformation process of atmospheric pollutants near the surface layer in the environment and their impact on human health in local areas

Method used

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  • A convenient and small near-surface atmospheric boundary layer wind tunnel and its application in population risk exposure assessment
  • A convenient and small near-surface atmospheric boundary layer wind tunnel and its application in population risk exposure assessment
  • A convenient and small near-surface atmospheric boundary layer wind tunnel and its application in population risk exposure assessment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 It is a top view of the convenient and small near-surface atmospheric boundary layer wind tunnel structure of the present invention. Among them, the pipeline fan 1, the swirl air mixing pipe 2, the diffuser 3, the natural wind injection device 4, the simulation test device 5, the backflow stabilization device 6, the first elbow pipe 7, the induced air pipe 8, the second bend Head pipe 9, return air pipe 10, reducing pipe 11, third elbow pipe 12, exhaust box 13, sampling hole 14, sampling hole 15, cyclone distribution pipe 16, is the air flow direction.

[0031] The near-ground atmospheric boundary layer wind tunnel of the present invention comprises a wind tunnel main body and a backflow stabilization device 6; the wind tunnel main body is provided with a natural wind injection device 4 and a simulation test device 5, and the natural wind injection device 4 and the simulation test device 5 and backflow stabilizing device 6 are connected in sequence; the natu...

Embodiment 2

[0042] A convenient and small near-surface atmospheric boundary layer wind tunnel, such as image 3 shown, with figure 1 In addition to the same structure as described above, an inner member 17 that prevents flow separation is provided in the diffuser 3; The central position in the diffuser 3 is to ensure that the air intake conditions of the simulated test device are consistent; the swirl air mixing pipe 2 is provided with multiple groups of static mixing spiral rods 18, and the static mixing spiral rods 18 are spiral The strips are bundled and welded on the inner wall surface of the swirling air mixing pipe 2, so that the concentration, speed and flow pattern of the pseudo-natural wind can be uniform and stable. According to the wind speed simulation results of the inlet pipe in the wind tunnel test section, the natural wind field of the wind tunnel is measured at a wind speed of 1.5m / s after the wind speed stability evaluation. The data collection points are distributed at...

Embodiment 3

[0045] based on Figure 5 As shown in the wind tunnel structure, the data collection points are distributed at points s4, s5 and s6 of the sampling hole 15. The humidity of the experimental test is set to 90% RH, the wind speed is 3.3m / s, and the wind direction is N. In the terrain model, the data The collection point s4 is the center, and calabash moss is arranged in a circular area with a diameter of 0.1m around it. There is a sampling hole in the terrain model in the wind tunnel, and the sampling hole 14 is located in the industrial area of ​​the terrain model, the hole shape is circular, and the hole cross-sectional area is 0.1m 2 , the inlet velocity of the injection hole is 0.5m / s, and the injection component is 300μg / m 3 Xylene-atmospheric mixed gas. The wind tunnel diffusion flow equalization device is provided with an umbrella-shaped internal member 17, and a static mixing spiral rod 18 made of silicon carbide is installed in the swirling air mixing pipe. The mass ...

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Abstract

A convenient and small near-ground atmospheric boundary layer wind tunnel and use thereof in the evaluation of population risk exposure. The near-ground atmospheric boundary layer wind tunnel comprises a wind tunnel body and a backflow stabilization device (6); the wind tunnel body is provided with a natural wind injection device (4) and a simulation test device (5), the natural wind injection device (4) is connected to the simulation test device (5), and the simulation test device (5) is connected to the backflow stabilization device (6); the natural wind injection device (4) is provided with a pipeline fan (1), a rotational flow mixing pipe (2), a diffusion and flow equalizing device (3) and a cyclone distribution pipe (16) which are connected in sequence; an inner member (17) for preventing flow separation is provided at a central position in the diffusion and flow equalizing device (3); and a static mixing spiral rod (18) is provided in the rotational flow mixing pipe (2), the static mixing spiral rod (18) being welded on an inner wall surface of the rotational flow mixing pipe (2). The measurement of the wind tunnel to an environmental migration and transformation behavior of atmospheric pollutants reduces the occupied area of the wind tunnel, reduces the investments, and can solve the problems of an environmental migration and transformation process of near-ground layer air pollutants in a local region and the evaluation of the influence thereof on the population health.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel device design and construction, diffusion and risk exposure assessment methods, and more specifically relates to a convenient and small near-surface atmospheric boundary layer wind tunnel and its application in crowd risk exposure assessment. Background technique [0002] At present, the mainstream wind tunnels are large-scale, and the design and construction of large-scale wind tunnels are mostly required for aerodynamic tests, and the test process is complicated; and the wind tunnels are generally straight, with honeycombs installed inside, covering a large area. Construction costs are high. [0003] Since the flow field in the wind tunnel near the surface boundary layer will affect the migration and transformation characteristics of air pollutants, especially under the influence of complex factors, such as terrain, source emissions, climate and meteorology, the environmental migration and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/02G01M9/08G01M9/04
CPCG01M9/02G01M9/04G01M9/08
Inventor 安太成张婷李桂英王祖明
Owner GUANGDONG UNIV OF TECH
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